-
T. Tajima, V. Malka (EPS 2019)08/07/2019, 09:40ALFVÉN PRIZE LECTURE
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.001.pdfThe concept of laser plasma accelerators has been proposed by T. Tajima and Dawson in 1979. Through nonlinear theory and PIC simulations it was shown than GV/cm accelerating field should be produced when intense laser pulse interacts with an underdense plasma in the laser wakefield or in laser beat-wave regime. Since...
Go to contribution page -
P. Mantica (EPS 2019)08/07/2019, 10:45MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.002.pdfFusion performance in tokamaks depends on the core and edge regions as well as on their nonlinear feedbacks. The achievable degree of edge confinement under the constraints of power handling in presence of a metallic wall is still an open question. Therefore, any improvement in the core temperature and density peaking...
Go to contribution page -
J. Egedal (EPS 2019)08/07/2019, 11:20BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.003.pdfThe newly developed Terrestrial Reconnection Experiment (TREX) [1] in the Wisconsin Plasma Physics Laboratory (WiPPL) [2] is optimized to study magnetic reconnection in a regime where Coulomb collisions between electrons and ions are sufficiently infrequent that kinetic effects in the electron dynamics are retained...
Go to contribution page -
J. Benedikt (EPS 2019)08/07/2019, 11:55LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.004.pdfAtmospheric pressure non-equilibrium plasmas are effective source of large densities of reactive radicals, metastables and ions and also high fluxes of photons with wavelengths down to the vacuum UV range. The resulting high reactivity of these APPs can be used in many surface treatment applications such as activation...
Go to contribution page -
L. Askinazi (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1001.pdfIon cyclotron emission (ICE) in tokamak plasmas has recently become a subject of enhanced interest due to their potent capability to be used as a diagnostic tool for fast ion and charged fusion product confinement characterization. At the TUMAN-3M tokamak, ICE is observed both in ohmic and NBI heated plasma. In...
Go to contribution page -
R. Dux (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1002.pdfThe knowledge of the current density in the pedestal region of H-mode plasmas is important to understand the stability of the pedestal with respect to edge localised modes (ELMs). The current density is connected to the poloidal magnetic field Bp via AmpËres law, which can be determined by an accurate measurement of...
Go to contribution page -
T. Fan (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1003.pdfMeasurements of fusion neutron spectrometry is one of the important diagnostics in EAST, with DD neutron yield from 10^9 to 10^15 n/s for deuterium plasma discharges with neutral beam injection, lower hybrid waves, ion cyclotron resonance frequency heating and their combination. A suite of compact neutron...
Go to contribution page -
G. Castro (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1004.pdfAxis-symmetric magnetic traps have been used for decades asion sourcesfor accelerators. Recent searches, however, revealed that plasma generated in compact traps is also a surprising environment for studies of nuclear astrophysics, includingnuclear beta-decays andplasma instabilities connected to ...
Go to contribution page -
N. Tamura (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1005.pdfThe tracer-encapsulated solid pellet (TESPEL), which can be considered as an impurity-embedded hollow pellet, was developed at NIFS, Japan to promote detailed impurity transport studies in magnetically-confined high-temperature plasmas [1]. Recently, a TESPEL injection system has been commissioned on the Wendelstein...
Go to contribution page -
A. Gurchenko (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1006.pdfConsiderable interest in radial fluctuations of plasma velocity is associated with their significant role in the formation of turbulent radial flows. In this paper we implement the new microwave technique - the equatorial enhanced scattering (EES) [1], possessing the submillimetre spatial radial resolution and...
Go to contribution page -
N. Lemoine (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1007.pdfThe growing capabilities (speed, sensitivity, dynamic range) of fast visible cameras make this tool more and more interesting for diagnosing turbulence in plasma devices, and in particular,
Go to contribution page
in fusion ones. Especially, cameras' speed is approaching probe acquisition frequencies while they usually reach higher spatial... -
B. Shukla (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1008.pdfThe EC assisted low-loop voltage plasma start-up experiments have been carried in Tokamak ADITYA-U. The 42GHz ECRH system is used for off-axis breakdown in tokamak, which is operated at a toroidal magnetic field of ~ 1.2T. The EC power in fundamental O-mode is launched from low ...
Go to contribution page -
J. Ayllon-Guerola (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1009.pdfThe JT-60SA tokamak will be able to operate in scenarios with large fraction of fast-ion pressure. The fast-ion population with supra-alfvenic velocities is expected to play an important role in the stability of magnetohydrodynamic (MHD) fluctuations, in particular of the Alfven Eigenmodes (AEs). Direct wave-particle...
Go to contribution page -
M. Baruzzo (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1010.pdfThe Divertor Tokamak Test (DTT) is a new tokamak device whose main mission is to explore innovative divertor concepts for DEMO and test them in heat loads conditions on plasma facing components relevant to a fusion reactor. The device is presently going through a detailed design process, and the tendering process has...
Go to contribution page -
F. Causa (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1011.pdfThe expulsion of runaway electrons (REs) in the presence of magnetic islands is studied for different island dynamics and different RE population fraction. Clear correlations are found between magnetic island size and RE diagnostics, in particular hard x-ray emission and a single-channel Cherenkov probe placed in the...
Go to contribution page -
M. Chernyshova (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1012.pdfJT-60SA is a fusion experiment designed to support the operation of ITER and to investigate how best to optimize the operation of future fusion power plants. For the safe operation of the device, a survey spectrometer observing the plasma from an equatorial port is foreseen to monitor light impurities such as carbon...
Go to contribution page -
S. Coda (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1013.pdfThis contribution will present a feasibility study and conceptual design of a tangential phasecontrast imaging (PCI) diagnostic for the new JT60SA tokamak. PCI is a well known technique for measuring density fluctuations. Tangential launching, combined with an appropriate spatial filtering technique, affords the...
Go to contribution page -
K. Crombe (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1014.pdfThe overall goal of the IShTAR (Ion Cyclotron Sheath Test ARrangement) project is studying antenna near-fields in the presence of a plasma and magnetic field to assess theoretical predictions on RF sheaths and to guide theoretical modelling [1]. For antenna studies it is favourable to operate at tokamak edge-like...
Go to contribution page -
A. Dal Molin (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1015.pdfThe production of relativistic runaway electrons during disruptions can potentially compromise the integrity of plasma-facing-components in large tokamaks. In ITER up to 70% of the initial plasma current can be converted into relativistic runaway current. The energy content of such runaway electron beam can reach...
Go to contribution page -
P. Dhyani (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1016.pdfRepeatable discharges with high loop voltage and low-density in GOLEM tokamak [1] present good experimental conditions for the study of runaway electrons (RE). A probe is being designed and developed for the spectral measurement [2] of RE energy inside and near the GOLEM tokamak plasma edge. Probe design is based on...
Go to contribution page -
J. Galdon-Quiroga (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1017.pdfA new diagnostic - the imaging heavy ion beam probe (i-HIBP) [1] - for the simultaneous measurement of plasma potential, magnetic field and density fluctuations is being developed at the ASDEX Upgrade tokamak. A neutral beam of heavy atoms is injected into the plasma at energies around 70 keV. As the neutral primary...
Go to contribution page -
E. Ghorbanpour (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1018.pdfExperimental investigation of magnetised plasma turbulence is actively pursued in fusion aimed as well as in basic plasma physics toroidal devices. In particular the understanding of turbulent transport mechanisms has a great interest for the improvement of the magnetic confinement. Here we discuss the use of...
Go to contribution page -
D. Gradic (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1019.pdfThe new Doppler Coherence Imaging Spectroscopy (CIS) system from Wendelstein 7-X (W7X) [1] is temporarily installed at ASDEX Upgrade (AUG) for a first extensive investigation of puffed nitrogen flows in the SOL and divertor. CIS is a powerful tool to measure 2D images of line-integrated, emission-weighted impurity ion...
Go to contribution page -
P. Hacek (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1020.pdfRecently, the Lithium Beam Emission Spectroscopy (Li-BES) system [1,2] on the COMPASS tokamak has reached its full diagnostic capabilities. It is used for routine automatic measurements in a majority of COMPASS discharges and serves as a standard tool for reconstruction of fast (up to 2 s) density profiles in the edge...
Go to contribution page -
I.A. Khodunov (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1021.pdfThis work discusses first results of ne and Te measurements on Globus-M2 obtained with the upgraded Thomson scattering (TS) diagnostics. Globus-M2 is spherical tokamak with the following parameters R = 0.36m, r = 0.24m, Ip < 500 kA which differs from Globus-M by a two times higher magnetic field reaching 1 T. The...
Go to contribution page -
M. Kim (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1022.pdfA high-speed broad-band (0.1-5 GHz) RF spectroscopy system has been developed to study the wave phenomena associated with the collapse of edge confinement barrier (called pedestal) in the KSTAR tokamak. In the early measurements using the dipole-type antennas (<1 GHz), the collapse always coincided with intense and...
Go to contribution page -
O.L. Krutkin (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1023.pdfTurbulent transport plays a key role in plasma confinement, which makes understanding and control of plasma turbulence one of the major goals of fusion research. The tools for turbulence characterization include Doppler reflectometry (DR) and radial correlation Doppler reflectometry (RCDR) [1], latter of which...
Go to contribution page -
H. Hezaveh Hesar Maskan (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1024.pdfIn magnetic fusion devices, unstable Alfvén eigenmodes (AEs) may lead to frequency sweeping events and enhanced particle transport. Refs. [1, 2] explain the frequency sweeping events in terms of evolution of coherent structures, namely holes and clumps, in the energetic particles (EPs) phase-space using a perturbative...
Go to contribution page -
W. Chen (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1025.pdfThe nonlinear dynamics of shear Alfvénic wave fluctuations have become a major concern in magnetically confined fusion, since they can be driven unstable by energetic particles (EPs). There are two routes for the Alfvénic fluctuation nonlinear dynamic evolution, with one corresponding to wave-particle phase space...
Go to contribution page -
B. Madsen (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1026.pdfFast-ion velocity-space tomography enables reconstruction of the 2D fast-ion velocity distribution from a set of 1D measurements. Here, we reconstruct for the first time the fast-ion velocity distribution for plasmas with high and low Alfvén eigenmode (AE) activity using the 4-view fast-ion D-alpha (FIDA) diagnostics...
Go to contribution page -
F. Cianfrani (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1027.pdfAlpha channelling is a mechanism to transfer the power associated with the fusion-generated alpha particles to the thermal ions through the interaction with an externally excited Ion Bernstein Wave (IBW) that absorbs the alpha particle energy associated with the perpendicular motion. The extraction of energy is...
Go to contribution page -
M. Koleva (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1028.pdfAccurate measurements of the neutron emission in fusion plasmas are a prerequisite for the performance of present and future fusion devices mainly due to the role neutrons play in the fusion rate estimation. In addition, neutrons serve as an imprint of the fast ions content and dynamics, which can be detrimental to...
Go to contribution page -
Z. Wang (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1029.pdfThe strength of neoclassical toroidal viscosity (NTV) induced by energetic particles (EPs) is investigated with DIII-D experiments and MARS-K simulations [1]. Tokamak plasma confinement is sensitive to a low level of intrinsically existing or externally applied threedimensional (3-D) magnetic field perturbations....
Go to contribution page -
L. Yu (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1030.pdfThe neoclassical tearing mode (NTM) can result in a large amount of fast ion loss. A correlation between the frequency and the phase of the mode and those of the losses was observed with the diagnosis systems, i.e. the Mirnov coils and the fast ion losses detector (FILD), which explicitly showed that the NTM could...
Go to contribution page -
D. Brunetti (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1031.pdfTokamak high-confinement regimes are normally affected by the presence of often violent edge localised modes (ELMs). ELMs deposit unacceptable peak heat loads causing a severe deterioration of the plasma facing components. Thus a vivid interest has arisen on the development of naturally ELM-free regimes. One of the...
Go to contribution page -
L. Chôné (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1032.pdfThe tokamak boundary is of central importance for controlled magnetic fusion. It regroups critical technological and scientific challenges that hold the key to achieving and sustaining ignition [1-4]. This includes plasma-surface interaction which submits the material wall to extreme fluence during long pulses, heat...
Go to contribution page -
Y. Chao (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1033.pdfNeutral beam injection (NBI) system has been proved to affect sawtooth activities through both producing energetic particles and supplying torque applied to the plasma. The impact of NBI on sawtooth crashes has been studied in the EAST tokamak, which is equipped with co- and counter NBIs. Statistical analysis shows...
Go to contribution page -
Y.M. Duan (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1004.pdfIn tokamak plasma, disruptions are dangerous events for device safety due to the large energy loss in very short time. Plasma disruption mitigation by massive gas injection (MGI) is an effective heat dissipation method through high radiation [1-3]. The MGI disruption experiments are researched with noble Helium (He)...
Go to contribution page -
S. Futatani (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1035.pdfNon-linear MHD simulations of pellet-triggered ELMs in JET plasma have been carried out with the JOREK code [1, 2, 3]. The pellet particle fueling efficiency and the power flux at the divertor target during the pellet-triggered ELM have been studied. The understanding of the ELM mitigation is more important in the...
Go to contribution page -
W. Guo (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1036.pdfDouble tearing mode (DTM) is an important kind of magnetohydrodynamics (MHD) instability that often occurs with reversed central magnetic shear configuration in tokamak discharges. A 5th order Weighted Essentially Non-Oscillatory (WENO) scheme is applied to build up a new numerical nonlinear MHD code based on a...
Go to contribution page -
A. H. Boozer (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1037.pdfThe ideal evolution equation, ∂B/∂t =curl×(u⊥×B),implies magnetic field lines move with a velocity u⊥and cannot change their connections. Nevertheless, for an electric field that is arbitrarily close to the ideal form, E +u⊥×B= -grad Φ,magnetic connections will in general break on a time scale τ, where...
Go to contribution page -
M. Francisquez (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1038 .pdfHelical magnetic field devices, such as the Helimak (University of Texas) and TORPEX (EPFL), provide a useful environment for refining our understanding of open fieldline toroidal systems and testing both new and old codes. These devices have important ingredients of tokamak scrape-off-layer turbulence: parallel...
Go to contribution page -
Z. Qiu (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1039.pdfShear Alfvén wave instabilities such as toroidal Alfvén eigenmode (TAE) are expected to play important roles in magnetic confinement fusion devices as energetic particles (EPs) contribute significantly to the total power density. TAE can be driven unstable by EPs, and in turn, induce EP transport and degrade overall...
Go to contribution page -
P. Rodrigues (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1040.pdfMagnetic equilibria are fundamental to almost every phenomena in tokamak plasmas, but accurate numerical solutions of the Grad-Shafranov (GS) equation are not always the best tool to gain insight into such complex processes. Simplified local descriptions, like the s - alpha model with circular magnetic surfaces [1] or...
Go to contribution page -
S.A. Sabbagh (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1041.pdfDisruption prediction and avoidance is critical in ITER and reactor-scale tokamaks to maintain steady plasma operation and to avoid damage to device components. The present status and results from the physics-based disruption event characterization and forecasting (DECAF) research effort are shown for multiple tokamak...
Go to contribution page -
P. Savrukhin (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1042.pdfDevelopment of the arc discharges in the peripheral plasma is considered as a possible mechanism determining transition from relatively slow growth of the large-scale MHD perturbations to thermal quench (minor disruption) and subsequent transition to a major disruption (current collapse). Development of the arc...
Go to contribution page -
L. Xu (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1043.pdfThe rapid sawtooth crash without magnetic reconnection during crash phase is a longdebated issue in fusion plasma. In relatively high central beta plasma, nonlinear simulation with the extended MHD code predicted that it is unstable to a new type of instability over q=1, a nonlinear ideal-MHD unstable mode with...
Go to contribution page -
L. Zeng (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1044.pdfPlasmas with a high runaway electron (RE) current fraction, fRE > 0.5, have been achieved during the flat-top of EAST Ohmic discharges with both a circular limited and an X-point diverted configuration. The RE current fraction and the energy distribution are characterized stably and independent of plasma current and...
Go to contribution page -
L. Delgado-Aparicio (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1045.pdfDetailed properties of the 3D structure of (1/1) internal kinks can be accessed using a modern suite of spectroscopic imaging diagnostics. A combination of high time- and space-resolved 1D measurements of electron density and temperature fluctuations together with local 2D soft x-ray (SXR) radiated power density...
Go to contribution page -
N. Dubuit (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1046.pdfNeoclassical tearing modes (NTM) are metastable magnetic islands in tokamaks; however, they appear frequently in experiments without any noticeable triggering event. In order to understand this, it has been numerically shown that turbulence can create a seed island by mode coupling [1, 2, 3], even remotely [4] ; such...
Go to contribution page -
M. Becoulet (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1047.pdfAt present, the intensive experimental and theoretical studies of Edge Localized Modes (ELMs) physics are particularly oriented towards finding the methods of their control in ITER. ELMs potentially represent an issue for ITER divertor lifetime due to large transient heat and particle losses released in each ELM...
Go to contribution page -
T. Bolzonella (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1048.pdfThe Reversed Field Pinch (RFP) configuration is often characterized by a wide spectrum of unstable tearing modes (TMs) involved in the generation and sustainment of the magnetic field in the plasma. This dynamo process is heavily influenced also by other processes or parameters like intrinsic plasma flow (no external...
Go to contribution page -
D. Bonfiglio (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1049.pdfThe reversed-field pinch (RFP) is a configuration for the magnetic confinement of fusion plasmas, in which most of the toroidal field is generated by the plasma itself through a self-organized dynamo process, instead of being produced by external coils as in the tokamak. In the RFP, the nonlinear saturation of...
Go to contribution page -
C. B. Kim (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1050.pdfKnowledge of the cross phases between the fluctuations is crucial in the turbulent transport of the plasma particles and the thermal energy. The cross phase plays an important role in the determination of the turbulence level because the fluctuations in the drift plasma turbulence are driven by the turbulent fluxes...
Go to contribution page -
G. Bustos Ramirez (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1051.pdfQuiescent H-mode (QH-mode) operation is highly desirable relative to the well known Hmode operation because it allows for high energy density in the core as well as potentially improved confinement of energy and particles. A feature of QH-mode is that the Edge Localized Mode (ELM) instabilities are replaced with...
Go to contribution page -
R. Cavazzana (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1052.pdfA four-terminal electrical network formulation for the Reversed Field Pinch (RFP) is derived, fixing the flaws of the similar models available in the past literature [1][2]. The approach used in those papers starts from a specific plasma description, and the four electrical quantities of interest (toroidal loop...
Go to contribution page -
F. Cella (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1053.pdfExperimentally it is observed that modes at frequency lower than toroidicity-induced Alfvén eigenmodes (TAEs) could enhance the loss of circulating ions injected in the plasma by the heating system, degrading the plasma confinement [1]. These low frequency modes can be identified with beta-induced Alfvén-acoustic...
Go to contribution page -
S. Diem (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1055.pdfM3D-C1, a code for solving the linear and non-linear extended-MHD equations in toroidal geometry, is currently being used to model pellet ELM triggering in DIII-D ITER-like plasmas. Large edge localized modes (ELMs) in magnetically confined plasmas can lead to the sudden release of thermal and magnetic stored energy...
Go to contribution page -
S.N. Gerasimov (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1056.pdfAn n = 1 locked, or slowly rotating, mode has been observed in most pulses prior to JET disruptions. However, a small fraction of non-disruptive pulses has a locked mode which eventually vanishes without disruption. Despite these exceptions the locked mode amplitude is routinely used as a trigger for the JET...
Go to contribution page -
M. Gobbin (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1057.pdfThe application of 3D fields might help in preventing and mitigating the avalanche generation of runaway electrons (RE) during disruption events in controlled fusion devices [1, 2]. The
Go to contribution page
successful results recently obtained in ASDEX Upgrade [3] have motivated new experiments with this technique also in the COMPASS... -
A. Gude (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1058.pdfTearing modes (TMs) are a major concern for tokamak operation. Especially a (m = 2, n = 1) TM (with m poloidal and n toroidal mode number) can cause strong confinement reduction and also initiate a disruption.
Go to contribution page
When modes with the same toroidal but different poloidal mode numbers are phase locked, the local phase... -
G. Huijsmans (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1059.pdfITER plasmas will be characterized by a high density plasma (i.e. Greenwald fraction) at low collisionality inside the separatrix, a high density in the scrape-off layer combined with a high recycling detached divertor. ELMs in ITER are expected to be tolerable at low plasma current but need to be controlled at the...
Go to contribution page -
K. Imada (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1060.pdfFor successful operation of future tokamaks such as ITER, it is paramount that we control neoclassical tearing modes (NTMs): plasma instabilities characterised by the evolution of magnetic islands. Experimentally, a sufficiently small island (comparable in width to the ion banana width, rho_bi) can heal itself and...
Go to contribution page -
N. Ivanov (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1061.pdfThe rotation of a magnetic island chain in tokamak plasma can be affected by both the electromagnetic and viscous torques applied to the resonant plasma layer that is occupied by the magnetic islands. In the presence of a static Resonant Magnetic Perturbation (RMP), in particular an Error Field, the rotation is...
Go to contribution page -
L. Simons (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1062.pdfSafely achieving the goal of stable power production in magnetic confinement fusion devices is critically dependent on controlling the mobilization and accumulation of dust[1]. The aggregation of high Z impurities in the core plasma from the ablation of metal dust grains causes strong bremstrahhlung losses[2] and can...
Go to contribution page -
I. Be'ery (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1063.pdfThe achievable gain in magnetic mirrors fusion machines is limited by particles and energy flux through the mirrors. The moving multiple mirrors (MMM) concept is based on many mirror coils at each end of the trap, synchronized in sequence to generate magnetic mirror that moves towards the centre of the trap. Particles...
Go to contribution page -
K. Hallatschek (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1064.pdfIt is highly desirable to find a common regime of validity for gyrokinetic and Braginskii fluid codes, which would give us a handle to extend the regime of validity of either to the very edge and H-mode transition conditions. Up to now the highly nonlinear conditions there are more naturally the domain of fluid codes,...
Go to contribution page -
F.D. Halpern (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1065.pdfWe construct fluid plasma models that combine physical consistency and numerical stability with a simple and flexible implementation [1]. This is achieved by exploiting the anti-symmetric property of the plasma flow operator, ∫dVφ(∇·v+v·∇)ψ=−∫dVψ(∇·v+v·∇)φ, which results in exact conservation. Since this expression...
Go to contribution page -
D.S. Leontyev (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1066.pdfThe heavy ions quasicontinuum (in the 4-8 nm spectral range) presently was observed on many modern thermonuclear installations. In particular it could be used for monitoring the tungsten transport. The statistical modeling of heavy ions is proposed to describe general features of these spectra. It considers the ions...
Go to contribution page -
L. Laguardia (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1067.pdfA joint experimental/theoretical investigation on the characteristics of plasmas produced in GyM magnetic linear device [1] has been carried out, comparing the measured electron energy distribution function (EEDF) with the distribution resulting from a self-consistent state-to-state kinetic model coupling the...
Go to contribution page -
P. Macha (EPS 2019)08/07/2019, 14:00MCF
See the full abstract:
here http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1068.pdfThe GOLEM tokamak is the oldest still operational experimental device in the high temperature tokamak plasma physics. Currently its main mission is to be an educational device to train future thermonuclear fusion specialists. The GOLEM is unique thanks to its remote-control system [1], which allows to carry out the...
Go to contribution page -
E. Emdee (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1069.pdfThe surface heat flux in a fusion Demonstration power reactor operating under attached conditions has been predicted to reach values far beyond the capabilities of any solid surface [1]. The injection of gaseous impurities to cause divertor detachment can result in strong radiation at the X-point [3], causing the...
Go to contribution page -
M. Knolker (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1070.pdfType I-ELM heat loads are of great concern for ITER and future power plants as they can lead to divertor erosion and melting. Investigation of the nonlinear ELM phase and its dynamics is indispensable for progress on ELM control and understanding. An additional driver providing explosive growth in the nonlinear ELM...
Go to contribution page -
N. Bertelli (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1071.pdfRecent modelling and experimental studies [1-4] show that the edge density fluctuations can affect the electron cyclotron (EC) wave propagation in a tokamak plasma. In particular, the presence of density fluctuations in the scrape-off layer (SOL) can modify the EC beam propagation causing a power deposition...
Go to contribution page -
T. Carter (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1072.pdfThe Basic Plasma Science Facility (BaPSF) at UCLA is a US national user facility for studies of fundamental processes in magnetized plasmas. The centerpiece of the facility is the Large Plasma Device (LAPD), a 20m long, magnetized linear plasma device [1]. This LAPD has been utilized to study a number of fundamental...
Go to contribution page -
M. Cavenago (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1073.pdfNegative ion sources are a critical component of neutral beam injectors NBI (used for stellarator and tokamak heating and current drive), due to the stringent requirement current density, beam divergence and operational stability. In support to the NBI development, a relatively compact 9 beamlet H- source (named...
Go to contribution page -
U. Fantz (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1074.pdfThe test facility ELISE represents a 1/2-size scaled experiment for the development of the RF-driven negative hydrogen ion source of the ITER neutral beam injection (NBI) systems. ELISE is dedicated to demonstrate the ITER requirements in terms of extracted negative hydrogen current densities (329 A/m^2 H-, 286 A/m^2...
Go to contribution page -
S.K. Hansen (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1075.pdfParametric decay instabilities (PDIs) are phenomena in which a large-amplitude pump wave decays to two lower-frequency daughter waves once its amplitude exceeds a nonlinear threshold. PDIs are ubiquitous in situations where plasmas interact with strong waves, including ionospheric modification experiments and wave...
Go to contribution page -
D.A. Hartmann (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1076.pdfIn the recent experimental campaign of W7-X, a neutral beam injection (NBI) system was put into operation for the first time. This system is in many parts identical to the system on AUG. It consists of two injectors, NI21 and NI20, that can accommodate up to four radio-frequency driven ion sources. The acceleration...
Go to contribution page -
J.L. Velasco (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1077.pdfAn efficient fuelling capability is mandatory for large fusion devices; this being of primary importance for helical devices [1]. The injection of cryogenic pellets is the best candidate to refuel the plasma core in large devices. During the past decades pellet injection (PI) technologies have become well developed...
Go to contribution page -
R.I. Pinsker (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1078.pdfTwo high-power systems for non-inductive current drive in the mid-radius region with waves in the lower hybrid range of frequencies (LHRF) are under construction for the DIII-D tokamak. One system will launch fast waves at 0.48 GHz ('helicons') from a 30-element traveling wave antenna of the comb-line type mounted...
Go to contribution page -
A. Popov (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1079.pdfThe electron cyclotron resonance heating (ECRH) is widely used in the toroidal devices and planned for application in ITER. Its concept is based on the linear theory. However, during the last decade the anomalous scattering of pump microwaves was discovered in presence of a non-monotonic density profile in the...
Go to contribution page -
S.J. Wukitch (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1080.pdfHigh field side lower hybrid current drive (HFS LHCD) has potential to provide efficient off-axis current drive consistent with advanced tokamak (AT) scenarios via improved wave accessibility and penetration.[1] Due to the quiescent HFS scrape off layer, HFS LHCD has potentially dramatically reduced plasma material...
Go to contribution page -
G.L. Falchetto (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1081.pdfMulti-tokamak analysis and modelling is performed within the EUROfusion Integrated Modelling (EU-IM) framework [1], backbone to the Integrated Modelling and Analysis Suite (IMAS)[2], which offer unique capabilities by providing device agnostic integrated simulation workflows, encompassing interchangeable physics...
Go to contribution page -
G. Fuchert (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1082.pdfOne of the main goals of Wendelstein 7-X is to show that stellarators can sustain fusion-relevant plasma conditions in steady-state. It is envisaged to demonstrate plasma operation with a density well above 10^20/m^3, central electron and ion temperatures around 3 keV and a pulse length of half an hour. Finding a...
Go to contribution page -
M. Honda (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1083.pdfThe steady-state transport equation solver, GOTRESS, has been developed, which directly finds the solution where a transport flux matches an integrated source using global optimization techniques such as a genetic algorithm and Nelder-Mead method [M. Honda, Comput. Phys. Commun. 231 (2018) 94.], given an equilibrium...
Go to contribution page -
E. Schuster (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1084.pdfOne of the most fundamental control problems arising in ITER and future burning-plasma tokamaks is the regulation of the plasma temperature and density to produce a determined amount of fusion power while avoiding undesired transients. ITER is designed to achieve a ratio of fusion power to auxiliary power, Q, of 10....
Go to contribution page -
R. Kube (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1085.pdfFluctuations in the scrape-off layer of Alcator C-Mod have been investigated by gas puff imaging and mirror Langmuir probe measurements, including L, H and I-mode plasmas. In all cases, the time series from the far scrape-off layer region are dominated by large-amplitude bursts attributed to the radially outwards...
Go to contribution page -
M. Hamed (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1086.pdfIn H-mode plasmas, the modelling of the pedestal dynamics is an important issue to predict temperature and density profiles in the tokamak edge and therefore in the core. The model EPED [1] , based on the stability of large and small scales MagnetoHydroDynamic (MHD) modes, is most commonly used to characterize the...
Go to contribution page -
Y. Liu (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1087.pdfOne of the most provocative phenomenons in plasma transport is the so called non-local heat transport: the core temperature increases in response to edge cooling. This was observed for the first time in the TEXT experiment in 1995, and was reproduced in many tokamaks (TFTR, Tore Supra, RTP, ASDEX-U, JET, HL-2A,...
Go to contribution page -
L. Schmitz (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1088.pdfIt is shown that stochastic edge magnetic field topology with applied resonant magnetic perturbations can explain the increased L-H power threshold with applied n=2 resonant magnetic perturbations (RMP) in low rotation, ITER-similar-shape plasmas in DIII-D (<ne>=1.5-5x10^19m^-3, Bt=1.9-2T, Ip=1.5 MA, q95~3.6). With...
Go to contribution page -
K.L. van de Plassche (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1089.pdfAccurate prediction of turbulent transport is essential for interpretation of current-day fusion experiments, designing future devices, and optimization of plasma scenarios. Turbulent transport in the core of the plasma is well-described by quasilinear theory, which can be leveraged to create reduced models. These...
Go to contribution page -
W. Zhong (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1090.pdfFor future fusion devices, like ITER, controllable L-H transition and reducing the power threshold are highly desirable when the available heating power is marginal for accessing the H-mode. Theoretic models have predicted that the L-H transition can be triggered by particle injection below the threshold (P < Pth)...
Go to contribution page -
A. Bierwage (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1091.pdfExisting methods for diagnostics and control are still insufficient to deal with the various kinds of instabilities and collective dynamics that occur in magnetically confined fusion plasmas, which may impact the missions of the ITER and DEMO projects. Using small-scale laser experiments on the J-KAREN-P laser at...
Go to contribution page -
G. Fogaccia (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1092.pdfHYMAGYC [1] is a HYbrid MAgnetohydrodynamycs GYrokinetic Code suitable to study the interaction between energetic particles (EPs) and Alfvénic modes. Thermal plasma is described as a single fluid by fully resistive linear MHD equations, while EPs are described by nonlinear gyrokinetic Vlasov equations [2]. In this...
Go to contribution page -
B. Hong (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1093.pdfAn optimal radial build and system parameters of a tokamak reactor were found by utilizing a new simulation method which couples a conventional tokamak plasma analysis and a radiation transport analysis. Neutron impacts on shielding and tritium breeding capability were self-consistently incorporated, together with...
Go to contribution page -
R. Nazikian (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1094.pdfMeasurements and modeling of DIII-D low collisionality (v*e~0.1-0.3) plasmas reveal pedestal-top locked modes as the probable trigger for Edge-Localized-Mode (ELM) suppression by n=2 and n=3 Resonant Magnetic Perturbations (RMPs) in a range of plasma conditions including neutral beam torque 3 - 6 Nm, plasma average...
Go to contribution page -
M. Porkolab (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1095.pdfThe resonant detection and measurement of the damping rates of Alfvén Eigenmodes (AEs) is of critical importance to the design of experiments and development of models of AE stability [1]. With the Alfvén Eigenmodes Active Diagnostic (AEAD) on JET, weakly-damped Toroidal AEs (TAEs) have been probed. Theoretical...
Go to contribution page -
A. A. Martynov (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1096.pdfThe sideways forces acting on the conducting wall due to the n=1 kink instability are investigated. During the early phase of the disruption the plasma is considered to be isolated from the wall and halo currents do not appear. The plasma with minor radius of 1 m and almost circular shape with a large current (> 5...
Go to contribution page -
A. Pandey (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1097.pdfLarge-scale fusion reactors like ITER are going to require very high-energy neutral beams (>1MeV) for plasma heating purposes as well as diagnostic neutral beams. To realize this, negative ion sources are a better alternative to the conventional positive ion sources because of their higher efficiency of...
Go to contribution page -
M. Rebai (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1098.pdfIn a DT plasma the T/D fuel ion ratio represents an important parameter which is difficult to measure. In principle, it is possible to infer the T/D ratio from a direct simultaneous measurement of the neutron spectra of 2.5 MeV neutrons from D+D->He3+n and 14 MeV neutrons from the D+T->He4+n reactions, respectively....
Go to contribution page -
R. Ding (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1099.pdfThe next-step fusion facility China Fusion Engineering Test Reactor (CFETR) has been proposed to bridge the gaps between ITER and DEMO [1]. One of the most important missions for CFETR operation is tritium self-sufficiency, which is mainly determined by tritium burn-up fraction (fb) and the design of blanket and...
Go to contribution page -
R. Fischer (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1100.pdfAdjustable current and q-profile shapes are of particular interest for the development of advanced scenarios, e.g., non-inductive tokamak operation, and for testing and refining of transport models for predictive capabilities. The current profile is tailored at ASDEX Upgrade using improved heating and current-drive...
Go to contribution page -
P. Aleynikov (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1101.pdfIt has recently been demonstrated that the injection of cryogenic pellets into a magnetically confined plasma is accompanied by a considerable transfer of thermal energy from the electrons of the background plasma to the ions [1]. This is the result of the ambipolar expansion along the magnetic field line of the cold...
Go to contribution page -
N. Bosviel (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1102.pdfDetailed numerical studies of single neon pellets and multiple pellet fragments have been performed in support of the shattered pellet injection (SPI) concept for the plasma disruption mitigation system [1].
Go to contribution page
Two codes have been developed to study details of the evolution and properties of ablation clouds in the... -
C. Castaldo (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1103.pdfThe concept of alpha power channeling has been proposed by N. Fisch and collaborators as an efficient tool to improve the performance of fusion reactors, delivering the fusion alpha power into radio frequency waves, which are absorbed by ion species [1]. Alpha channeling by Doppler-shifted inverse nonlinear Landau...
Go to contribution page -
A.C. Coroado (EPS 2019)08/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.1104.pdfWe study tokamak fuelling by using a first-principles approach, based on turbulent numerical simulations of the plasma periphery. These simulations are carried out by using the GBS code [1, 2]. GBS is a 3D flux-driven turbulence code that advances the drift-reduced two-fluid Braginskii equations, while solving a...
Go to contribution page -
H. Zhang (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2001.pdfThe self-similar nonlinear evolution of the multimode ablative Rayleigh-Taylor instability (RTI) is studied numerically. It is shown that the nonlinear multimode bubble-front penetration follows the gt2 scaling law with dependent on the initial conditions and ablation velocity. It is shown that mass ablation reduces...
Go to contribution page -
L. Wang (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2002.pdfIn the ICF central ignition implosion, a spherical target is uniformly irradiated and ablatively compressed, creating the temperature and density conditions (i.e., the stagnation pressure) necessary to achieve thermonuclear ignition. Throughout the entire ICF implosions, the integrity of the compressed shell is of...
Go to contribution page -
J. Bonvalet (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2004.pdfLaser-driven ion acceleration is an attractive way to realize compact and affordable ion sources for many exciting applications including cancer therapy, proton radiography, and inertial confinement fusion. Many of these applications require high energy ion beams with narrow energy spread as well as high...
Go to contribution page -
O. Olkhovskaya (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2005.pdfWe study short-lived plasma flows during sub-microsecond Z-pinch implosion by high current facility. To fulfil multiparametric numerical simulations we use radiativemagnetohydrodynamics (RMHD) code MARPLE-3D developed in Keldysh Institute of Applied Mathematics. MARPLE is designed as an expandable full-scale...
Go to contribution page -
V.A. Flegentov (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2006.pdfLaser electron accelerators are considered as a novel high brightness x-ray source with unprecedented features such as small size and narrow divergence. These advantages make this source a promising diagnostic for variety of applications especially in radiography. For the most future applications it is necessary to...
Go to contribution page -
M. Matys (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2007.pdfWith the advent of multi-petawatt laser systems like the ELI-Beamlines (Czech Republic), APOLLON (France) and SEL (China) the laser-driven ion accelerators will enter the acceleration regimes dominated by radiation pressure [1]. High quality ion beams with low emittance and narrow energy spectrum will be generated...
Go to contribution page -
L. Ji (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2008.pdfSpin-polarized electron beams are extensively used for spin-dependent high energy physics and material science. Here we propose a new approach based on plasma wakefield acceleration (PWFA) for generating high-energy polarized electron beams. In a pre-polarized gas target, we found the restrictions to preserve the...
Go to contribution page -
J.G. Moreau (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2009.pdfThe production of laser driven protons has attracted a large number of studies thanks to their potential applications such as isochoric heating, proton radiography, isotope production or proton therapy [1]. The Target Normal Sheath Acceleration (TNSA) is the most robust and well-known generating process but it...
Go to contribution page -
A. Sundström (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2010.pdfKinetic shocks in laser-plasmas provide a promising acceleration scheme to produce highly mono-energetic ion beams [1, 2, 3]. The modeling of such setups often neglects Coulomb collisions due to the short time scales of the kinetic processes involved. However, previous results suggest at that collisions might...
Go to contribution page -
M. Watanabe (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2011.pdfThe purpose of this research is to develop a compact neutron source. Neutron can be generated by a nuclear fusion reaction. Inertia electrostatic confinement fusion (IECF) is one of the compact neutron sources by using a nuclear fusion reaction. Characteristics of the IECF are compact, monochromatic energy (2.45 MeV...
Go to contribution page -
T.C. Teter (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2012.pdfThe laser plasma undulator is a tunable device which utilizes laser plasma interaction to function as a short period undulator. Such an undulator could provide a table top solution for the production of X-ray beams which could be utilized in laboratories and medicine. In the regime of linear laser plasma interaction,...
Go to contribution page -
L. Ionel (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2013.pdfThe recent progresses made in the development of high intensity lasers open new perspectives of fundamental physics and also impacts applications from laboratory astrophysics and inertial confinement fusion to laser matter interaction in ultra-intense regimes. The interaction of high power laser pulses with a solid...
Go to contribution page -
S. Chen (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2014.pdfA paradigm model is proposed for the study of the nonstationary behavior of gyrotron backward wave oscillators. The model is first examined by comparisons with the PIC simulation, large signal theory and the linear theory for retaining the basic ingredient of formulations about the mechanism of electron cyclotron...
Go to contribution page -
N. Vvedenskii (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2015.pdfWe discuss a new method to generate few-cycle pulses from ionization of a medium by twocolor (or, more generally, multicolor) femtosecond fields [1, 2]. The method is based on the parametric excitation of a free-electron nonlinear current at the combination frequencies of ionizing pulses. In contrast to the common...
Go to contribution page -
W. Zhang (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2016.pdfWe show that high-order harmonic generation (HHG) in a solid-density target is significantly changed after an electron-positron pair plasma is produced [1], with strong and well-defined signals at harmonics of the plasma frequency (i.e., npe) present in the spectrum. The peradiation comes from the plasma wave excited...
Go to contribution page -
I. Kourakis (EPS 2019)08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2017.pdfA generalized "hybrid" Korteweg - de Vries/Burgers (hKdVB) type partial-differential equation is considered. Although the model equation is known to arise in multi-fluid plasma models treated by multiscale (so called reductive perturbation) techniques [1], its generic form is considered in this work, carrying a...
Go to contribution page -
I.I. Metelskii (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2018.pdfAnalytical theory of harmonic generation in an inhomogeneous laser-produced plasma based on the relativistic plasma resonance mechanism [1] is presented. This theory applies renormgroup symmetries method and advances known approaches beyond their applicability conditions. Relativistically strong electric fields and...
Go to contribution page -
M.G. Lobok (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2019.pdfShort laser pulse interaction with a rather dense gas plasma target may result in pulse propagation regime which maximize the charge of the high-energy electron bunches. This regime corresponds to laser pulse propagation in a self-trapping mode, where the diffraction divergence is balanced by the relativistic...
Go to contribution page -
J. Ong (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2020.pdfThe all-optical Compton backscattering setup by using laser pulses becomes a promising method in building a compact gamma-ray source [1]. Nevertheless, this method only produces a single gamma-ray flash and other sources are suppressed. In this work, we study the feasibility of producing double gamma-rays flashes by...
Go to contribution page -
A.G. Ghazaryan (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2021.pdfWith the appearance of recent X-ray free electron lasers (FEL) [1], the stimulated bremsstrahlung (SB) process of electrons on plasma ions' scattering centres may provide a sufficient energy for plasma heating at the absorption even one-two photons [2], which makes the SB as one of the effective mechanisms for laser...
Go to contribution page -
S. Krasheninnikov (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2022.pdfWe show that the proper choice of canonical variables and effective time, such that the new Hamiltonian is conserved for electrons in a dominant laser field, greatly simplifies analytical treatment of the problem. For example, for the case of counter propagating planar laser beams and dominant laser with relativistic...
Go to contribution page -
P. Raczka (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2023.pdfOne of the effects accompanying laser-target interactions at high laser intensities is the generation of strong electromagnetic pulses (EMP) with frequencies in the range of tens of MHz to few GHz. Such pulses may interfere with the electronics of the data acquisition systems and pose a threat to the safe and...
Go to contribution page -
D.R. Blackman (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2024.pdfElectromagnetic waves, while propagating through a vacuum, can carry orbital angular momentum [1] this is used in a variety of applications[2, 3]. In this study Langmuir waves carrying finite orbital angular moment are examined within a revised paraxial optics approximation. While Laguerre-Gaussian modes appear to be...
Go to contribution page -
Y. Li (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2025.pdfFast electrons are important for laser-driven x-ray sources, proton acceleration and fast ignition of the inertial confinement fusion. Fast electrons in a solid target can be diagnosed with x-ray emission, proton acceleration and optical transition radiation. However, it is quite challenge to measure their temporal...
Go to contribution page -
L. Cao (EPS 2019)08/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.2026.pdfSome kinds of tailored structured targets were proposed to enhance laser-target coupling and improve the qualities of fast electrons. When an intense propagates in a vacuum capillary, its profile is reshaped due to laser-plasma interaction near the entrance of capillary. Only the relatively low-intensity periphery of...
Go to contribution page -
I.V. Litovko (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3001.pdfThe original approach to use Hall-type plasma accelerators with closed electron drift and open walls for production converging towards axis accelerating ion beam describes here. The model in which a generalization condition of self-sustained discharge in crossed ExH fields with taking into consideration both electron...
Go to contribution page -
L. Kos (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3002.pdf -
M. Timshina (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3003.pdfNowadays capillary discharge is considered as the main way to create compact sources of EUV and soft X-ray radiation. Radiation in this range with such discharge is generated at the stage of magnetic plasma compression, when the current flowing through the system reaches values of the order of several kiloamperes....
Go to contribution page -
H. Krüger (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3004.pdfDusty plasmas with nanoparticles have attracted increased attention in the last few years. In comparison to the existing experimental setups with nanoparticles grown in the rf discharge, we present the insertion of industrial, nanoscaled Al2O3 dust with a gas jet injection setup. Beside the insertion, the...
Go to contribution page -
T. Antonova (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3005.pdfThe charge of microparticles immersed into the dc discharge of PK-4 experimental facility was estimated using the particle velocities from the experiments performed on Earth and under microgravity conditions on the International Space Station (ISS). PK-4 is an experimental laboratory developed to provide a range of...
Go to contribution page -
S.V. Ryzhkov (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3006.pdfPulsed plasma jets are often used in various technical and scientific applications and can be formed by using a capillary discharge with an evaporating wall (CDEW) [1-10]. The CDEW is a powerful pulsed plasma-dynamic discharge whose plasma is created in a dielectric cylindrical channel filled to facilitate electrical...
Go to contribution page -
M. Himpel (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3008.pdf -
J. Faltynek (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3009.pdfThe microwave plasma torch represents a class of plasma generators, important for their applications. In cases, where ethanol (typical carbon structures growth precursor) is admixed to the working gas, the environment becomes dusty, which brings known problems with plasma diagnostics (e.g. electron density cannot be...
Go to contribution page -
P.K. Srivastava (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3010.pdf -
Y. Volkova (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3011.pdfHigh-density compressed plasma flows have many applications in the field of plasma-surface interaction [1, 2]. Additionally, magnetoplasma compressors (MPCs) are among the most commonly investigated types of possible technological sources of extreme ultraviolet (EUV) radiation [3]. Previous experimental findings have...
Go to contribution page -
Y. Jung (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3012.pdfThe effects of magnetic field strength, ion mass, and non-thermal character on the dispersion properties of dust ion-cyclotron surface wave are investigated in a semi-bounded (r, q) distribution dusty plasma. In the limit of short wave number, the dispersion relation is derived by employing the specular reflection...
Go to contribution page -
K. Nilgumhang (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3013.pdfDielectric plasma discharge is used as a plasma reactor for surface modification, sterilization, germination, and ozone generation. The importance thing is plasma power controlling that is done by several ways such as voltage, frequency and pulse density of applying signal for plasma electrodes. This research is...
Go to contribution page -
M. Lee (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3014.pdfAtmospheric dielectric barrier discharge (DBD) plasma has been widely utilized in plasma bio-medicine due to generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS), etc. These produced species would affect the dielectric materials by etching of dielectric surface. Polyimide (PI) is widely...
Go to contribution page -
G. Arora (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3015.pdfWe address, the modifications in the propagation characteristics of precursor solitons due to the different sizes of the charged object. The experiments are performed in a -shaped Dusty Plasma Experimental (DPEx) [1] device where dusty plasma is created in a DC glow discharge Ar plasma using kaolin particles. A...
Go to contribution page -
K. Dzhumagulova (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3016.pdfThe elementary processes in plasma have received considerable attention in many areas of physics such as astrophysics, atmospheric science, atomic physics, molecular physics, plasma physics, and surface sciences since the excitation and ionization of atoms and molecules have provided useful structural information on...
Go to contribution page -
F. Alves Pereira (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3017.pdfSaint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, non-thermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a new case of a naturally formed such plasma, created...
Go to contribution page -
A. Melzer (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3018.pdfIn the past years the study of dusty plasmas under strong magnetic fields has gained increased interest. Dusty plasmas consist of nanometer to micrometer sized particles that acquire high negative charges due to the inflow of plasma electrons and ions. To reveal magnetization effects of the dust species high magnetic...
Go to contribution page -
A. Katorov (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3019.pdfLaser-induced discharge within a vacuum gap of few millimeters between electrodes is experimentally studied. The discharge is triggered by 1064 nm Nd:YAG laser pulses with intensities varied from 10^7 W/cm^2 to 10^9 W/cm^2 on the surface of titanium target electrode. The current formation time dependences from both...
Go to contribution page -
E. Maguid (EPS 2019)08/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3020.pdfMicrowave Pulse Compressor (MPC) is an high power microwave device designed for generation of 100's of MW's thru amplification. The amplification is based upon time compression of an initial Microwave (RF) pulse characterized by a long (µsec) duration to a short (ns) output pulse, ideally increasing the RF power by...
Go to contribution page -
A. Georgiev08/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3021.pdfWe present an experiment, based on laser induced fluorescence spectroscopy, developed to register small concentrations of atomic Tungsten and to determine its transport properties (diffu- sion coefficients) in various buffer gases. A pulsed tunable dye laser is routed through a hollow cathode where tungsten atoms are...
Go to contribution page -
D. Kennedy (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4001.pdfGyrokinetic stability of plasmas in a Z-pinch magnetic geometry is studied numerically using the GENE code [1] with a particular focus on the behaviour of "pair plasmas" consisting of positrons and electrons. Importantly, the simulations presented here are potentially applicable to dipole systems such as the upcoming...
Go to contribution page -
T. Natalia (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4002.pdfSince more than three decades, numerical simulations of fusion plasmas have undergone significant development. Nowadays, access to the High-Performance Computing facilities allows one to model realistic plasma scenarios. The questions perhaps remain open about verification and validity of the results obtained from...
Go to contribution page -
F. Del Gaudio (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4003.pdfWe show from first principles that an incoherent photon pulse traversing a plasma can excite a plasma wake via Compton scattering. We distinguish two regimes: i) the non-relativistic regime, where the incoherent photons have energy below the electron rest mass, and ii) the relativistic regime, where the incoherent...
Go to contribution page -
B. Zhang (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4004.pdfElectron radiation and gamma photon annihilation are two of the major processes in ultra-intense lasers (UIL). Understanding their behaviour in one coherence interval (CI) is the basis for UIL-matter interaction researches. However, most existing analytic formulae only give the average over many CIs. Present...
Go to contribution page -
M.R. Stoneking (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4005.pdfTheory predicts that a magnetically confined electron-positron plasma with short Debye length will be remarkably stable and exhibit unique wave physics. The APEX (A PositronElectron eXperiment) project is progressing toward an experimental realization of such a system to test some of those predictions. In this...
Go to contribution page -
R. Ekman (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4006.pdfIn both high-intensity laser-matter interactions [1-3] and astrophysical environments with very strong magnetic fields [4], it may be necessary to consider both relativistic effects and the electron spin. To this end, a kinetic model was developed recently [5], based on the FoldyWouthuysen transformation [6, 7] that...
Go to contribution page -
J. Campbell (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4007.pdfIt is estimated that a commercial aircraft will experience a lightning strike event once per year. This poses a significant risk to poorly conducting, carbon-fibre composite aircraft structures. The most widely adopted approach of providing lightning strike protection, on composite aerostructures, is through the...
Go to contribution page -
S. Nißl (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4008.pdfIn a pair plasma, the two oppositely charged particle species have a mass ratio of one. This property is predicted to have significant influence on the behavior of such a plasma including extraordinary stability characteristics [1]. APEX (A Positron-Electron Experiment) aims to create this kind of plasma in a...
Go to contribution page -
L. Chen (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4009.pdfComplex braided magnetic structures are known to self-organize in plasmas. Through often violent reconnection events, an elaborate braid can detangle itself to form straight flux tubes. Despite our advanced knowledge of plasma physics today, it remains unclear how to predict the topology of the magnetic structure...
Go to contribution page -
M. Guarguaglini (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4010.pdfWater, methane, and ammonia are amongst the key components of Uranus and Neptune. Knowing their equation of state, conductivity, and transport properties at planetary interiors conditions (pressures of several megabar and temperatures of a few thousand Kelvin) is required for developing precise models of the two...
Go to contribution page -
P. Lageyre (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4011.pdfGravitationnal waves have been predicted from Einstein's equations since he wrote his theory on General Relativity [1]. A century later, the LIGO [2] and VIRGO interferometers were at last able to pick up a gravitationnal wave from the merging of extremely massive astrophysical objects. The existence of gravitationnal...
Go to contribution page -
N. Kenmochi (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4012.pdfThe Ring Trap 1 (RT-1) device creates a laboratory magnetosphere that is realized by a levitated superconducting ring magnet in vacuum [1]. The RT-1 experiment has demonstrated the self-organization of a plasma clump with a steep density gradient; a peaked density distribution is spontaneously created through 'uphill...
Go to contribution page -
E.D. Gospodchikov (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4013.pdfElectron cyclotron instabilities caused by resonant interaction between energetic electrons and electromagnetic waves are typical for plasma confined in open magnetic configurations. Studies of the cyclotron instabilities of non-equilibrium plasmas have led to the plasma cyclotron maser paradigm, which explains a...
Go to contribution page -
H. Bohlin (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4014.pdfShock formation through the interaction of supersonic plasma jets with ambient plasma is ubiquitous in astrophysics. Since magnetic fields often play a role in these systems, it is of particular interest to understand how they affect the formation and evolution of shocks. An investigation of magnetized shocks has...
Go to contribution page -
K.M. Schoeffler (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4015.pdfIn recent years, experiments with laser-target interactions create plasma with extremely strong magnetic fields (~ MGauss). With these conditions, and the unprecedented resolution that these experiments can now operate, we are able to probe physics that also occurs in astrophysical systems. In particular, the...
Go to contribution page -
J. Capitaine (EPS 2019)08/07/2019, 14:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P1.4016.pdfMegaGausslevel magnetic fields applied to laser produced plasmas are opening the door to a range of new studies in inertial confinement fusion and laboratory astrophysics. Our experiments and related theoretical work have addressed the physics of magnetized accretion flows [1], jet collimation [2, 3] and variability...
Go to contribution page -
J. Stober (EPS 2019)08/07/2019, 16:30MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.101.pdfThe ECRH system of ASDEX Upgrade has been upgraded over the last 15 years from a 2 MW, 2 s, 140 GHz system to an 8 MW, 10 s, dual frequency system (105/140 GHz). The power exceeds the L/H power threshold at least by a factor of two even for high densities and roughly equals the installed ICRF power. The power of both...
Go to contribution page -
J.J. Rocca (EPS 2019)08/07/2019, 16:30BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.201.pdfThe trapping of femtosecond laser pulses of relativistic intensity deep within ordered nanowire arrays can volumetrically heat dense matter into a new ultra-hot plasma regime [1]. Electron densities more than 100 times greater than the critical density with multi-keV temperatures are achieved using ultrashort laser...
Go to contribution page -
A. Michau (EPS 2019)08/07/2019, 16:30LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.301.pdfParticles immersed in a plasma undergo charge fluctuation due to collisions with ions and electrons which has a strong bearing on their aerosol dynamics and thermal balance. As a matter of fact, a significant fraction of nm-sized particles can be non-negatively charged which enhances the coagulation kinetics and as a...
Go to contribution page -
C. Krafft (EPS 2019)08/07/2019, 16:30BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.401.pdfIn the source regions of the Type III solar bursts, energetic electron beams are accelerated in the low solar corona during flares. Observations show that such beams can propagate in the solar wind up to distances around 1 AU and beyond, generating Langmuir turbulence that emits specific electromagnetic radiation. The...
Go to contribution page -
G. Giruzzi (EPS 2019)08/07/2019, 17:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.102.pdfJT-60SA is a large fully superconducting new tokamak device being built jointly by Europe and Japan, and due to start operation in 2020 [1]. In this prospect, a broad set of preparation activities [2] has been carried out for years, involving the elaboration of the JT-60SA Research Plan [3], and is now focusing on the...
Go to contribution page -
M. Passoni (EPS 2019)08/07/2019, 17:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.202.pdfThe investigation of superintense laser-driven ion sources and their potential applications offer unique opportunities of multisciplinary research [1]. Plasma physics can be combined with materials and nuclear science, radiation detection and advanced laser technology, leading to novel research challenges of great...
Go to contribution page -
P.R. Levashov (EPS 2019)08/07/2019, 17:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.302.pdfDense metallic plasma is a complicated object for both theoretical and experimental study. Due to very high coupling and degeneracy parameters traditional chemical picture and perturbation approaches are of questionable applicability for such plasma. Strong correlation effects hamper the usage of average atom models....
Go to contribution page -
E. Alves (EPS 2019)08/07/2019, 17:00BSAP
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.402.pdfJets emanating from active galaxies are among the most powerful particle accelerators in the universe. They shine across the entire electromagnetic spectrum, and are candidate sources of ultrahigh-energy cosmic rays. Yet, the dominant mechanisms responsible for particle acceleration in these systems are not well...
Go to contribution page -
M. Nocente (EPS 2019)08/07/2019, 17:30MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.103.pdfEnergetic particles in the MeV range are ubiquitous in fusion devices [1]. On one hand, they can be suprathermal ions born from the fusion reactions or accelerated by ion cyclotron resonance heating. On the other hand, they can be runaway electrons (REs) that are spontaneously generated, for example, during a...
Go to contribution page -
J.J. Santos (EPS 2019)08/07/2019, 17:30BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/I1.203.pdfGeneration of laser-driven quasi-static magnetic fields (B-fields), in the range of the kTesla, paves the ground for novel high energy-density physics (HEDP) investigations.
Go to contribution page
I will review results and physical understanding in driving such strong B-fields. At LULI [Santos2015] and Gekko-XII [Law2016] laser facilities,... -
M. Mozetič (EPS 2019)08/07/2019, 17:30LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.303.pdf
ow pressure gaseous plasma is a suitable medium for tailoring surface properties of solid materials on industrial scale. Treated materials are subjected to positively charged atomic and molecular ions, neutral radicals and ultraviolet as well as vacuum ultraviolet radiation. The penetration depth of ultraviolet...
Go to contribution page -
A. Grassi (EPS 2019)08/07/2019, 17:30BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.403.pdf
Collisionless shocks are ubiquitous in the Universe and play an important role in the slow down of plasma flows, magnetic field generation/amplification, and particle acceleration. Depending on the plasma conditions, different plasma processes are believed to mediate shock formation and particle injection, however,...
Go to contribution page -
Y. Todo (EPS 2019)08/07/2019, 18:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.104.pdf
Magnetohydrodynamics (MHD) is a theoretical framework that explains well the macroscopic plasma behaviours. However, MHD is an unfinished framework for magnetically confined plasmas, because the MHD pressure equation assumes sufficiently high collision frequency which is not valid for the high-temperature plasmas. One...
Go to contribution page -
H.T. Kim (EPS 2019)08/07/2019, 18:00BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.204.pdf
Laser wakefield acceleration (LWFA) can realize compact electron accelerators using significantly higher acceleration field than that of conventional rf accelerators. The progress of laser technologies reached PW peak power [1] and advanced the energy of laser electron accelerators to several GeV energy range [2,3]....
Go to contribution page -
N. Škoro (EPS 2019)08/07/2019, 18:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.304.pdf
In recent years, expansion of non-equilibrium plasma applications is directed towards plasma sources operating at atmospheric pressure that are used for treatment of liquids. Usually, different applications involving liquid targets have different aims and, as precondition for all these applications, it is important to...
Go to contribution page -
L.G. Suttle (EPS 2019)08/07/2019, 18:00BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I1.404.pdf
The interactions of fast-streaming, magnetized plasmas can result in a wide range of fundamental plasma physics processes such as the formation of MHD shocks, magnetic turbulence, reconnection and wave-particle interactions. We present experiments from a versatile platform, where supersonic plasma flows generated by the...
Go to contribution page -
H. Baránková (EPS 2019), L. Bardos09/07/2019, 09:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.005.pdf
Hollow Cathodes are high-density plasma sources that are non-equilibrium from their principle. They are characterized by high activation and ionization degrees and can work in a broad range of parameters - pressures, powers and gas flows. They are scalable, versatile and cost effective. They enable both PVD (Physical...
Go to contribution page -
J. Fuchs (EPS 2019)09/07/2019, 09:35BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.006.pdf
Coupling high-power lasers and high-strength magnetic fields helps gaining unique insight and understanding of a variety of phenomena of crucial importance for astrophysics. We have shown that such platform could be used to mimic the expansion of a young star isotropic disk wind threaded by a co-axial poloidal magnetic...
Go to contribution page -
H. Reimerdes (EPS 2019)09/07/2019, 10:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.101.pdf
The European roadmap for fusion energy has identified plasma exhaust as a major challenge towards the realisation of magnetic confinement fusion. To mitigate the risk that the baseline scenario with a single null divertor (SND) and a high radiation fraction adopted for ITER will not extrapolate to a DEMO reactor, the...
Go to contribution page -
T.M. Wauters (EPS 2019)09/07/2019, 10:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.102.pdf
This contribution reviews the currently applied wall conditioning methods in fusion devices with special emphasis on wall conditioning in the presence of a permanent magnetic field by applying RF discharges at the ion- and electron cyclotron range of frequencies (ICRF resp. ECRF). The review is built upon the results of...
Go to contribution page -
O. Kylián (EPS 2019)09/07/2019, 10:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.301.pdf
Tremendous progress that experiences the field of the nano-fabrication opens new entrancing opportunities in terms of the production of materials with advanced functionalities. In spite of undisputable successes of chemistry-based methods or strategies that utilize nanolithography, the use of these methods brings also...
Go to contribution page -
A.S. Davies (EPS 2019)09/07/2019, 10:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J501.pdf
The rapid, picosecond time-scale evolution of electron density and temperature in a laser-produced plasma was measured using collective Thomson scattering [1]. As is the case for many laser-plasma applications, an underdense (~10^19 cm^-3) H2 plasma was created by a 60-ps, 1053-nm laser pulse with an intensity of ~3 x...
Go to contribution page -
A. Drenik (EPS 2019)09/07/2019, 11:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.103.pdf
To prevent damage to the divertor target plates, impurity seeding will be unavoidable in ITER. Among the tested impurities, nitrogen (N) is the most likely candidate impurity. Besides promoting the radiation in the plasma edge, nitrogen seeding also provides improved confinement in existing tokamaks. The drawback of...
Go to contribution page -
G. Colonna (EPS 2019)09/07/2019, 11:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.302.pdf
Electron energy distribution functions (eedf), vibrational and electronic excited states are selfconsistently coupled for discussing the formation of ammonia under nano-second repetitively pulsed discharges. The Boltzmann equation for free electron is solved to determine the eedf, accounting for inelastic, superelastic...
Go to contribution page -
M. Tamburini (EPS 2019)09/07/2019, 11:10Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J502.pdf
Powerful gamma-ray emissions are ubiquitous in astrophysics, from active galactic nuclei [1] to pulsars [2] and neutron star mergers [3]. One of the key mechanisms leading to powerful gamma-ray emissions is thought to be the interaction of ultrarelativistic particle beams with a surrounding plasma environment, which...
Go to contribution page -
T.A. Lunt (EPS 2019)09/07/2019, 11:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.101.pdf
Power exhaust is expected to become a problem in a future fusion reactor based on the Tokamak design in conventional single-null (SN) configuration. As a potential solution, alternative divertor geometries are currently discussed and investigated by many laboratories in the world [1]. In order to study a series of...
Go to contribution page -
P. Martin (EPS 2019)09/07/2019, 11:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.102.pdf
Appropriate disposal of the non-neutronic energy and particle exhaust in a reactor is universally recognized as one of the high priority challenges for the exploitation of fusion as an energy source. The new Divertor Tokamak Test (DTT) facility, which will be built in Italy, is a tool to address that challenge in...
Go to contribution page -
G. Vieux (EPS 2019)09/07/2019, 11:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J503.pdf
High power, short pulse lasers have become valuable tools for scientists exploring a wide range of phenomena and developing new technologies such as ultra-compact wakefield accelerators [1] and compact light sources [2] with applications ranging from particle physics to biology. To produce ultra-intense, short pulses,...
Go to contribution page -
F. Riva (EPS 2019)09/07/2019, 11:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.103.pdf
In the present work, global, three-dimensional edge plasma turbulence simulations of a MAST L-mode attached plasma discharge are presented. Our study is based on the driftreduced Braginskii equations, solved with the STORM module of BOUT++ for realistic MAST parameters in disconnected lower double null configuration....
Go to contribution page -
A. Kirschner (EPS 2019)09/07/2019, 11:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.107.pdf
Tungsten (W) is a candidate for plasma-facing components in future fusion reactors like DEMO and already used in fusion experiments like JET-ILW and ITER, which is currently under construction. It is foreseen for wall areas of highest particle and power loads as it has high melting point and low physical sputter yield....
Go to contribution page -
V. Pigeon (EPS 2019)09/07/2019, 11:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.301.pdf
The sheath standing in front of different ceramics -- used in Hall thrusters, where their nature is known to have an influence on the device efficiency [1] -- is studied thanks to the nonintrusive Laser Induced Fluorescence (LIF) diagnostic. The study aims to provide a better understanding of the sheath structure under...
Go to contribution page -
N. Ohana (EPS 2019)09/07/2019, 11:55MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.104.pdf
In order to get a better understanding of the linear and nonlinear plasma interaction of microinstabilities and associated turbulence with different specific modes, an antenna is implemented in the global gyrokinetic code ORB5. It consists in applying external chargeand current-density perturbations or, alternatively,...
Go to contribution page -
C.D. Challis (EPS 2019)09/07/2019, 11:55MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.108.pdf
The initial current ramp phase of JET hybrid plasmas is used to optimise the q-profile to allow access to high beta and avoid MHD instabilities. Mixed protium-deuterium experiments have shown that the q-profile evolution during this phase varies systematically with average main ion isotope mass (Meff), as seen in Fig.1,...
Go to contribution page -
I. Schweigert (EPS 2019)09/07/2019, 11:55LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.302.pdf
The plasma-wall interaction is a fundamental process determining the plasma parameters. The different types of sheathes over an planar/grooved emissive walls in electromagnetic fields of discharge plasmas are discussed in this paper. In kinetic simulations and in experiments, we found a plasma sheath rearrangement...
Go to contribution page -
L. Willingale (EPS 2019)09/07/2019, 12:10Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J504.pdf
The extremely energetic class of astrophysical phenomena - including high-energy pulsar winds, gamma ray bursts, and jets from galactic nuclei - have plasma conditions where the energy density of the magnetic fields exceeds the rest mass energy density (sigmacold = B^2/(µ0nemec^2)), the cold magnetization parameter)....
Go to contribution page -
M. Griener (EPS 2019)09/07/2019, 12:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.105.pdf
In magnetic confinement fusion, transport processes in the plasma edge region determine the power load onto the first wall materials which has to be minimized on the way towards a fusion power plant. While a main fraction of the power is transported parallel to the magnetic field lines to the divertor, a significant...
Go to contribution page -
A.V. Dudkovskaia (EPS 2019)09/07/2019, 12:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.109.pdf
Understanding the physics of the NTM onset and its suppression is a key problem in achieving controlled fusion. This requires better knowledge of the NTM threshold mechanism.
Go to contribution page
We solve the drift kinetic equation for the ion/electron response to the NTM magnetic perturbation, gi,e, assuming small magnetic island width,... -
J. Muñoz Espadero (EPS 2019)09/07/2019, 12:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.303.pdf
Microwave plasmas sustained at atmospheric pressure are applied in many fields due to the flexibility and high chemical reactivity that result from non-equilibrium operation conditions. However, the performance of a plasma in a specific technological application is determined by the density of active species and their...
Go to contribution page -
A.A. Stepanenko (EPS 2019)09/07/2019, 12:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.106.pdf
Observations of divertor plasma turbulence in a series of experiments at the DIII-D tokamak has recently demonstrated the onset of parallel current and magnetic field fluctuations [1] with temporal parameters similar to those reported for the fluctuations of divertor plasma radiation intensity at the ASDEX Upgrade...
Go to contribution page -
L. Gil (EPS 2019)09/07/2019, 12:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.110.pdf
The H-mode is the preferable operation regime for a fusion reactor due to its superior confinement properties, but it comes with a major drawback: edge-localized modes (ELMs). These instabilities lead to unacceptably high heat loads on the divertor when extrapolated to large-scale machines [1]. The ELM-free phases...
Go to contribution page -
A.J. Creely (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1001.pdfSPARC is designed to be a high-field (B0 = 12 T), compact (R0 = 1.65 m), D-T burning plasma tokamak with the goal of producing net energy gain (Q > 1) from magnetic fusion for the first time. Currently in the pre-conceptual design phase, SPARC will utilize new magnets based on rare-earth barium copper oxide (REBCO) high...
Go to contribution page -
R. Goldston (EPS 2019)09/07/2019, 14:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1002.pdf
Go to contribution page -
M. Veranda (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1003.pdfThe edge of magnetically confined plasmas in toroidal configurations is characterized by the presence of various magnetic perturbations (MPs), appearing spontaneously as tearing modes in the Reversed Field Pinch (RFP) [1] or as peeling ballooning modes (ELM) in the tokamak. In the RFX-mod device during high-current...
Go to contribution page -
I. Mario (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1004.pdfThe neutral beam injection (NBI) system for the ITER experiment will be based on the production and acceleration of negative H/D ions. The ion beam requirements combine high accelerated current density (230 A/m2 in H, 200 A/m2 in D) with low core divergence (<7 mrad) and high uniformity over the extraction surface (better...
Go to contribution page -
R.J. Buttery (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1005.pdfFirst of a kind physics-based simulations project a compact net electric fusion pilot plant with a nuclear testing mission is possible at modest scale based on the advanced tokamak concept, and identify the key parameters for its optimization. These utilize a new integrated 1.5D core-edge approach for whole device modeling...
Go to contribution page -
J.W. Berkery (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1006.pdfDisruption prediction and avoidance is necessary in future MAST-U spherical tokamak discharges to enable long-pulse plasma operation. Research examining the stability of plasmas in the MAST database utilizing new kinetic equilibrium reconstructions and comparisons to present models in the Disruption Event Characterization...
Go to contribution page -
M. Ghasemi (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1007.pdfThe Alborz tokamak project has been in the phase of construction at the Amirkabir University of Technology, Iran, since 2012. The completion of this new fusion experimental device fabrication accomplished recently and the start of its commissioning phase is scheduled for the near future. To this end, the initial system...
Go to contribution page -
S.D. Pinches (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1008.pdfThe ITER Integrated Modelling & Analysis Suite (IMAS) is the software infrastructure developed using expertise from across the research facilities within the ITER Members to meet the needs of the ITER Integrated Modelling Programme. It builds around a standardised representation of data described by a Data Dictionary that...
Go to contribution page -
R.I. Khusnutdinov (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1009.pdfAn analysis is carried out of the possibility of using the high-resolution spectroscopy (HRS)
data, specifically, the asymmetry of the spectral line shape of the radiation emitted in the
Balmer-alpha lines of hydrogen isotopes, to recover the flux of neutral hydrogen atoms and
molecules from the tokamak first wall to the SOL... -
P.V. Minashin (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1010.pdfElectron cyclotron radiation (ECR) in ITER (in contrast to all previous devices) is expected to play an important role in power loss balance due to high electron temperature and high magnetic field [1], [2]. This radiation is also a source of additional thermal and electromagnetic load for microwave and optical diagnostic...
Go to contribution page -
E. Perelli Cippo (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1011.pdfPresent day Fast Ion Loss Detectors (FILD) installed in tokamaks and stellarators are usually made of a scintillator coupled to a suitable optical system. For the conceptual design of an ITER-relevant FILD prototype for JT-60SA (using a scintillator as sensitive element) it was suggested that the neutron flux that will be...
Go to contribution page -
A.S. Kukushkin (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1012.pdfDEMO-FNS is a tokamak-based fusion neutron source project being developed in Russia [1]. Issues of energy removal from DEMO-FNS were considered in [2], [3] in the "closed box" [4] approximation where the external sources and sinks of the particles, such as gas puffing and pumping, are essentially neglected. In the present...
Go to contribution page -
P.F. Buxton (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1014.pdfTokamak Energy Ltd. have recently completed the first programme of operations within the compact (R = 0.4 m) spherical tokamak ST40. During the first programme ST40 was operated without a central solenoid and start-up was achieved using the Merging/Compression technique. Plasmas with a 15 ms (flat top) duration were...
Go to contribution page -
X. Chen (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1015.pdfWide-pedestal quiescent H-mode is characterized by a pedestal width exceeding the EPED-KBM limit and an Er profile that is shallower and broader than standard QH-mode or H-mode. This natural ELM-stable regime was first discovered when the NBI torque was ramped down from strong counter-Ip towards net-zero in high...
Go to contribution page -
R.J. Groebner (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1016.pdfRecent experiments performed in DIII-D provide strong evidence that the edge particle source has important effects on the density pedestal structure. These experiments were performed primarily in two divertor configurations, one a very open divertor (little baffling of neutrals) and one highly closed (good baffling of...
Go to contribution page -
S. Xu (EPS 2019)09/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1017.pdf
A serious challenge for high-power long-pulse operations of the tokamak is how to prevent damage to the plasma-facing components by particles from the edge plasma. Recently, a potential actuator to control the divertor flux distribution by using the synergy of the supersonic molecular beam injection (SMBI) and magnetic...
Go to contribution page -
M. Anastopoulos (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1018.pdfH-mode tokamak plasmas are typically characterised by quasi-periodic instabilities called edge localised modes (ELMs) driven by unstable peeling-ballooning modes [1]. For large scale fusion power plants, the predicted particle and heat fluxes are unacceptable, and an active ELM control method is required. One promising...
Go to contribution page -
Q. Yu (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1019.pdfThe effect of externally applied resonant magnetic perturbations (RMPs) on the plasma current density gradient in the vicinity of resonant surfaces is investigated, based on two-fluid equations. In our paper we focus on m/n=4/2 or 6/3 RMPs. RMPs of moderate amplitude (~ 10-4 - 10-3 of the toroidal field) are found to be...
Go to contribution page -
H. de Blank (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1020.pdfThe radial electric field Er is thought to play a role in the suppression of turbulence in the edge transport barrier that causes H-mode confinement in tokamaks. A range of mechanisms have been proposed that may positively or negatively contribute to Er. Among the non-ambipolar particle transport channels that together...
Go to contribution page -
K. Lee (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1021.pdfUnderlying mechanisms of Bohm diffusion, E-field formation, and the suppression of turbulence have been remained unexplained for many years. The analysis of Gyro-Center Shift (GCS) is based on the ion-neutral collisions. GCS analysis provides a new perspective on how the electric fields can be generated and the particle...
Go to contribution page -
G. Hu (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1022.pdfEdge coherent mode (ECM), previously identified as the dissipative trapped electron mode [1], is commonly observed in the H-mode pedestal with a relative high collisionality in the EAST tokamak. This mode is considered contributing significantly to suppression of crash of large ELMs benefitting from the remarkable particle...
Go to contribution page -
F. Napoli (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1023.pdfThe EPED model [1] can predict the H-mode JET-ILW pedestal height and width within a relative error of about 20% when the pedestal is close to the Peeling-Ballooning (PB) boundary. However, when the pedestal is far from the PB boundary, our present understanding of the pedestal physics is still lacking [2,3]. Moreover, the...
Go to contribution page -
D.V. Borodin (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1024.pdfJET is a unique tokamak equipped with the ITER-like wall (ILW) comprised of beryllium (Be) main chamber and tungsten (W) divertor. JET allows operation with tritium (T), thus studying the H/D/T isotope effect on the plasma-wall interaction (PWI). Be limiters meet the most of the direct plasma impact, however part of the...
Go to contribution page -
A. Bortolon (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1025.pdfThe performance and operation of magnetic confinement fusion devices strongly depend on the characteristics of PFCs, which represent the principal source of impurities and, through deuterium recycling, can contribute substantially to plasma fueling. A commonly-used method to reduce and control these effects is to...
Go to contribution page -
D. Brida (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1026.pdfIn divertor tokamaks heat is flowing in a narrow channel of width q towards the divertor targets. Having a reliable extrapolation of q for ITER and DEMO is essential for the development of power exhaust scenarios, which led to the development of experimental multi machine scaling laws for q obtained from low edge density...
Go to contribution page -
L. Casali (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1027.pdfFirst impurity seeding experiments with N and Ne injection in the new SAS (Small Angle Slot) divertor at DIII-D show the simultaneous achievement of divertor detachment, stable discharge behavior and unchanged (N) or even improved pedestal performance (Ne). N seeding in the SAS divertor leads to the simultaneous...
Go to contribution page -
H. De Oliveira (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1028.pdfWe will present first results from the fast-moving Reciprocating Divertor Probe Array (RDPA). This novel diagnostic provides two-dimensional (2D) Langmuir probe measurements across the TCV divertor plasma up to the X-point, enabling unprecedented insights into divertor profiles and fluctuations. The 2D region is covered...
Go to contribution page -
A. Fil (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1029.pdfPlasma detachment needs to be achieved in ITER and future devices such as DEMO to dissipate most of the power in the Scrape-Off-Layer (SOL) and to reduce the particle flux reaching the divertor targets. To enhance our capability to improve current, and design future tokamaks, we must improve our understanding of the...
Go to contribution page -
M. Komm (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1030.pdfPartial detachment is the required regime for the baseline burning plasma scenario in ITER and next step devices, as it allows to convert the majority of the energy carried by charged particles through the scrape-off-layer (SOL) into isotropic radiation and thus avoids a localized heat flux deposition in the divertor...
Go to contribution page -
H. Kumpulainen (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1031.pdfhe tungsten ion average charge states in EDGE2D-EIRENE simulations of the JET scrape-off layer are predicted to decrease by up to 40% when the 74 ion states are bundled into 6 fluid stages, compared to reference cases using the Monte Carlo code DIVIMP and a more elaborate bundling scheme in EDGE2D-EIRENE. The ionization...
Go to contribution page -
J. Lovell (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1032.pdfAlcator C-Mod measurements of the radiated power density profiles using resistive bolometry in high density (up to 3.2E20 m-3) Ohmic L-mode plasmas show elevated signal levels, up to 0.9MW/m2, outside the separatrix. Such near scrape-off-layer observations are not present at lower densities of up to 1E20m-3, and it is...
Go to contribution page -
J.H. Nichols (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1033.pdfMixed-material DIVIMP-WallDYN modelling, now incorporating ExB drifts, is presented that simultaneously reproduces tungsten (W) erosion and deposition patterns observed during the DIII-D Metal Rings Campaign, in which toroidally symmetric W-coated tiles were installed in the carbon (C) DIII-D divertor. It is demonstrated...
Go to contribution page -
M. Sala (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1034.pdfIt is well-known that to investigate plasma wall interaction in ITER-relevant conditions both experimental and theoretical efforts are needed. Concerning the former aspect, linear plasma devices are usually adopted, being able to generate ITER-relevant plasmas. On the numerical aspect, dedicated codes have been developed...
Go to contribution page -
3242. P2.1035 The dynamics of filaments in attached and detached SOL conditions using 3D simulationsD. Schwörer (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1035.pdfFilaments are field aligned density and temperature perturbations, which provide a significant flux of particles and heat from the last closed flux surface to the far scrape-off layer (SOL). In order to design next generation tokamaks operating in high density regimes, it is beneficial to make robust predictions of wall...
Go to contribution page -
D. Silvagni (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1036.pdfUnderstanding how the scrape-off layer (SOL) power decay length q scales with plasma quantities is essential for designing fusion reactors and developing a power exhaust solution. An inter-machine database [1] showed that, in inter-ELM H-mode, q scales approximately inversely with the poloidal magnetic field....
Go to contribution page -
S.F. Smith (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1037.pdfDuring edge localised modes (ELMs) high heat fluxes are incident on divertor targets, which future fusion devices will not withstand [1]. A solution to reduce the heat fluxes could be the new Super-X divertor, which will be tested on the MAST-U tokamak. The divertor has an increased connection length, magnetic flux...
Go to contribution page -
K. Verhaegh (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1038.pdfThe process of divertor detachment, whereby heat and particle fluxes to divertor surfaces are strongly mitigated, is required to reduce heat loading and erosion in a magnetic fusion reactor.
Go to contribution page
In previous research [1] we have provided a full interpretation of particle/power balance in the TCV (L-mode) divertor using... -
M.R. Wigram (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1039.pdfThe divertor heat-flux problem remains a major challenge for both present and future high power tokamak fusion experiments and pilot power plant designs. Current divertor designs are informed by large-scale fluid simulation codes, e.g. SOLPS, UEDGE, EDGE2D, but none of these presently capture important kinetic effects in...
Go to contribution page -
A. Wingen (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1040.pdfNon-axisymmetric heat flux patterns on a tokamak divertor can result for several reasons. Here we focus on the two most common causes. First, the plasma equilibrium itself can be nonaxisymmetric, either from applied or intrinsic 3D perturbation fields, and second, the plasma facing components (PFCs) may be toroidally...
Go to contribution page -
M. Peret (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1041.pdfUnderstanding the plasma transport at the boundary of magnetic confinement devices is needed to improve both confinement & power exhaust. Low to high confinement mode transition relates to the reduction of transport across flux surfaces near the separatrix, and transport in the scrape off layer (SOL) directly sets the...
Go to contribution page -
J. Adamek (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1042.pdfInvestigation of the ELM using divertor probes can provide heat loads and electron temperature with high temporal resolution [1, 2]. Recent evaluation of ELM electron temperature with JET divertor probes showed that the maxima of ELM electron temperature are almost one order of magnidute lower than the pedestal temperature...
Go to contribution page -
G. Akkermans (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1043.pdfIn ITER and other next-generation fusion devices, divertor detachment will be crucial to limit the heat and particle fluxes to plasma-facing components to tolerable levels. This work investigates the importance of molecular effects on detachment. A type of molecular reaction of interest in this work is Molecule-Activated...
Go to contribution page -
L. Bock (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1044.pdfTo interpret impurity migration measurements in fusion experiments the evolution of the first wall surface composition and the resulting dynamics of impurity fluxes into the plasma have to be taken into account. The global impurity migration code WallDYN [1] calculates the surface compositions and impurity fluxes self...
Go to contribution page -
I. Borodkina (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1045.pdfCOMPASS Upgrade (COMPASS-U) is a medium-size, high-magnetic-field and high-density tokamak project with a flexible set of the poloidal field coils for generation of the single-null, double-null and snowflake divertor configurations. With its high plasma and neutral density, closed divertor and strong ITER-like target...
Go to contribution page -
M. Brenzke (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1046.pdfOne of the main challenges in the design of an economically viable fusion reactor are the highly localized thermal loads experienced by the plasma facing components, especially the targets in a divertor-based design, on which this work focuses. These thermal loads cause degradation of the target material and might severely...
Go to contribution page -
V.P. Budaev (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1047.pdfPowerful plasma load on the plasma facing material in tokamaks during transients (disruption, ELMs, VDE etc.) produces several multiscale effects including surface erosion, redeposition of eroded materials, melting and melt motion over the surface, inhomogeneous solidification leading to specific surface clustering...
Go to contribution page -
B. Buttenschön (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1048.pdfThe recent operation phase OP1.2b of the superconducting stellarator Wendelstein 7-X (W7-X) was the first experimental campaign with a boronized wall in this machine. Wall conditioning by means of boronization is a standard technique to reduce the influx of intrinsic impurities, typically carbon and oxygen, from plasma...
Go to contribution page -
R. Chandra (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1049.pdfThe realization of fusion energy requires breakthroughs in divertor control to withstand the tremendous heat flux from a burning plasma. One solution is to operate in the detached plasma state. Reaching and controlling this state require better understanding of the underlying mechanisms. By using linear plasma generators,...
Go to contribution page -
M. Cole (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1050.pdfIn recent work, the total-f global gyrokinetic particle-in-cell code XGC has been extended to stellarator geometries. In this presentation, we show verification studies and initial results with the new stellarator version, XGC-S, for ion temperature gradient driven modes. XGC-S calculations are found to agree well with the...
Go to contribution page -
O.P. Ford (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1051.pdfIn a survey of ion temperature (Ti) profiles in ECRH dominated W7-X plasmas during the most recent W7-X campaign, it is found that no strong dependence of the central ion temperature on either electron temperature or plasma density exists. This indicates that the ion heating, which occurs through transfer of heat from...
Go to contribution page -
B. Shanahan (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1052.pdfThe topology of the Wendelstein 7-X edge and scrape-off-layer exhibits stochastic fields, island chains, highly varying connection lengths, and a non-uniform curvature drive for plasma turbulence. These challenges have previously inhibited successful development of a plasma fluid turbulence simulation framework. The BSTING...
Go to contribution page -
N. Chaudhary (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1053.pdfThe W7-X stellarator with its large aspect ratio has spectrally well separated electron cyclotron harmonics compared to tokamaks. Because of this geometrical advantage, it is easier to address the electron cyclotron harmonics (70,140,210...GHz) at a magnetic field of 2.5 T. In a standard electron cyclotron emission (ECE)...
Go to contribution page -
M. Hirsch (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1054.pdfThe electron cyclotron emission (ECE) diagnostic system of W7-X is comprised of a 32 channel radiometer for detecting the 2nd harmonic emission1 in the frequency range from 126 to 162 GHz and a Michelson interferometer providing broadband spectra 2 that share the same line of sight. The EC emission was measured throughout...
Go to contribution page -
P.Z. Poloskei (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1055.pdfBalmer-alpha spectroscopy allows important and versatile investigations of fusion plasmas. In particular active spectroscopy with lines of sight intersecting the paths of neutral beams has become an important diagnostic technique since it carries information on important plasma parameters such as the fast-ion density, the...
Go to contribution page -
H. Trimino Mora (EPS 2019)09/07/2019, 14:00MCF
see full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1056.pdf
Plasma physics experiments often require a fast estimation of plasma parameters for machine control and safety. On the other hand, to do scientific inference a thorough post-processing analysis and uncertainty handling is carried out. The fast parameter estimation can benefit from a more rigorous handling of the...
Go to contribution page -
T. Windisch (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1057.pdfIn contrast to axi-symmetric devices, the particle fluxes in helical devices strongly depend on the radial electric field Er. This sets a constraint on the radial electric field for given plasma density and temperature profiles, and makes it a key quantity for the neoclassical transport. In recent years, Doppler...
Go to contribution page -
D. Zhang (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1058.pdfThe optimized stellarator Wendelstein 7-X (W7-X) has recently conducted its first divertor operation. One of the main scientific objectives is to examine and optimize the island divertor as a potential concept for a future stellarator reactor. One promising approach is to keep the impurities released from the...
Go to contribution page -
Y. Gao (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1059.pdfWendelstein 7-X (W7-X) is one of the world's most advanced stellarators. Electron cyclotron resonance heating (ECRH) [1] was the main heating system during the operation phase 1.2 (OP 1.2) in W7-X. Apart from heating, the remotely steerable launchers of the ECRH-system allow to drive current at different plasma radii...
Go to contribution page -
A. Knieps (EPS 2019)09/07/2019, 14:00MCF
see full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1060.pdfThe Wendelstein-7X (W7-X) experiment aims to demonstrate steady-state long-pulse discharges at high power and high performance. For heat- and particle-exhaust, W7-X makes use of an island divertor, which relies on a magnetic island chain between the divertor plates and the last closed flux surface. The strike-line shape on...
Go to contribution page -
R. Koenig (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1061.pdfcentral aim of the superconducting stellarator Wendelstein 7-X (W7-X) is to demonstrate the suitability of the island divertor concept to meet the requirements of power and particle exhaust during continuous operation. Without boronisation, stable completely detached plasma operation (peak heat loads reduced by factors of...
Go to contribution page -
V. Perseo (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1062.pdfThe Scrape-Off Layer (SOL) of the Wendelstein 7-X (W7-X) stellarator is characterized by the presence of magnetic islands, which have been exploited for the island divertor configuration. The complex 3D magnetic topology of W7-X leads to a structure of SOL counterstreaming flows that is also 3D. This pattern, previously...
Go to contribution page -
T. Andreeva (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1063.pdfWendelstein 7-X is a modular advanced stellarator, which successfully finished its second test divertor unit experimental campaign in October 2018. Besides establishing divertor operation, this campaign was devoted to the verification of the optimization principles of the machine in different magnetic configurations,...
Go to contribution page -
S.A. Lazerson (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1064.pdfThe BEAMS3D stellarator neutral beam injection (NBI) code [1] is validated against the experimental data of Wendelstein 7-X (W7-X). Experiments scanning density and magnetic configuration were performed in W7-X with the newly commissioned NBI system. Composed of two sources in a single beam box, this NBI system provided...
Go to contribution page -
U. Neuner (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1065.pdfThe intrinsic, diffusion driven toroidal (bootstrap) current has been measured in the stellarator Wendelstein 7-X for several magnetic configurations at line integrated plasma densities between 2 and 16 × 1019 m-2 and heating powers between 0.5 and 6 MW. A Rogowski coil was employed to measure the net toroidal current in...
Go to contribution page -
K. Rahbarnia (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1066.pdfDuring the past operational phase OP1.2b at Wendelstein 7-X (W7-X), wall conditioning via repeated boronization led to enhanced plasma performance. To further support safe W7-X operation, an additional plasma heating interlock system, based on the measured diamagnetic energy (Wdia), has been successfully operated during...
Go to contribution page -
J. Schmitt (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1067.pdfThe reconstruction of the plasma equilibrium plays an important role in interpreting diagnostic signals and understanding the plasma performance for toroidal fusion experiments. Reconstructing the plasma parameters is an iterative process that involves solving the MHD equilibrium, computing synthetic diagnostic signals...
Go to contribution page -
G.A. Wurden (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1068.pdfLow frequency edge fluctuations, localized near the last closed flux surface, which show discrete losses of stored energy with each event, are seen especially clearly in specific magnetic configurations in Wendelstein 7-X. While these are certainly ELM-likea, the questions of the cause of these fluctuations is still open,...
Go to contribution page -
G. Kocsis (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1069.pdfA Tracer-Encapsulated Solid Pellet (TESPEL) injection system was recently developed and installed on the Wendelstein 7-X (W7-X) stellarator. A tracer impurity (typically high-Z materials like iron or tungsten) for impurity transport investigations is embedded into a polystyrene polymer (C8H8)n sphere with a diameter of <1...
Go to contribution page -
M. Machielsen (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1070.pdfFast ion confinement is crucial for the demonstration of the stellarator approach towards fusion energy. To study confinement of fast ions with today's stellarators advanced RF heating schemes can be used to generate fast ions. Secondly, advanced RF heating schemes are developed to improve ion heating performance. Advanced...
Go to contribution page -
M. Ye (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1072.pdfIn the future fusion reactor, power exhaust is one of the most critical issues due to the limit of the heat load onto divertor targets. Because the carbon are not suitable to be used as the first wall material, tungsten divertor is considered as the most appropriate candidate, which implies that impurity seeding is...
Go to contribution page -
M.J. Choi (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1073.pdfNon-diffusive avalanche-like transport events are observed in the L-mode and the weak ITB core plasmas in KSTAR when magnetohydrodynamic instabilities are absent. This observation implies that the avalanche-like event are a prevalent and universal process in the electron heat transport of tokamak plasmas. In addition, the...
Go to contribution page -
M. Falessi (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1074.pdfA framework to validate reduced particle and energy transport models based on the theoretical framework introduced in [1, 2] is proposed. The motivation of the present work is two-fold: (i) extending first-principle-based gyrokinetic simulations to long time scales is extremely demanding from a computational resource point...
Go to contribution page -
S. Haskey (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1075.pdfMeasurements of main-ion (D+) properties from the pedestal top to separatrix are challenging the commonly held assumption that the impurity toroidal rotation and temperature always provides a good proxy for the main-ion properties near the plasma edge. This has far-reaching consequences for SOL boundary conditions,...
Go to contribution page -
M. Marin (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1076.pdfDue to the low gas puff fuelling efficiency in future reactors, pellets will be used to provide the necessary particle fuelling. Since the core isotope composition should be maintained and controlled at 50 : 50% D-T, it is important to understand and accurately model multiple-isotope particle transport, including during...
Go to contribution page -
3284. P2.1077 Core transport studies in tokamaks plasmas via surrogate-based optimization techniquesP. Rodriguez-Fernandez (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1077.pdfUnderstanding transport and validating computer simulations in magnetically confined plasmas is critical for developing predictive models and designing scenarios for future burning plasmas, such as ITER and SPARC. However, the highly nonlinear nature of turbulence means that simulations of plasma behavior are very...
Go to contribution page -
G. Spizzo (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1078.pdfCollisional particle transport in the presence of field perturbations originating from various MHD activity is examined theoretically on tokamaks (ITER, ASDEX Upgrade, NSTX and DIIID) and the reversed-field pinch RFX-mod [1]. For ITER and ASDEX Upgrade, modes typically leading to a disruption [2] are considered. On NSTX...
Go to contribution page -
G.M. Staebler (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1079.pdfGyro-fluid equations are velocity space moments of the gyrokinetic equation. The damping due to kinetic resonances is included through a closure scheme chosen to match the collisionless density response functions. This damping allows for accurate linear eigenmodes to be computed, even in the collisionless limit, with a...
Go to contribution page -
B.P. van Milligen (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1080.pdfOur recent studies [1-3] have shown that heat transport in magnetic confinement devices (the stellarators TJ-II and W7-X) is not a smooth and continuous (diffusive) process, but involves mini-transport barriers associated with low-order rational surfaces and rapid non-local radial `jumps'. This remarkable finding sheds a...
Go to contribution page -
P. Vincenzi (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1081.pdfDuring the last decades, the transition from low to high plasma confinement (L-H transition) has been analysed in several tokamaks showing that the L-H power threshold depends non-linearly on plasma density. A common finding shown both for AUG and C-mod experiments, with different mixes of heating systems, [F. Ryter et al....
Go to contribution page -
E. Neto (EPS 2019)09/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1082.pdfObservations in JET hybrid scenarios show that early termination of the plasma can be caused by tungsten accumulation events, sometimes preceded by large living MHD perturbations [1]. Only recent investigations have been made into understanding the effects of 3D background rotation profiles and 3D MHD equilibria on the...
Go to contribution page -
C. Angioni (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1083.pdfMagnetic confinement plasmas are usually primarily driven by heat sources, with limited particle sources, particularly in the core. This is also the case of a fusion reactor, where the limited penetration of the neutral particles leads to the requirement of using fuelling pellets. Depending on plasma conditions, the...
Go to contribution page -
L. Carraro (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1084.pdfClear evidences that, due to a strong outward impurity convection, impurity core penetration is prevented have been found in the RFX-mod RFP device. A comparable convection of the main gas has not been observed [1] so that a favorable situation with peaked or flat density profiles and hollow impurity profiles is...
Go to contribution page -
B. Ding (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1085.pdfStudies in EAST show that lower recycling and higher source frequency are preferred to improve LHCD (lower hybrid current drive) capability at high density due to the mitigation of parasitic effects of edge plasma, mainly ascribed to parametric instability (PI) and collisional absorption (CA) in edge region [1, 2]. A...
Go to contribution page -
T. Kurki-Suonio (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1086.pdfThe JT-60SA is a large device with a plasma volume 50% larger than JET, and up to 34 MW of NBI heating power. High performance deuterium plasmas are expected to produce neutron rates in excess of 10^(17) n/s. A significant fraction of the fusion reactions will be produced by high-energy NBI ions from 24 MW positive (PNB)...
Go to contribution page -
A. Ram (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1087.pdfThe scrape-off layer and the edge region in fusion plasmas are replete with turbulence induced incoherent fluctuations, and coherent fluctuations, such as blobs and filaments. Radio frequency (RF) electromagnetic waves, excited by antenna structures placed near the wall of a fusion device, encounter this turbulent region...
Go to contribution page -
J. Frank (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1088.pdfTransport in a Tokamak is caused by several mechanisms. While at the plasma edge turbulent transport dominates, neoclassical transport is important in the core region especially for heavy impurities [1]. Furthermore, large-scale MHD instabilities like magnetic islands are known to influence the transport of heat,...
Go to contribution page -
R. Barni (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1089.pdfExperimental investigation of magnetised plasma turbulence is actively pursued in fusion aimed as well as in basic plasma physics toroidal devices. In particular the understanding of turbulent transport mechanisms has a great interest for the improvement of the magnetic confinement. Here we report the results of an...
Go to contribution page -
N. Bonanomi (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1090.pdfSince the first comparisons between different hydrogen isotope plasmas in tokamaks it appeared that deuterium (D) plasmas have generally better performances than hydrogen (H) plasmas [1-4]. The energy and particle confinement times [1-3], the L-H power transition [4,5] and the H-mode pedestal [3,6], essential parameters...
Go to contribution page -
G.D. Conway (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1091.pdfThe interaction of Geodesic Acoustic Modes (GAMs) and Zonal Flows with small-scale turbulence is an important topic in magnetic confinement studies. Much progress has been made in recent years on the measurement, interpretation and numerical simulation of the GAM-turbulence interaction. Using microwave reflectometry...
Go to contribution page -
T. Wegner (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1092.pdfThis contribution reports on the impurity confinement in Wendelstein 7-X which was studied with dedicated impurity injection by means of laser blow-off. Basically, the understanding of impurity transport is a demanding task for stellarators with the aim of steady state operation. Especially, the accumulation of...
Go to contribution page -
M. Pueschel (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1093.pdfMicrotearing (MT) turbulence has been identified as a key player in the evolution of the Hmode pedestal due to its ability to produce electron thermal diffusivities very different from the ion heat and particle diffusivity channels [1]. However, important aspect of the physics of MT instability and turbulence under...
Go to contribution page -
S. Nishimura (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1094.pdfControl of turbulent particle and heat transport is an important issue for magnetically confined fusion plasmas such as tokamaks and helical devices. Repetitive transport bursts due to the magnetohydrodynamic turbulence in the pedestal region, called the edge localized modes (ELMs), will be serious problems for future...
Go to contribution page -
G. Batanov (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1095.pdfNon-local transport and non-Gaussian probability density functions (PDFs) of turbulent fluxes are fundamental physical issues for magnetic confinement fusion that were addressed well in set of works (e.g., review [1] and references therein). Deviation of PDFs from a Gaussian distribution most easily to monitor by...
Go to contribution page -
G. Decristoforo (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1096.pdfIntermittent fluctuations in the scrape-off layer (SOL) are investigated by numerical simulations of two dimensional reduced fluid models describing the evolution of the electron density and electric drift vorticity in the two dimensional plane perpendicular to the magnetic field [1, 2, 3]. Long time series obtained by...
Go to contribution page -
O. Grover (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1097.pdfThe analysis of turbulent flows in the edge region of tokamak plasmas requires the measurement of time-averaged turbulent stresses and fluxes such as the Reynolds stress (RS), which has been identified in recent models and experiments [1] as a likely driver of poloidal zonal flows expected to play a key role in the L-H...
Go to contribution page -
A. Iantchenko (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1098.pdfProper comparison of simulated turbulent fluctuations with experimental observations is necessary for code validation, and for establishing a link between experimental fluctuation measurements and the underlying physics. In this contribution we report on the progress of modelling localised measurements of turbulent...
Go to contribution page -
K. Jirakova (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1099.pdfTurbulent transport in the Scrape-Off Layer (SOL) is an important issue in contemporary tokamak physics due to its role in deteriorating plasma confinement and enhancing the plasmawall interaction. This work compares turbulence properties on two poloidal locations, the outer midplane (upstream) and the divertor target...
Go to contribution page -
M. Pedroni (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1100.pdfDivertor plates of tokamaks are known to be subjected to extremely high heat loads. Melting, cracking and other damages of Plasma Facing Components (PFCs) may occur [1]. Experiments in tokamaks after severe melting of tungsten (W) tiles in the divertor demonstrated that such damage events could compromise the reliable...
Go to contribution page -
F. Bairaktaris (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1101.pdfHomogenization methods for dielectric mixtures have existed for over two decades, but their limitations regarding the wavelength of incoming beam did not allow them to be used extensively in tokamak plasmas. We present a new method which does not have the same limitations, with application to a dielectric plasma mixture...
Go to contribution page -
E. L Claveau (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1102.pdfThe FuZE device produces a 0.3 cm radius by 50 cm long Z-pinch between the end of the inner electrode of a coaxial plasma gun and an end wall 50 cm away. The plasma column is stabilized for thousands of instability growth time by an embedded radially-sheared axial plasma flow, a method proposed in Shumlak and Hartman...
Go to contribution page -
M.G. Levashova (EPS 2019)09/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1103.pdfThe Hall effect, defined as the separation of electric charges of opposite sign when they move in a magnetic field, is suggested to contribute substantially to the observed negative radial electric field E_r in the core plasma in tokamaks and, respectively, to the spontaneous/intrinsic rotation of plasma. A detailed...
Go to contribution page -
K. Ibano (EPS 2019)09/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1104.pdfErosion of wall materials during transient events is a large concern for ITER and future fusion devices with high external heat power. The extensive heat loads cause melting, vaporization, and ablation of wall materials. It is known that the vapor shielding can be an inherent protection mechanism for the wall erosion...
Go to contribution page -
M. Obiki (EPS 2019)09/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.1105.pdfDevelopment of SOL/divertor simulation codes is important to understand physics of edge plasma which determines huge heat fluxes to plasma-facing components, i.e., the bottleneck of fusion device designs. Fluid modeling is mainly used for SOL/divertor plasma simulations. However, there are a number of discrepancies...
Go to contribution page -
K.V. Safronov (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2001.pdfTemporal contrast is a crucial parameter for high-power short-pulse laser facilities. At insufficient contrast, amplified spontaneous emission (ASE) prepulse - which is inherent to lasers based on chirped-pulse amplification scheme - can create plasma on surface of a solid target before arrival of the main pulse. This...
Go to contribution page -
E.A. Peter (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2002.pdfA lot of interesting results come from the triplet concept, where three waves with wavenumber and frequency match conditions interact with themselves, exchanging energy. For example, if the coupling factor is small in a way the frequency of the envelope of each wave is slower than the slowest frequency of the...
Go to contribution page -
V.T. Tikhonchuk (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2003.pdfProcesses of laser energy absorption and electron heating in a hot plasma in the range of irradiances s Iλ^2 = 10^15 – 10^16 W µm^2/cm^2 are of prime importance for the shock ignition scheme of inertial confinement fusion. We studied these processes with large scale kinetic simulations [1, 2] and identified particular...
Go to contribution page -
3317. P2.2005 Novel criteria for efficient Raman or Brillouin amplification of laser beams in plasmaR. Trines (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2005.pdfTwenty years have passed since the seminal paper on Raman amplification in plasma by Malkin, Shvets and Fisch [1]. While Raman amplification has been explored very successfully in theory and simulations [2], no significant Raman amplification of a laser pulse beyond 0.1 TW or 6% efficiency has been achieved [3], and...
Go to contribution page -
B. Greenwood (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2006.pdfLaser-driven neutron sources have recently attracted significant attention due to their potential uses in science, industry, healthcare, and security. In laser-matter interaction experiments, neutrons can be efficiently produced by nuclear reactions involving the laser-driven light ions [1]. Characterisation of these...
Go to contribution page -
S. Ferguson (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2007.pdfAll-optical approaches to ion acceleration are attracting a significant research effort internationally. Energetic ion beams can be readily generated by high intensity lasers via the target normal sheath acceleration (TNSA) process [1]. While the ion energies of such beams remain constrained by available laser...
Go to contribution page -
S. Borodziuk (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2008.pdfInvestigations using the so-called Cavity Pressure Acceleration (CPA) method were carried out on the Prague Asterix Laser System (PALS). The main goal of this research was to test and analyze a possibility of increasing density of plasma objects accelerated by laser light in channel cavity targets. The...
Go to contribution page -
P. Kumar (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2009.pdfDevelopments in CO_2 laser technology at BNL Accelerator Test Facility (ATF) has opened the possibility of exploring CO_2 laser driven wakes, a regime capable of producing large accelerating structures, enabling better probing of wakes and precise external injection. 3D numerical simulations motivated by laser...
Go to contribution page -
A. Helm (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2010.pdfPlasma based acceleration (PBA) is seen as a promising candidate for future accelerators. While magnetic fields are commonly used in conventional accelerators, our previous work [1] has shown that magnetic fields can be used for controlling injection in PBA scenarios. On this paper we extend this work by using the...
Go to contribution page -
F.B. Russman (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2011.pdfSpatially modulated electrostatic fields can be designed to efficiently accelerate particles by exploring the relations between the amplitude, the phase velocity, the shape of the potential and the initial velocity of the particle. The acceleration process occurs when the value of the velocity excursions of the...
Go to contribution page -
S. Kumar (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2012.pdfThe particle accelerators are the most promising and useful devices for mankind. Plasma based accelerators are fascinating as there is no problem of electrical breakdown and these can generate large accelerating fields [1 2]. Laser wakefield acceleration is one of the techniques that employs plasma and high...
Go to contribution page -
M. Yadav (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2013.pdfLaser-wakefield acceleration offers a compact electron acceleration scheme for generating a multi-GeV electron beam, utilizing the high longitudinal electric field gradient induced by high intensity, ultrashort laser pulse. The bubble regime of the laser wakefield acceleration is one of the most recent and promising...
Go to contribution page -
I.D. Almansa (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2014.pdfIn the present analysis we study the dynamics of charged particles under the action of slowly modulated electromagnetic carrier waves. With the use of a high-frequency laser mode along with a modulated static magnetic wiggler, we show that the ensuing total field effectively acts as a slowly modulated high-frequency...
Go to contribution page -
F.B. Rizzato (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2015.pdfIn the present analysis we incorporate radiation effects to the study of the relativistic dynamics of charged particles submitted to the action of slowly modulated, high-frequency electrostatic waves with large amplitudes. Previous analyses ignoring radiation reaction indicate that this setting may be very efficient...
Go to contribution page -
L. Gremillet (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here.
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2016.pdfForthcoming multi-petawatt laser systems (e.g., CoReLS, Apollon, ELI, CAEP-PW) will soon make it possible to achieve laser intensities in excess of 10^22-10^23 Wcm^2. Laser-matter interactions under such extreme conditions will give rise to copious synchrotron or Bremsstrahlung emission of γ-ray photons, which may...
Go to contribution page -
J. Vieira (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2017.pdfThe recent experimental and theoretical progresses have shown that plasma accelerators are very promising because they may provide a new generation of more compact particle accelerators and light sources for various technological and scientific applications. Plasma accelerators often use intense laser beams or...
Go to contribution page -
M. Pardal (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2018.pdfRadiation processes in plasmas are extremely relevant for a number of fields, ranging from astrophysics [1] to small scale microscopy [2]. These processes are usually associated with the motion of a large number of electrons, under the action of intense electric and magnetic self-consistent fields and require...
Go to contribution page -
M. Singh (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2019.pdfWe investigate the propagation of laser pulse in plasmas to estimate the pulse compression based on collisional absorption under weak-relativistic ponderomotive nonlinearity. The physical mechanism behind it is analyzed theoretically. Absorption of laser energy in plasma has been a curial issue, which has been,...
Go to contribution page -
E.P. Volchok (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2020.pdf
Plasma with an electron beam is considered as a source of powerful electromagnetic (EM) emission in various space and laboratory environments. It is well known that in presence of two counterstreaming beams radiation efficiency significantly grows in contrast to the single beam case. This is explained by the fact that... -
M. Niroozad (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2021.pdfA theoretical study of a uniform fast electron beam propagating in a plasma density gradient targets (low density core-high density cladding) is presented. The self-generated magnetic field is calculated using a rigid beam model in cylindrical geometry. It is found that the spontaneous magnetic field peaks at the...
Go to contribution page -
T. Johzaki (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2022.pdf
In fast ignition, an ultra-intense pico-second laser is irradiated to heat a pre-compressed fusion fuel up to the ignition temperature. When the laser-accelerated electron beam is used for core heating, the large beam divergence, the broad energy spectrum and the difficulty in generating fast electrons having suitable... -
O. Klimo (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2023.pdf
One of the most promising techniques to enhance focused laser intensities is to tightly focus the beam using an ellipsoidal plasma mirror. It has been successfully employed to obtain subµm spot size [1] resulting in an order of magnitude increase in focused intensity in comparison with a typical spot size of about 4 µm... -
H. Sakagami (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2024.pdfA target is imploded by long-pulse implosion lasers and its compressed core is heated by fast electrons, which are generated by a short-pulse ultrahigh-intense laser, in the fast ignition scheme. As the location where fast electrons are generated is far from the core due to ablation plasmas, few of them can hit the...
Go to contribution page -
Y. Sentoku (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2025.pdfHigh power lasers with relativistic intensities above 1018 W/cm2 and pulse lengths exceeding picosecond (ps) have been developed in recent years. In over-ps laser-plasma interactions, energy slope of high-energy electrons tends to be higher than the scaling laws used in the sub-ps regime. One of the key mechanisms of...
Go to contribution page -
T. Nakamura (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2026.pdfLaser focused intensity has been increasing since its invention, and is going to reach 1024 W/cm2 and beyond. These intense fields open the new regime of laser-matter interactions. One of the effect playing an important role in laser-matter interaction in this regime is a radiation reaction effect which is a back...
Go to contribution page -
M. Grech (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2027.pdfSMILEI [1] is an open-source, collaborative Particle-In-Cell (PIC) code co-developed by plasma physicists and high-performance computing (HPC) specialists. This poster presents the current status of the project with a special focus on (i) the physics modules available and (ii) the HPC developments and its performance...
Go to contribution page -
G. Cristoforetti (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2028.pdfIn the Shock Ignition (SI) approach to Inertial Confinement Fusion (ICF), an intense laser spike is used to launch a high pressure converging shock in the spherical capsule at the end of the compression phase. In this way the compression and the ignition phases are separated and can be optimized independently. The...
Go to contribution page -
L.M. Chen (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2029.pdfCollimated electron beams produced by intense laser pulses focused onto solid-density plasmas are studied intensively for many applications. Experiments and simulations have shown that the electron beams are emitted at an angle between laser specular and the target normal direction. In particular, an electron jet...
Go to contribution page -
J. Xiong (EPS 2019)09/07/2019, 14:00BPIF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.2030.pdfExperiments and numerical simulation show that -ray radiation can be effectively enhanced with gold foam through a new mechanism. As shown in Fig.1and Fig.2, the intensity laser can enter into the high density reign which is close to the foam's bubble cavity region due to the "hole boring "effect. The reflux cold...
Go to contribution page -
A. Kartasheva (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3001.pdfThe nonlinear features of the oscillatory motion of a single dust particle trapped in a standing striation are investigated. The method of the discharge current modulation [1, 2] is used to excite the nonlinear oscillations with the large amplitude of the order of 1.5 mm. The multi-resonance curves are obtained under...
Go to contribution page -
A. Chami (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3002.pdfThe study of nanoparticle (NP) dynamics is done in a DC unbalanced magnetron discharge using argon plasma at 30 Pa. The plasma is produced between two electrodes: a 7.62 cm diameter tungsten cathode negatively biased and a stainless steel grounded anode 10 cm apart. The discharge current was fixed at 0.3 A and...
Go to contribution page -
A. Mustafaev (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3003.pdfCurrently, the developments in the field of alternative energy are becoming increasingly important due to the need to solve a vast number of problems associated with the creation of compact, reliable, autonomous power sources for spacecraft and other applications, where the conversion of solar energy into electrical...
Go to contribution page -
J. Schäfer (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3004.pdfWe present the helix jet - a stable plasma source with a large homogeneous plasma volume at atmospheric pressure. Challenging applications of material science in high-tech technology implement sources combining homogeneity and stability of vacuum based techniques with a multidimensional flexibility and instrumental...
Go to contribution page -
A.A. Aliverdiev (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3005.pdfHere we present the results of experimental studies on the effect of an external longitudinal magnetic field in a high pressure discharge. Fig. 1 shows typical experimental time dependences of the voltage (upper), current density (middle) and calculated conductivity (lower) in the channel (argon, H=1.6·107 A/m, P=3...
Go to contribution page -
J.V. Triaskin (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3006.pdfThe interaction of neutral and charged gas components is in a high interest of modern physics. This attention is caused mostly by the aerospace applications as well as for exploring the nonlinear wave processes in the near-Earth space (ionosphere). In this work, the interaction of strong shock waves (supersonic bodies)...
Go to contribution page -
S. Valin (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3007.pdfNon-thermal atmospheric pressure plasma jets have been subject to numerous scientific studies during the last decades [1]. An extremely wide application field of such devices demands deep understanding of the plasma processes. One of those, which influences the formation of various spatiotemporal structures in the gas...
Go to contribution page -
V.S. Nikolaev (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3008.pdfDusty plasma is a system of charged micron-sized particles immersed in a plasma. This system is strongly non-ideal due to high charges of particles and strong interaction between them. Thus, observation of ordered structures in a dusty plasma is possible. Such ordered structures are called dusty plasma crystals.
The...
Go to contribution page -
U. Sharma (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3009.pdfA theoretical model is created consolidating the charging rate of the carbon nanotube (CNT), the energy of all the species present in plasma, and the growth rate of the multi-walled carbon nanotube (MWCNT) owing to the surface and bulk diffusions and accumulation of particles on the catalyst nanoparticle surface. Using...
Go to contribution page -
3352. P2.3010 Investigation of radiation spectrum from pulse discharge in atmospheric pressure argonS.A. Mayorov (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3010.pdfAn experimental and theoretical study of the formation of radiation spectra of cathode plasma in a pulsed discharge in argon at atmospheric pressure has been performed. To study the effect of small impurities of the material of the cathode material on the kinetics of ions and electrons in the discharge, the methods of...
Go to contribution page -
A. Momot (EPS 2019)09/07/2019, 14:00LTPD
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3011.pdfDust grains acquire electric charges (eg) due to absorption of electrons (e) and ions (i) from the surrounding plasma, i.e. each grain is charged by the plasma currents Ich ( = e, i) to its surface. The electric field fluctuations influence the charging currents and, thus, give rise to the grain charge fluctuations....
Go to contribution page -
C.M. Ticos (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3012.pdf
The kinetic effects on the dust particles observed in a plasma crystal locally irradiated by a narrow pulsed electron beam with energy 12 and 13 keV and peak current 4 mA are presented [1]. We observe in the top layer of the plasma crystal the formation of a stable dust flow along the irradiation direction in the first... -
M. Isupov (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3013.pdf
Ferromagnetic enhanced inductively coupled plasma sources (FMICP) are considered to be a
promising solution to produce large volumes of dense (~1012 cm-3) uniform plasma for largearea
(450 mm) plasma processing systems, due to a high power transfer efficiency, reduced
driving frequency (<0.4 MHz), the absence of capacitive... -
W. Lee (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3014.pdf
Atoms and ions in plasmas are suffered by collision with another particle, local electric field by electron and ion, plasma radiation, and so on. These interactions cause spectral line broadening of plasma radiation such as natural broadening, Doppler broadening, van der Waals broadening, resonance broadening, and Stark... -
C. Rafferty (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3015.pdf
Gold nanoparticles (GNP) have a wide range of applications in medicine, such as a radiosensitiser in radiotherapy[1], GNP coated single walled carbon nanotubes (SWCNT), to be used as a photothermal agent[2], targeted drug delivery systems, and other forms of cancer treatment and diagnostics[3]. Research into GNP production... -
A. Dahiya (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3016.pdf
In the present paper, we study the kinetic theory of instability of electrostatic lower hybrid waves1 (LHWs) in a dusty plasma containing potassium positive ions (K+). A relativistic electron beam (REB) propagating through the plasma containing dust grains, positive potassium ions, and electrons, drives the LHWs to... -
T.I. Morozova (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3017.pdf
The lower-hybrid wave processes that take place under the interaction of the Earth's magnetosphere with dusty plasma near the lunar surface are considered. Lower-hybrid waves are excited in the regions of the transient magnetic and/or boundary magnetospheric layers due to the development of linear hydrodynamic instability.... -
D. Zielke (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3018.pdf
In ion sources for neutral beam heating systems used in fusion, low temperature hydrogen plasmas are sustained by inductive RF coupling in compact cylindrical discharges of several dm3. The sources are typically operated at low pressures up to 0.3 Pa and powers of 100 kW yielding power densities of 10 MW/m3 to reach plasma... -
A. Tamman (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3019.pdf
Advantages of X-ray which is emitted by dense plasma focus (DPF) are high-speed shutter and high energy. It can be used as a tool for researching on the property and structure of an object with high speed movement such as turbine blade. This is the target research for Thailand Plasma 1 (TPF-1). The X-ray yield strongly... -
Z. Luo (EPS 2019)09/07/2019, 14:00LTPD
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3020.pdf
Monolayer 2D materials, including graphene and transition metal dichalcogenides (TMDs) are promising materials for applications in optoelectronics. In our laboratory, we have developed a series of strategies to synthesis high-quality graphene and TMDs layers, as well as their heterostructure, with tuneable properties using... -
G. Dobrev (EPS 2019)09/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3021.pdfWe present experimental investigations of the transport properties of NiH radical in molecular hydrogen gas. We use NiH to model the behaviour of the first row transition metal monohydrides (e.g. CrH, FeH,TiH) that are established markers for cool stellar atmospheres - i.e. M, L, T-type stars. The data presented here...
Go to contribution page -
D. Sciacqua (EPS 2019)09/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.3022.pdfPlasma enhanced chemical vapour deposition (PECVD) is a technique that originates from the conventional chemical vapour deposition (CVD). PECVD is a technique that allows in particular the deposition of ultra-thin and pinhole free polymer films on a great class of substrates. The main role of cold plasmas in this...
Go to contribution page -
V. Pavlenko (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4001.pdf
Flute oscillations are vortical motions which are highly elongated along the magnetic field. Their characteristic dimensions are much larger than the Larmor radius, and their frequency much smaller than the cyclotron frequency, of the ions. In contrast to the electrostatic drift wave, the flute mode belongs to the reactive... -
R. Gueroult (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4002.pdf
The question of how to impose an electric field perpendicular to the magnetic field in a highdensity magnetized plasma is central to a variety of applications with high societal impact. In recent years, it has been shown for instance that "crossed-field" rotating configurations could offer unique opportunities both for... -
M. Romé (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4003.pdf
The dynamics of a two-dimensional (2D) inviscid and incompressible fluid can be conveniently studied using a strongly-magnetized pure electron plasma confined in a PenningMalmberg trap, thanks to a mathematical analogy where the fluid velocity is equivalent to the plasma E × B velocity, and fluid vorticity and stream... -
G. Maero (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4004.pdf
Penning-Malmberg traps are known and extensively used as unique tools for long-term charged particles storage, precise manipulation and measurement of trapped samples, creation of highquality bunched beams [1]. This array of opportunities results from decades of theoretical and experimental studies of the dynamical and... -
S. Hosseini Jenab (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4005.pdf
The newly developed concept of supersolitary wave (supersoliton) describes a novel type of nonlinear localized structure. Its signature features are a very large amplitude in the electrostatic potential (pulse) and a characteristic wiggly structure in the associated electric field. Firstly, supersolitons were suggested in... -
R. Dhawan (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4006.pdf
Plasma is a multi-component gas, composed of ions, electrons and neutrals. Therefore, collisions between different plasma species must be entertained. Moreover, energy and momentum are redistributed by their presence in the plasma. The presence of negative ions in the system has a huge impact on the characteristics of... -
P.K. Barnwal (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4007.pdf
This paper reports the behavior of anode sheath in a planar dc discharge system brought about by changing the plasma boundary. Asymmetric parallel electrodes (anode dia. = 38 mm, cathode dia. = 76 mm, separation = 35 mm) were placed in a glass tube and covered by mica discs at the two ends of the glass tube. The whole... -
P.J. Rathod (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4008.pdf
An experimental system SYMPLE (System for Microwave Plasma Experiments) is developed to investigate interaction of high power microwave (HPM) with an over-dense plasma ( plasma > microwave) to address the physics of various linear and non-linear mechanisms related to wave absorption in plasma1. A washer-gun based pulsed... -
P. Alex (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4009.pdf
A double plasma device comprising of two isolated SS304 chambers namely, source and target plasma chambers is used to develop understanding on mechanism involved in realizing a control on electron temperature in the target region. Electron temperature is controlled locally as well as radially by charging a single grid and... -
L. Valvo (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4010.pdf
Guiding Centre theory refers to the problem of finding an exact description for the motion of a charged particle in a given magnetic field. Recently, a new, exact, approach to guiding centre theory has been proposed [1], [2]. In this new approach the guiding centre is defined geometrically as the reference frame in which a... -
Huasheng Xie (EPS 2019)09/07/2019, 14:00
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4011.pdfA unified numerically solvable framework for dispersion relations with an arbitrary number of species drifting at arbitrary directions and with Krook collision is derived for linear uniform/homogenous kinetic plasma, which greatly extended the standard one [say, T. Stix, {\em Waves in Plasmas}, AIP...
Go to contribution page -
L. Simonchik (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4012.pdf
A number of effects, such as anomalous backscattering and anomalously ion acceleration, observed in experiments on electron-cyclotron resonant heating (ECRH) in magnetic fusion toroidal devices [1-2] are not explained within the conventional linear theory. The theoretical model proposed in [3] explains the anomalous... -
A.A. Kulichenko (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4013.pdf
The phenomena of nonlocal (superdiffusive) transport are closely related to long-free-path carriers, called «Lévy flights» by B. Mandelbrot (see [1] and references therein). The processes of non-local transport with account of the finite velocity of carriers (i.e. of the retardation effect) are called «Lévy walks» [2, 3],... -
D. Mandal (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4014.pdf
In Hall thruster geometry, the electric and magnetic field configuration creates a huge difference in drift velocity between electrons and ions, which generates electron cyclotron drift instability or E × B electron drift instability[1]. Unstable modes generated from this instability have an important role in cross-field... -
A. Mustafaev (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4015.pdf
Low-temperature plasma finds a wide practical application in devices used in the current control circuits of space and ground-based nuclear power plants: modulators, thermionic converters, current and voltage stabilizers and etc. One of the most important requirements for devices of such appointment is the ability of... -
R. Bingham (EPS 2019)09/07/2019, 14:00BSAP
See full abstract here:
Go to contribution page
http://ocs.ciemat.es/EPS2019ABS/pdf/P2.4016.pdf
In many plasma applications, electromagnetic (EM) waves are key to providing energy. Plasmas can demonstrate complex dynamics when exposed to multiple EM signals. Raman coupling (by Langmuir oscillation) or Brillouin scattering (through ion-acoustic waves) are important in laser plasma interactions: Microwave beams can be... -
M. van Berkel (EPS 2019)09/07/2019, 16:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.104.pdf
In perturbative experiments, the power deposition profile is a crucial ingredient in the analysis of the (turbulent) transport [1, 2]. Typically, the deposition profile is calculated with a forward model and used for the computation of the transport [3, 4, 5]. We will show that allowing for uncertainties in the...
Go to contribution page -
G. Cantono (EPS 2019)09/07/2019, 16:30BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.201.pdf
Experiments of laser-solid interaction at ultra-high contrast have recently demonstrated the possibility of exciting resonant propagating surface plasmons at relativistic intensities (> 10^18 W/cm^2) on solid grating targets [1]. Not only this encourages the development of a suitable theoretical description of plasmonic...
Go to contribution page -
E.V. Johnson (EPS 2019)09/07/2019, 16:30Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J701.pdf
Since the pioneering work of the Bochum team on exciting plasmas with non-sinusoidal "Tailored" Voltage Waveforms and generating an Electrical Asymmetry Effect [1], the complexity and power of this technique has come into clearer focus. By decoupling the ion bombardment energy from the ion and radical flux at the...
Go to contribution page -
N. Vilmer (EPS 2019)09/07/2019, 16:30BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J801.pdf
Efficient particle acceleration is produced in association with solar flares. These particles play a major role in the active Sun because they contain a large amount of the magnetic energy released during flares. Energetic electrons and ions interact with the solar atmosphere and produce high-energy X-rays and -rays....
Go to contribution page -
R. McDermott (EPS 2019)09/07/2019, 17:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.105.pdf
Impurities are unavoidable in fusion plasmas and potentially highly problematic as they result in fuel dilution and radiative energy losses. Accurate predictions of fusion plasma performance, therefore, require a validated theoretical description of impurity transport, which in turn requires high accuracy measurements...
Go to contribution page -
N. Lemos (EPS 2019)09/07/2019, 17:00BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.202.pdf
X-ray photon beams in the keV to MeV energy range are essential to study high energy density (HED) matter and to improve the understanding of inertial confinement fusion and astrophysical systems. HED experiments produce highly transient matter under extreme states of temperatures and pressures and it is essential to...
Go to contribution page -
A. Milella (EPS 2019)09/07/2019, 17:00Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J702.pdf
Nanotextured metal and metal oxide thin films are of interest for an increasing number of catalytic applications ranging from fuel cells to photoelectrochemical water splitting, from photochemical wastewater treatment to biodiesel production. The need for enhanced performance and versatility has correspondingly...
Go to contribution page -
P. Antolin (EPS 2019)09/07/2019, 17:00BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J802.pdf
The complex interaction of the magnetic field with matter is the key to some of the most puzzling observed phenomena at multiple scales across the universe, from tokamak plasma confinement experiments in the laboratory to the filamentary structure of the interstellar medium. King among these is the phenomenon of...
Go to contribution page -
K. Tanaka (EPS 2019)09/07/2019, 17:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.106.pdf
In LHD, hydrogen and deuterium isotope experiments were extensively carried out from the 2017 experimental campaign. In ECRH plasma, positive isotope effects in global energy confinement time taoE ECH proportional to A^(0.22±0.01) ne bar ^(0.60±0.01) Pabs^(-0.51±0.01) and negative isotope effects in global particle...
Go to contribution page -
E. Pawelec (EPS 2019)09/07/2019, 17:30Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J703.pdf
In the fusion plasma reactors most of the plasma is contained in the hot core. Nevertheless, there is a cold outer layer of plasma in the vicinity of the walls, which is crucial to the survival of the plasma vessel and therefore the reactor itself. This layer is cold enough to have a significant molecular component,...
Go to contribution page -
A. Verdini (EPS 2019)09/07/2019, 17:30BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J803.pdf
The solar wind is a supersonic turbulent flow that spreads out radially form the Sun. Several spacecrafts explored different regions of the Heliosphere and provide us in-situ data of plasma and electromagnetic fluctuations from daily to sub-second scales. The solar wind can be though as a wind tunnel in which...
Go to contribution page -
A. Andreev (EPS 2019)09/07/2019, 17:30BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.201.pdf
Recently we have proposed an efficient scheme of generation of short dense electron bunches and atto-pulses during the interaction at large angles of incidence of a laser pulse with a limited foil target [1]. Later [2], the generation of high-intensity atto-pulses has been investigated also in a hollow cone-like target....
Go to contribution page -
V. Annenkov (EPS 2019)09/07/2019, 17:45BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.202.pdf
It was found recently [1] that counterpropagating plasma wakefields driven by a pair of femtosecond laser pulses with different transverse structures can produce powerful and narrowband EM emission near double plasma frequency. Such a nonlinear process can proceed in a homogeneous plasma, does not require the creation...
Go to contribution page -
A. Uccello (EPS 2019)09/07/2019, 18:00Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I2.J704.pdf
Tokamak experiments approaching thermonuclear conditions, like ITER, must face seriously the safety issues related to the release of debris in dust or droplet form from the vessel first wall. In case of loss-of-vacuum accidents, there is a safety hazard due to remobilisation of inhalable toxic or radioactive dust...
Go to contribution page -
U. Plank (EPS 2019)09/07/2019, 18:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.111.pdf
Understanding the dependence of the H-mode power threshold, PLH, on the main ion composition is critical for the pre-nuclear operational phase of ITER, which will be perfomed in H and He plasmas. For pure H plasmas it is well known that PLH(H) = 2PLH(D), while in the case of pure He plasmas the results vary between...
Go to contribution page -
D. Kumar (EPS 2019)09/07/2019, 18:00BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.203.pdf
At focused intensities above 10^18 W/cm^2, a laser pulse accelerates bunches of electrons into a solid target by the v x B component of the Lorentz force. These bunches are separated by half the laser period and hence emit visible light by coherent transition radiation (CTR) at twice the laser frequency (20) as they...
Go to contribution page -
C. Forest (EPS 2019)09/07/2019, 18:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.J801.pdf
In 1958, Eugene Parker first predicted the existence of the supersonic solar wind [1], which was subsequently verified by early spacecraft missions [2]. He also theorized how this solar wind interacts with the dynamo-generated magnetic field of the Sun - carrying the magnetic field lines away from the star, while their...
Go to contribution page -
E. Caschera (EPS 2019)09/07/2019, 18:15MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.112.pdf
Turbulent transport and its impact on ITER performance is investigated with the global flux-driven gyrokinetic code GYSELA. In that framework, a heat source, balanced by turbulent cross-field transport, determines the temperature profile. It is expected that the heat sink at the boundary and turbulence in the edge may...
Go to contribution page -
A. Bemporad (EPS 2019)09/07/2019, 18:15
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O2.J802.pdf
Over the last decades the availability of continuous observations of the solar atmosphere (the corona) from space allowed to study in great details solar eruptions, namely Coronal Mass Ejections (CMEs; see review by Webb & Howard 2012). For major CMEs it was shown (Vourlidas et al. 2003; Ontiveros & Vourlidas 2009)...
Go to contribution page -
P. Muggli (EPS 2019)10/07/2019, 09:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.007.pdf
Relativistic proton bunches available today carry large amounts of energy (tens to hundreds of kilojoules) and can thus, in principle, drive wakefields in long plasmas, possibly leading to the acceleration of electrons to very high energies (TeVs). Since these bunches are long (6 to 12 cm), the self-modulation process...
Go to contribution page -
O. Grulke (EPS 2019)10/07/2019, 09:35MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.008.pdf
Stellarators have intrinsic advantages with respect to a fusion reactor operating in steady-state. They, however, need optimization to bridge the gap to tokamak plasma performance. The superconducting stellarator Wendelstein 7-X (W7-X) is optimized for neoclassical transport and improved plasma stability. The set of 50...
Go to contribution page -
O. Schmitz (EPS 2019)10/07/2019, 10:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.101.pdf
The island divertor concept is an innovative and promising idea to handle heat and particle exhaust in stellarators. At the recently started stellarator Wendelstein 7-X, this divertor concept plays a central role in the device mission to demonstrate reactor relevant plasma confinement for steady-state time scales of up...
Go to contribution page -
V. Smalyuk (EPS 2019)10/07/2019, 10:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.201.pdf
In Inertial Confinement Fusion (ICF), an indirectly driven implosion begins with an acceleration phase when the hohlraum x-rays ablate the shell surface and the capsule starts to converge. At this stage, outer-shell non-uniformities grow due to the acceleration-phase Richtmyer-Meshkov (RM) and Rayleigh≠Taylor (RT)...
Go to contribution page -
R. Rincón (EPS 2019)10/07/2019, 10:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.301.pdf
The study of ethanol decomposition process to synthesize few-layers graphene together with hydrogen using an argon microwave plasma sustained by a Torche à Injection Axiale sur Guide d'Ondes opened to the atmosphere is presented. In this work, plasma kinetics and by-products formation are deeply studied to identify the...
Go to contribution page -
A. Noble (EPS 2019)10/07/2019, 10:40BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.401.pdf
A charged particle moving through a medium emits Cherenkov radiation when its velocity exceeds the phase velocity of light in that medium. Since light in vacuum is usually assumed to move at the universal speed c, causality appears to preclude vacuum Cherenkov radiation (VCR). Under the influence of a strong...
Go to contribution page -
J.A. Alonso (EPS 2019)10/07/2019, 11:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.102.pdf
Two of the highest priorities in stellarator research are to verify the effects of orbit driftoptimization on the energy core confinement and to learn to prevent the accumulation of impurities in high-density plasmas. The basic framework for understanding energy and particle transport in these devices is neoclassical...
Go to contribution page -
S. Depierreux (EPS 2019)10/07/2019, 11:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.202.pdf
The direct and indirect drive schemes to ICF make use of a large number of laser beams arranged in a symmetric angular distribution. The preferential decay geometry of the three waves resonant couplings, mainly responsible for backscattered light in single beam experiments, may then be deeply modified in the region of...
Go to contribution page -
S. Samukawa (EPS 2019)10/07/2019, 11:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.302.pdf
Securing safe and cheap energy and using it effectively is a serious problem for modern society. As a solution to this, he is performing research on innovative green nanodevices. We are developing power generating devices, storage devices, low-power-consumption devices, multifunction Nano-devices and nano-energy systems...
Go to contribution page -
S. Servidio (EPS 2019)10/07/2019, 11:10BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.402.pdf
Plasma turbulence has been investigated using unprecedented high-resolution ion velocity distribution measurements by the Magnetospheric Multiscale mission (MMS) in the Earth's magnetosheath. This novel observation of a highly structured particle distribution suggests a cascadelike process in velocity space [1], as...
Go to contribution page -
K. Falk (EPS 2019)10/07/2019, 11:40BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I3.403.pdf
We present the first measurement of nonlocal electron transport on Warm Dense Matter (WDM) [1]. The experiment was carried out at the OMEGA laser facility, where we used 15 beams drove a fast compression wave in low-density CH foam generating WDM conditions. We combined multiple independent diagnostics including...
Go to contribution page -
N.A. Pablant (EPS 2019)10/07/2019, 11:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.101.pdf
The role of the radial electric field in high performance ion-root plasmas on Wendelstein 7-X (W7-X) is examined and compared with neoclassical predictions. In stellarator plasmas the neoclassical radial electric field (Er) is not intrinsically ambipolar, and is instead strongly tied to the plasma profiles. The...
Go to contribution page -
K. Glize (EPS 2019)10/07/2019, 11:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.201.pdf
Shock ignition is a promising route for laser fusion ignition; in principle high fusion energygain can be achieved with modest driver energies and hence capital investment.
This talk will detail both simulations and ongoing collaborative experiments on the Omega, and NIF laser facilities. These are being performed both...
Go to contribution page -
A. Siasko (EPS 2019)10/07/2019, 11:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.301.pdf
Constriction, which is the fundamental phenomenon of gas discharge physics, has been attracting the attention of scientists for more than a century. However, scientists still discuss [1], what is the main mechanism, which leads to a constriction. Among all mechanisms one can name the inhomogeneous heating of a neutral...
Go to contribution page -
T. Oishi (EPS 2019)10/07/2019, 11:55MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.102.pdf
The ergodic layer located at the plasma edge of Large Helical Device (LHD) consists of stochastic magnetic fields with three-dimensional structure intrinsically formed by helical coils. Reduction of impurity penetration into confinement region due to existence of the ergodic layer, so called "impurity screening", has...
Go to contribution page -
G. Ren (EPS 2019)10/07/2019, 11:55BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.202.pdf
We design an octahedral spherical hohlraum with 6 laser entrance holes (LEHs) for the Rev. 6 Be ignition capsule [A. N. Simakov et al., Phys. Plasmas 21, 022701 (2014)]. With an Au spherical hohlraum of 4400 $\mu$m in radius and six LEHs of 1200 $\mu$m in radius, a laser pulse of 2.15 MJ energy and 630 TW power is...
Go to contribution page -
M. Snirer (EPS 2019)10/07/2019, 11:55LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.302.pdf
Microwave (MW) discharges are one of the most flexible plasma devices operating under wide range of experimental conditions which makes them suitable for many practical applications. However, at atmospheric pressures, the plasmas tend to contract, forming the spatially inhomogeneous and possibly temporally unstable...
Go to contribution page -
K. Nagasaki (EPS 2019)10/07/2019, 12:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.103.pdf
Energetic alpha particles generated by D-T fusion reaction and beam ions for plasma heating interact resonantly with shear Alfvén waves through damping process when their velocity is comparable with Alfvén velocity, resulting in excitation of energetic particle (EP)-driven MHD instabilities. Several types of EP-driven...
Go to contribution page -
P.A. Amendt (EPS 2019)10/07/2019, 12:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.203.pdf
In indirect-drive inertial confinement fusion (ICF) a high-Z enclosure (or "hohlraum") surrounds a low-Z capsule containing DT fuel inside a low-Z spherical shell. Laser beams irradiate the interior of the hohlraum through a pair of laser entrance holes, in turn creating an x-ray radiation "bath" that compresses the...
Go to contribution page -
V. Nosenko (EPS 2019)10/07/2019, 12:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.303.pdf
Two-dimensional (2D) complex plasma crystals are popular model systems where various generic as well as plasma-specific phenomena can be studied in real time at the level of individual particles. System-size dependence of the plasma crystal properties is an important issue which is not fully understood due to the...
Go to contribution page -
J. Horn-Stanja (EPS 2019)10/07/2019, 12:10BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.401.pdf
Magnetic dipole fields have exellent confinement properties for charged particle ensembles with an arbitrary degree of neutrality. One idea to create a magnetized low-energy electron-positron pair plasma pursued by the APEX/PAX collaboration relies on the initial formation of a non-neutral plasma in the confining...
Go to contribution page -
P.T. Lang (EPS 2019)10/07/2019, 12:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.104.pdf
Operation in a future fusion reactor will aim to establish a high plasma core density n0 in order to harvest a maximum output power. Hence, for example the near term EU-DEMO1 concept foresees operation at n0 values at or even beyond 1.2 the Greenwald density nGw. Like for most envisaged reactor scenarios this approach...
Go to contribution page -
R. Riquier (EPS 2019)10/07/2019, 12:25BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.204.pdf
For the last couple of years, large efforts have been invested at CEA/DAM to develop the 3D radiationhydrodynamics code TROLL. Indeed, 2D radhydro codes are the main tool to design and analyze HED and ICF experiments. Yet, many of the first are intrinsically 3D, for example: few laser beams in directdrive or study...
Go to contribution page -
A. Jagodar10/07/2019, 12:25
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/O3.304.pdfPlasmas can be used for the fabrication of novel materials. The interest in novel, often carbonaceous materials with large effective surfaces, high conductivity, stability, is growing due to the downsizing of electrical devices and the demand for low-cost new materials. In particular this...
Go to contribution page -
D.F. Minenna (EPS 2019)10/07/2019, 12:25BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.402.pdf
Nonlinear synchronisation is a key process in wave-particle interaction [1], responsible for Landau damping as well as for the amplification in devices like traveling wave tubes and gyrotrons [2]. We investigate it using the finite-N approach from a self-consistent hamiltonian formalism [3]. This description is combined...
Go to contribution page -
S. Bozhenkov (EPS 2019)10/07/2019, 12:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.105.pdf
High-density operation is an attractive target for a fusion reactor, as it raises the fusion power output. Stellarators are especially suitable for such a regime, because they are not restricted by the disruptive density limit and because their energy confinement is roughly proportional to the square root of the...
Go to contribution page -
A. Ruocco (EPS 2019)10/07/2019, 12:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.205.pdf
The shock ignition (SI) approach to inertial confinement fusion promises ignition at a lower laser energy than conventional hotspot schemes. The target is initially driven at a low-implosion velocity, which reduces hydrodynamic instabilities, and then ignited by a high-intensity spikethat launches a strong shock into...
Go to contribution page -
T. Ravensbergen10/07/2019, 12:40
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/O3.305.pdfOne of the major challenges in realizing a commercially viable fusion reactor is the handling of the power and particle exhaust into the divertor of most used magnetic configurations today. A proposed approach isoperation in the so-called detached regime. An actuator, often local neutral gas...
Go to contribution page -
V.V. Kocharovsky (EPS 2019)10/07/2019, 12:40BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O3.403.pdf
In laser plasmas, as well as in solar and stellar winds, ions and electrons can have comparable energies and strongly anisotropic velocity distributions. Under those conditions both fractions of a collisionless plasma can make a significant contribution to the development of the Weibeltype instability and the subsequent...
Go to contribution page -
K. Ferriere (EPS 2019)11/07/2019, 09:00BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.010.pdf
The interstellar medium is a multi-phase, magnetized, and highly turbulent medium. In this talk, I will address both theoretical and observational aspects of interstellar turbulence. In the first, theoretical part of the talk, I will discuss the sources of turbulence, the properties of the turbulent cascade, the...
Go to contribution page -
T. Grismayer (EPS 2019)11/07/2019, 09:35
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.011.pdf
Plasma physics generally involves well-known physics of electromagnetism, special relativity and statistical mechanics. Various descriptions of the plasma state (kinetic, fluid, MHD) have been developed and each of them have a specific scope that depends on time/length scales, chemical composition, density, and...
Go to contribution page -
E. Viezzer (EPS 2019)11/07/2019, 10:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.101.pdf
Recent advances in the diagnostic capabilities at ASDEX Upgrade (AUG) allow us to measure the edge profiles on a sub-ms timescale and with a spatial resolution of less than 5 mm. This makes it ideal to study the profile recovery during fast transient events. Here, we present the dynamic behaviour of the energy, particle...
Go to contribution page -
N. Iwata (EPS 2019)11/07/2019, 10:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.201.pdf
With the development of kJ, petawatt (PW) class lasers, laser pulses with relativistic intensities (>= 10^18 W/cm^2) and over-picosecond (ps) pulse durations are becoming available. In such a ps relativistic regime, the energy transfer enters in a new regime as indicated by the recent multi-ps PW laser experiments,...
Go to contribution page -
S. Longo (EPS 2019)11/07/2019, 10:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.301.pdf
Modelling of vibrational kinetics of molecules in a plasma environment is a very important and interdisciplinary topic linking plasma physics to chemical physics and has applications to clean energy issues, materials science and space exploration. In particular, CO2 is presently under widespread investigation in the...
Go to contribution page -
A. Tenerani (EPS 2019)11/07/2019, 10:40BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.401.pdf
Large amplitude, turbulent Alfvénic fluctuations have been commonly observed in the solar wind since the first in-situ measurements. An important but still unexplained property of such nonlinear fluctuations seen typically in the fastest streams is that, despite the large excursion of the magnetic field fluctuations,...
Go to contribution page -
D. Hatch (EPS 2019)11/07/2019, 11:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.102.pdf
An ITER-like wall (ILW), composed of a tungsten divertor and beryllium chamber, was installed on JET in order to study material erosion and tritium retention in preparation for ITER. The ILW has successfully demonstrated long-term tritium retention but has had an unexpected impact on confinement via its effect on the...
Go to contribution page -
P. Hilz (EPS 2019)11/07/2019, 11:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.202.pdf
Mass-Limited Targets (MLT) represent an interesting option for many applications, based on laser-plasma interactions. Various theoretical studies investigated MLT's extensively. Experimental verification of these schemes is extremely demanding, due to the technological challenges on targetry and requirements on the...
Go to contribution page -
D. Told (EPS 2019)11/07/2019, 11:10BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.402.pdf
One of the most eminent unsolved problems in space plasma physics is the nature of turbulent energy dissipation at small spatial scales, which is thought to explain the heating of the heliospheric plasma that has been consistently observed through space craft measurements[1].
Go to contribution page
Three-dimensional kinetic simulations... -
V. Kozhevnikov (EPS 2019)11/07/2019, 11:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.301.pdf
In 2016 the group of experimentalists led by Eduard Sosnin in the Institute of High Current Electronics has been discovered a new phenomenon in gas discharge physics: an extended plasma jet developing perpendicular to the bending point of the arc discharge channel between two electrodes (E.A. Sosnin et al., JETP Lett.,...
Go to contribution page -
S.A. Khrapak (EPS 2019)11/07/2019, 11:25LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.302.pdf
The purpose of this paper is to present simple and accurate practical expressions to estimate the viscosity and self-diffusion coefficients of three-dimensional Yukawa fluids in a wide parameter regime. The expression for the viscosity coefficient is based on a freezing temperature's scaling discussed recently by...
Go to contribution page -
T. Huang (EPS 2019)11/07/2019, 11:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J501.pdf
The nonlinear synchrotron radiation of direct laser-accelerated electrons in nearcritical density (NCD) plasmas recently has been proposed as a very efficient scheme to produce multi-MeV gamma-rays [1]. In this presentation, we demonstrate that by employing a plasma density channel, the divergence angle and transverse...
Go to contribution page -
I. Dodin (EPS 2019)11/07/2019, 11:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J601.pdf
Inhomogeneous drift-wave turbulence with zonal flows (ZFs) can be modeled as effective quantum plasma where the ZF velocity serves as a collective field [1, 2]. This effective plasma can be described, quite intuitively, by a Wigner-Moyal kinetic equation (WMKE), which was originally introduced as phase-space...
Go to contribution page -
A. Ashourvan (EPS 2019)11/07/2019, 11:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.101.pdf
We observe the formation of a high-pressure staircase pedestal (~16-20 kPa) in high beta p plasmas (beta p>1.5) in the DIII-D tokamak when large amplitude ELMs are suppressed using resonant magnetic perturbations (RMP). The pedestal cyclically transitions from a one-step structure to a wider two-step staircase...
Go to contribution page -
G. Lehmann (EPS 2019)11/07/2019, 11:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.201.pdf
The manipulation of intense laser fields by solid-state devices is severely limited due to nonlinearities and damage threshold issues as the fluence of high-intensity laser pulses is more than five orders of magnitudes larger than what conventional materials can sustain. In recent years, novel concepts how structured...
Go to contribution page -
L. Horvath (EPS 2019)11/07/2019, 11:55MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.102.pdf
A strong, favourable isotope dependence of the energy confinement (tao E,th ~ A^0.4) has been found in Hydrogen (H) and Deuterium (D) JET-ILW type I ELMy H-modes, originating at the pedestal [1]. Also, the plasma density is systematically lower in H than in D plasmas [1]. This contribution examines the isotopic...
Go to contribution page -
G. Raj (EPS 2019)11/07/2019, 11:55BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.202.pdf
During laser-solid target interactions, the onset of Weibel instability can generate super-strong magnetic field structures (up to several tens of MG) on the surface and within the bulk of the solid targets. Such magnetic fields can be used to understand several physical events in astrophysics such as blast wave shocks...
Go to contribution page -
F. Manke (EPS 2019)11/07/2019, 12:10Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.J602.pdf
Fast ions denote a part of the ion population of a plasma that exhibits speeds far above the thermal average. They appear in astrophysical plasmas, e.g. as Solar Energetic Particles (SEPs)[1]. In fusion plasmas, fast ions originate from fusion reactions or neutral beam injection and their confinement is crucial to the...
Go to contribution page -
A. Diallo (EPS 2019)11/07/2019, 12:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.103.pdf
We report on recent investigations in DIII-D of three-wave interactions between pedestal modes during quasi-stationary inter-ELM phases leading up to the type I ELM onset. Prior to eruptive events such as ELMs, these pedestal modes, also called quasi-coherent fluctuations, are observed in the edge of fusion devices[1]....
Go to contribution page -
T. Frazer (EPS 2019)11/07/2019, 12:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.203.pdf
A study of the influence of laser focal spot size on the acceleration of protons at intensities up to 5 x 10^21 Wcm^-2 is presented. Through the use of ellipsoidal, F/1 focusing plasma mirrors, focal spot sizes (~ 1.5 µm) on the order of the laser wavelength (1.054 µm) are achieved [1, 2]. Results are compared with...
Go to contribution page -
L. Friedland (EPS 2019)11/07/2019, 12:10Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J501.pdf
We study formation of large amplitude standing ion acoustic waves (SIAW) by nonlinear phase-locking (autoresonance) with a weak, chirped frequency standing ponderomotive drive. These waves comprise a nonlinear two-phase solution each phase locked to one of the two traveling waves comprising the drive. The autoresonance...
Go to contribution page -
G.F. Harrer (EPS 2019)11/07/2019, 12:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.104.pdf
In future fusion devices the collisionality Nue proportional to ne/Te^2 at the pedestal top will be very low, i.e. nue,pedtop ∼0.06 [1], due to the expected high temperature. On the other hand at the very edge it should be high, nu*e,sep ∼12, because a high separatrix density is necessary for efficient power exhaust....
Go to contribution page -
L. Fedeli (EPS 2019)11/07/2019, 12:25BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.204.pdf
Achieving a light source delivering intensities up to the Schwinger limit of 10^29W/cm^2 would allow exploring novel regimes of strong-field Quantum ElectroDynamics (QED) where vacuum would be ripped apart. A promising candidate to build such a light source would be to find a realistic implementation of the Curved...
Go to contribution page -
E.R. Tubman (EPS 2019)11/07/2019, 12:25Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J502.pdf
Magnetic reconnection is a phenomenon which is of great interest to many researchers because of both its application to astrophysical situations and potential effects within hohlraum geometries. Laser-solid interactions allow a reconnection region to be generated in between laser spots, as previously investigated by...
Go to contribution page -
G. Blaclard (EPS 2019)11/07/2019, 12:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.205.pdf
The interaction of intense laser beams with plasmas created on solid targets involves a rich non-linear physics. Because such dense plasmas are reflective for laser light, the coupling with the incident beam occurs within a thin layer at the interface between plasma and vacuum. One of the main paradigms used to...
Go to contribution page -
O. Budriga (EPS 2019)11/07/2019, 12:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.J503.pdf
Re-entrant cone was so far mainly used in the high energy density physics research especially in the laser fusion and has been proven to have an effective control on the fast electrons mainly for the fast ignition research [1]. Sentoku has shown that the re-entrant cone can increase the laser intensity up to 20 times...
Go to contribution page -
A. Marinoni (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1001.pdfThis work presents initial results of the development of a Phase Contrast Imaging (PCI) diagnostic operating with a probe wavelength of 1.55 µm. While worldwide PCI systems use a 10.6 µm probe laser to relax technical constraints on the interferometric measurement, this reduced wavelength would permit new capabilities...
Go to contribution page -
E. Panontin (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1002.pdfPhase-space tomography is an established technique for inferring physical properties (namely temperature, density and drift velocity) of thermal species in fusion plasmas. Consistent efforts have already been made to extend those techniques to fast ions generated by fusion reactions or auxiliary heating in order to...
Go to contribution page -
A. Podolnik (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1003.pdfTokamak COMPASS Upgrade will be a high-field high-density fusion experiment aimed also at investigation of advanced divertor scenarios. One of proposed diagnostic systems is based on time-proven technique of Langmuir probe measurements. However, to operate these probes in the harsh environment of such machine, specific...
Go to contribution page -
A.S. Prishvitcyn (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1004.pdfLithium is the most promising liquid metal, considered as potential for plasma-facing elements. It was experimentally shown, that the use of lithium in tokamaks increases plasma confinement time, decreases the amount of impurities in the plasma, and decreases hydrogen recycling on the plasma facing components. Experiments...
Go to contribution page -
3382. P4.1005 Application of Laplacian Eigen Functions for the tomographic reconstruction of tokamakS. Purohit (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1005.pdfThe estimation of 2D plasma emission profile via tomographic reconstruction inherits the ill-posed inversion characteristic and is constrained by the limited number of plasma observations sights/directions. Such complex estimation is carried out by special mathematical treatments like the series expansion method....
Go to contribution page -
P.A. Sdvizhenskii (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1006.pdfPredictive modeling of passive signal of tokamak edge plasma charge-exchange recombination spectroscopy (CXRS) diagnostics remains a problem because of the necessity to combine solutions of theoretical problems, which need sophisticated numerical modeling. This includes: (i) modeling of the SOL(+divertor) plasma with...
Go to contribution page -
C. Shen (EPS 2019)11/07/2019, 14:00MCF
See ful abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1007.pdfThe accuracy of measuring Magnetohydrodynamic (MHD) instabilities by inductive loops (formed as Mirnov probes and saddle loops on J-TEXT) is significant affected by the eddy current, which determined by the placement of the inductive loops and the material of the conductors nearby. In various frequency range, e.g. high...
Go to contribution page -
P. Svihra (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1008.pdfA 3D model of transport and interaction of particles with tokamak components using Geant4 toolkit is presented. Main goal was to analyse impact of population of relativistic electrons on vacuum vessel and other critical components. These so-called runaway electrons (RE) behave like in a particle accelerator and can cause...
Go to contribution page -
N. Teplova (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1009.pdfFilamentary-like plasma perturbations are routinely observed in many tokamaks. They are the result of non-linear development of some peripheral MHD instabilities in the region of the maximum plasma pressure gradient [1]. As soon as filaments can play a key role in the anomalous transport of particles and energy at plasma...
Go to contribution page -
M. Tunkl (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1010.pdfThe runaway electrons have serious detrimental effects on the vacuum components of tokamaks. They emerge during plasma disruptions and the energy of accelerated electrons can reach the order of tens of MeV. Recent advances in semiconductor detectors allowed their widespread application in high-temperature plasma...
Go to contribution page -
A. Cremona (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1012.pdfA non-intrusive diagnostic based on Optical Emission Spectroscopy (OES) is under study in GyM for measurements of electron temperature (Te) and density (ne) to complement Langmuir probes. This technique provides values of Te and ne averaged along the line-of-sight through the analysis of spectral line pairs, as emitted by...
Go to contribution page -
D. Cruz Zabala (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1013.pdfA detailed characterization of flows, density and temperature profiles is necessary to shed light on transport in magnetically confined fusion devices. The most common technique to measure these profiles is Charge Exchange Recombination Spectroscopy (CXRS). The CXRS systems are usually located at the low field side but...
Go to contribution page -
K.D. Lawson (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1014.pdfHelium is widely used in laboratory fusion experiments both as a fuel, for example in the first phase of ITER, as a minority gas for some RF heating schemes and will occur as ash from the thermonuclear reactions. In order to make reliable predictions for future devices and analyse discharges produced in ITER's non-nuclear...
Go to contribution page -
T. Nishizawa (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1015.pdfMitigating head load on the divertor target is considered as one of the critical challenges to achieve a commercial fusion reactor. Fortunately, both density and temperature at the divertor target can be reduced significantly through a process called "detachment", leading to tolerable heat flux. However, our current...
Go to contribution page -
N. Offeddu (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1016.pdfUnderstanding turbulence and anomalous transport in tokamaks remains an important open issue in plasma physics for fusion devices. A prominent feature of turbulence in the Scrape Off Layer (SOL) region are blobs, coherent filamentary plasma structures that drift across the magnetic field lines at high velocities (~km/s)...
Go to contribution page -
A. Perek (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1017.pdfPlasma detachment is required to reduce the particle and heat loads in the divertor of fusion experiments. Atomic and molecular processes play a crucial role in this. To study the
Go to contribution page
interplay between these processes, a novel, real-time capable, visible multispectral imaging system (MANTIS [1]) was installed on the TCV... -
S. Schmuck (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1019.pdfFor the JET tokamak, standard equilibrium reconstructions find solutions of the Grad-Shafranov equation given diverse constraints on plasma pressure and/or magnetic field [1]. The most basic reconstruction neglects plasma pressure entirely and constraints the magnetic field via measurements of pick-up coils located around...
Go to contribution page -
3397. P4.1020 The study of L-mode filament dynamics using synthetic and experimental BES diagnosticsO. Asztalos (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1020.pdfFluctuation beam emission spectroscopy (BES) is an active plasma diagnostic used for density measurements which has sufficient spatial and temporal resolution for the study of turbulent density fluctuations and associated flows. A high energy neutral beam consisting of hydrogen isotopes or light alkali metal atoms is shot...
Go to contribution page -
M. Vecsei (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1021.pdfThe Alkali Beam Emission Spectroscopy (A-BES) system is a fast time-resolution diagnostic injecting a 60 keV Sodium atomic beam through the mid-plane of the W7-X stellarator [1]. It is capable of density reconstruction with a time resolution of 50 µs and for the analysis of turbulent processes. The diagnostic was...
Go to contribution page -
S. Vincent (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1022.pdfLow frequency waves turbulence developing in magnetized plasma columns are well known to trigger important radial transport, a major issue for fusion devices [1]. We present here analysis from very fast imaging of low frequency waves in a magnetically confined plasma column, as well as concomitant measures of radial...
Go to contribution page -
Z. Yang (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1023.pdfTurbulence is important for the transport in tokamak. An eight-channel correlation electron cyclotron emission (CECE) system has been developed based on the Joint-Texas Experimental (J-TEXT) tokamak to measure the electron temperature fluctuation. With the CECE diagnostic, the relation between electron temperature...
Go to contribution page -
C. Zhou (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1024.pdfThe KelvinHelmholtz (K-H) instability has been observed by Doppler Backscattering system(DBS) in EAST H-mode operation. The frequency range of the K-H instability is
Go to contribution page
about 40-90 kHz, and is distinct in the Er fluctuation. Although it can be hardly observed in density and magnetic field fluctuation, the coherences between... -
N. Bakharev (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1025.pdfGlobus-M2 [1] is a new generation one-Tesla compact spherical tokamak with two 1 MW neutral beam injectors and 0.5 MW ion cyclotron resonance heating system. Additionally Globus-M2 is equipped with a set of new diagnostics, suitable for fast ion studies, including scanning two-neutral particle analyzer system, neutron...
Go to contribution page -
P. Sirén (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1026.pdfThe ASCOT [1] and TRANSP-NUBEAM [2] Monte-Carlo codes are the most commonly used tools for analysing fast particle and fusion product distributions in JET plasmas. Differences have been observed in the physics included in the codes and the resulting predictions, including differences between experimental and modelled...
Go to contribution page -
A.A. Teplukhina (EPS 2019)11/07/2019, 14:00MCF
Seee full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1027.pdfReliable and quantitative modelling of the behaviour of fast ions is an essential step in the ITER scenario development because of their important contribution to the plasma energy balance. The fast ion distribution strongly depends on various factors, in particular, on plasma MHD activity and on sources of plasma heating...
Go to contribution page -
A.N. Karpushov (EPS 2019)11/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1028.pdfA newly installed 1 MW 25 keV NBI (2016) combined with the ECH-ECCD system allow the TCV machine [1] to join the on-going worldwide (DIII-D, AUG, TJ-II, etc.) research for studying wave fast ion interaction phenomena of interest for burning plasmas, an important point for ITER and DEMO. Alfvén modes were observed on the...
Go to contribution page -
K. Tretiak (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1029.pdfFast ions play an important role in the heating of Tokamak plasmas, e.g. by NBI (Neutral Beam Injection) and other sources. Numerical particle trackers are employed to simulate huge numbers (often of the order of millions) of trajectories of fast ions in Tokamaks. Such simulations can require high numerical accuracy and...
Go to contribution page -
R. Coelho (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1031.pdfThe JT-60SA device offers unique conditions before ITER for the study of the interaction of energetic particles with plasma waves. With similar dimensions to JET e.g. major radius but with a slightly more elongated plasma volume, JT-60SA is a high power device where an additional heating power (including 10MW of 500keV...
Go to contribution page -
O. Kovanda (EPS 2019)11/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1032.pdfThe dependence of equilibrium properties obtained by the EFIT Grad-Shafranov equation solver on constraining input data was studied. Following sets of constraining data were supplied to EFIT: (i) minimal input (16 internal partial Rogowski coils), (ii) optimized minimal input (16 internal partial Rogowski coils with...
Go to contribution page -
L. Kripner (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1033.pdfThe equilibrium solution of the GradShafranov equation in the form of the 2D function of psi and of the F() = R Btor function and the pressure p() profile offers fundamental information about the tokamak plasma state. The combination of these functions provides complex information about the plasma such as the topology,...
Go to contribution page -
O. Linder (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1034.pdfIn current carrying fusion devices, the sudden loss of thermal energy, referred to as disruptions, poses a serious threat to the plasma vessel, as relativistic runaway electrons (REs) generated in the process may cause intense localised damage to plasma facing components. In future high-Ip devices such as ITER, the risk of...
Go to contribution page -
L. Liu (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1035.pdfBeta-induced Alfvén Eigenmodes (BAEs) destabilized by resonant magnetic perturbations (RMPs) are investigated in J-TEXT tokamak. Two kinds of BAEs are observed with RMPs of finite amplitude. One is considered as m-BAE, due to the strong correlation with magnetic island, frequency characteristic, mode number and driving...
Go to contribution page -
P. Maget (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1036.pdfThe concern about impurity migration in tokamak plasmas arises because of its considerable impact on core radiation, leading to performance degradation and potentially to confinement loss. Highly charged particles are particularly deleterious as not only their radiative emission is large but also their radial flux, since...
Go to contribution page -
W. Mao (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1037.pdfImproved H mode operation has been achieved on EAST with high using NBI and LHW. Better confinement was obtained with flat central safty factor q profile in the core area, and the minimum q is slight above unity contributing to sawteeth free plasma. Core magnetic fluctuation and current profile dynamics are provided by the...
Go to contribution page -
L. Marrelli (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1038.pdfRFX-mod is a Reversed Field Pinch device that allowed performing experiments in regimes with a plasma current up to 2 MA. Due to its low value of the safety factor (q<<1) and the central peaking of current density, the RFP is characterized by the presence of MHD modes that, in RFX-mod, are controlled by a combination of a...
Go to contribution page -
N. Marusov (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1039.pdfZonal flows (ZF) are low-frequency, predominantly electrostatic plasma oscillations ( is the poloidal wave-number, is the toroidal wave-number) widely
Go to contribution page
observed in modern toroidal magnetic plasma confinement systems, such as tokamaks and stellarators [1]. It is believed that ZFs are able to regulate the level of anomalous... -
E. Matveeva (EPS 2019)11/07/2019, 14:00MCF
See full abstratc here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1040.pdfDetermination of vessel currents magnitudes and distribution plays crucial role in understanding of mechanical loads on the machine [1]. Asymmetrical disruptions are of particular concern because they possibly cause severe asymmetric electromagnetic loads [2, 3]. For the first time plasma current asymmetries are compared...
Go to contribution page -
S. Medvedev (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1041.pdfMagnetic plasma confinement systems with conductors embedded into plasma is an important class of magnetic traps with high beta, known as Galateas [1], alternative to the mainstream toroidal system designs. As summarized in [2], Galateas are widely diversified and it provides additional reason to consider them, unlike...
Go to contribution page -
M. Nagata (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1042.pdfThe Spherical Torus (ST) is a promising candidate for an advanced fusion reactor due to the compactness. Elimination of the central solenoid coil to allow an approach to lower aspect ratio configurations requires for the non-inductive plasma start-up. The transient coaxial helicity injection (T-CHI) is a leading...
Go to contribution page -
M. Okabayashi (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1043.pdfSingle and compound helicity tearing mode (TM) responses to a rotating 3D resonant magnetic perturbation (RMP), in the presence of a static error field (EF), have been observed in the partially penetrated regime [1] of the TM unlocking bifurcation process [2] in DIII-D experiments. This regime has been proposed as a stable...
Go to contribution page -
B. Park (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1044.pdfDisruption in the TOKAMAK device is generally known as one of the most harmful events. The thermal and current quench and the consequent heat load and magnetic force on the facing components are destructive. These are relatively well conceivable because it is a consequence of the eruption of two kinds of the energies,...
Go to contribution page -
G. Pautasso (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1045.pdfThe massive injection of material into a tokamak is a technique considered for disruption mitigation. Presently, several shattered pellet injectors (SPIs) [1] are foreseen for the ITER disruption mitigation system. According to reference [2], the assimilation of 14 kPam3 of deuterium fully prevents the conversion of...
Go to contribution page -
V.V. Plyusnin (EPS 2019)11/07/2019, 14:00MCF
See full abstract herer
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1046.pdfIn tokamak-reactor, such as ITER, the generation of runaway electrons (RE) is unacceptable. Disruption Mitigation System (DMS) designed in ITER should be a reliable tool for suppression of RE and mitigate other detrimental consequences of disruptions. Elaboration of the RE database and its comprehensive analysis should...
Go to contribution page -
F. Porcelli (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1047.pdfTheoretical and experimental considerations [1] suggest that axisymmetric perturbations that are resonant at the X-point(s) of a magnetic divertor separatrix may play a role for the understanding of ELMs and their active control via "vertical kicks" [2] in tokamaks.
Go to contribution page
We present the first step in the development of an... -
V.D. Pustovitov (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1048.pdfIt is well known that the ideal MHD cannot describe the resistive wall mode (RWM) dynamics in the DIII-D tokamak [1, 2]. This is true, in particular, with respect to the rotational stabilization [1] that makes plasma stable essentially above the no-wall stability limit predicted by the ideal MHD. The uncertainty in the...
Go to contribution page -
Y. Shibata (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1049.pdfIn this study, we analyzed current quenches in 3 types of DIII-D disruptions (low-q, error field and shell pellet injection) to investigate the determination mechanism responsible for the initial phase of current quench in DIII-D tokamak. Disruptions are one of the most critical issues for realization of DEMO reactor....
Go to contribution page -
R.D. Nem (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1050.pdfIn tokamaks, the scrape-off layer between the midplane and the divertor is experimentally not well diagnosed. Specifically, there is scarce experimental comparison of the ion temperature fluctuation and little information about the parallel velocity of the plasma. To gain a better understanding of the behaviour of the...
Go to contribution page -
Y. Suzuki (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1051.pdfNonlinear dynamics of plasma termination events in stellarators are studied using a 3D nonlinear MHD simulation code. In this study, two types of plasma termination events, which are MHD instabilities driven by the pressure gradient and plasma current, are studied, respectively. In the Large Helical Device (LHD)...
Go to contribution page -
L. Vela (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1052.pdfSmooth Particle Hydrodynamics (SPH) [1] is a Lagrangian numerical method to solve the equations of hydrodynamics. It has been used by the Astrophysical community to model MHD phenomena quite successfully and it has been recently extended to include laboratory plasmas in cylindrical geometries [2]. Its Lagrangian nature...
Go to contribution page -
V. Scalera (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1053.pdfOne of the major threats for the integrity of future fusion devices are disruptions [1], i.e. events during which the plasma energy content is lost on a very fast time scale and can be released under various forms to the structures circumventing the plasma. Consequently, significant heat
Go to contribution page
loads, particle loads,... -
C. Wahlberg (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1054.pdfGeodesic acoustic modes (GAMs) of a global character are frequently observed in tokamak plasmas. While many aspects of GAMs require a kinetic treatment, the MHD model offers a suitable framework for analytically studying various global aspects of these modes, including higher-order effects of plasma shaping, plasma flows,...
Go to contribution page -
V. Weinzettl (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1055.pdfEnergetic electrons, which are foreseen to be produced during disruptions in ITER, represent a potentially dangerous threat for plasma facing components [1]. Therefore, behaviour of runaway electron (RE) beams has been studied at the COMPASS tokamak in the frame of dedicated experiments focused on their generation and...
Go to contribution page -
V. Yanovskiy (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1056.pdfFor the first time diamagnetic measurements were used to calculate poloidal current in the tokamak vacuum vessel during thermal and current quenches as was recently proposed in [1]. The experimental results are compared with analytical predictions [2] and numerical modelling with CarMa0NL code [3] considering the wall...
Go to contribution page -
3433. P4.1057 Observation of poloidally asymmetric transport during sawtooth crash on J-TEXT tokamakY. Zhou (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1057.pdfCombining with the data of the three-wave Polaris-interferometer system (Polaris), the Soft Xray array system (SXR) and the electron cyclotron emission system (ECE), it is observed that the radial transport in the region between reversed radius and mixing radius is asymmetrical, which is related to the phase of the...
Go to contribution page -
E. Alessi (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1058.pdfMagnetoHydrodynamic instabilities appear in several cases as the main cause of a disruption, since they can strongly reduce the plasma confinement and lead to a mode locking. Mode locking signals are routinely used as a disruption alarm to trigger mitigating actions. However, in order to reduce the number of disruptions...
Go to contribution page -
W. Kernbichler (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1059.pdfCorrugations of tokamak magnetic flux surfaces in the location of a kink mode and/or around the islands created by a tearing mode introduce in combination with toroidal magnetic field inhomogeneity 3D modulations of magnetic field strength within the perturbed flux surfaces and, respectively, give rise to non-ambipolar...
Go to contribution page -
G.F. Subbotin (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1060.pdfSmall scale turbulence widely treated as one of the causes of abnormal transport genesis. The variation of the turbulence amplitude at T-10 is correlated with the variations of the particle flow mainly [1]. The enhanced heat transport with quick reduction along the time was observed during "ballistic" stage and typical...
Go to contribution page -
P. Piovesan (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1061.pdfRFX-mod (R = 2 m, a = 0.459 m) is the largest Reversed Field Pinch experiment which allowed characterizing the RFP plasmas up to currents of 2MA. Improved plasma performances are obtained when, in the resonant part of the m=1 spectrum, one dominant Tearing Mode is much higher than the other secondary ones (Quasi Single...
Go to contribution page -
A.V. Sudnikov (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1062.pdfAdvanced plasma confinement in open magnetic mirrors features high relative pressure ( Beta about 60%), mean energy of hot ions of 12 keV and the electron temperature up to 0.9 keV in quasistationary regime [1]. In modern concepts simple mirror ratio of ~1520 and improved longitudinal confinement are proposed [2, 3]....
Go to contribution page -
V.I. Batkin (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1063.pdfThe GOL-NB project is a physics demonstration experiment on multiple-mirror plasma confinement that is currently under development in the Budker Institute of Nuclear Physics [1]. The final configuration of the device will include a 2.5-m-long central gasdynamic trap with two attached multiple-mirror sections of 3 m each,...
Go to contribution page -
M.G. Senstius (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1064.pdfMicrowave gyrotron beams play an important role in magnetically confined fusion plasmas due, in particular, to the electron cyclotron (EC) frequency typically being in that range. EC resonance heating (ECRH) is a popular method of heating the plasma to thermonuclear temperatures, especially for non-inductively driven...
Go to contribution page -
C. Ribeiro (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1065.pdfCompact device with an Ultra-Low Aspect Ratio Tokamak plasma (CULART) is proposed. The major objective of CULART is twofold. First, to explore very high beta (VHB) limits (~ 1) via passive stabilization under relatively low toroidal field (TF). Secondly, as a proof-of-concept, to use these VHB plasmas as a target for...
Go to contribution page -
E. Saad (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1066.pdfThe RWM instability, relevant for the advanced tokamak operation scenario, grows on the time scale of magnetic field diffusion through the conducting structures surrounding the plasma. Substantial progress has been made in the understanding and stabilization of the RWM [1]. In this work, models of resistive wall mode (RWM)...
Go to contribution page -
C. Geng (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1067.pdfMicrotearing modes are fine-scale instabilities in magnetised plasma with a sheared magnetic field, typically driven by an electron temperature gradient [1, 2]. They are characterised by large toroidal and poloidal mode numbers, and localised in the vicinity of rational flux surfaces in tokamak plasmas [3, 4]. The key role...
Go to contribution page -
R. Gatto (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1068.pdfA next major step in the research toward magnetic fusion energy production is to carry out experimental campaigns exploring regimes with relevant amount of fusion power. So far, the theoretical knowledge of the path toward a fusion burning plasma has been acquired mainly by performing numerical studies in 0 or 1-1.5...
Go to contribution page -
E.I. Soldatkina (EPS 2019)11/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1069.pdfThe presented work is part of the fundamental research on the implementation of a controlled thermonuclear reaction in open-type magnetic traps. The interest in such systems is defined by the development of powerful neutron sources, which are necessary, in particular, to control hybrid fusion-fission reactors, and, with...
Go to contribution page -
R. Dendy (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1070.pdfIntense suprathermal radiation, with spectral peaks at multiple harmonics of the deuteron cyclotron frequency, is detected from the outer midplane edge of KSTAR deuterium plasmas that are heated by tangential neutral beam injection (NBI) of 100keV deuterons. We identify how this deuterium ion cyclotron emission (ICE) is...
Go to contribution page -
M. Farnik (EPS 2019)11/07/2019, 14:00MCF
See ful abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1071.pdfCOMPASS-Upgrade (COMPASS-U) is a compact-sized, high magnetic field (up to 5 T) and high density ( 1020) tokamak under developement at IPP Prague. COMPASS-U will address the key challenges related to the plasma exhaust physics and it will contribute to provide scalings towards ITER and DEMO.
Go to contribution page
Heating of plasma in COMPASS-U... -
N. Ferron (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1072.pdfA negative ion beam source is a key component of a neutral beam injector such as that under development for ITER. Its efficient and reliable operation depends on a network of processes affecting generation, extraction and acceleration of the negative ions. Such processes interact with each other in a complex fashion....
Go to contribution page -
L. Figini (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1073.pdfIn the current ITER research plan, the path toward the full-performance DT plasma is based on a staged approach. The power available from the external Heating and Current Drive (H&CD) systems will be limited during the first phases of operation, the Electron Cyclotron (EC) system being the only one available for the first...
Go to contribution page -
A. Fukuyama (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1074.pdfFull-wave analysis including kinetic effects of plasmas has been extensively employed in studying wave heating and current drive in tokamak plasmas. Most of previous kinetic analyses of wave propagation and absorption in an inhomogeneous plasma are based the wave number.
Go to contribution page
The dielectric tensor in a hot plasma has been... -
S. Geng (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1075.pdfAn experimental negative hydrogen ion source has been developed for the preparation of a negative-ion-based neutral beam injector for HL-2M. This ion source is driven by filament-arc discharge with multi-cusp magnetic field and external filter filed. The plasma chamber has a rectangular cross section with inner dimensions...
Go to contribution page -
E.Z. Gusakov (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1076.pdfA while ago it was revealed theoretically [1,2] that in presence of a non-monotonic plasma density profile, originating due to the magnetic island or the density pump-out effect at onaxis electron cyclotron resonance heating (ECRH), the low-power-threshold absolute twoupper-hybrid (UH)-plasmon parametric decay instability...
Go to contribution page -
T. Jonsson (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1077.pdfThe ITER ICRF system is designed such that there is a 90 degree phase shift in the currents between the upper and lower rows of antenna straps. The consequences of this design has previously been studied from the point of view of the coupling, but not with respect to plasma heating. In this work the effects of poloidal...
Go to contribution page -
A. Köhn (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1078.pdfMicrowaves play an indispensable role in plasma experiments for heating and diagnostic purposes. This is especially true for fusion experiments on the path towards a burning plasma in which only little space is available for any type of internal hardware installations. Electromagnetic waves in the microwave frequency range...
Go to contribution page -
I.L. Arbina (EPS 2019)11/07/2019, 14:00MCF
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1079.pdfIon Cyclotron Resonance Frequency (ICRF) heating is one of the three auxiliary heating methods foreseen for ITER. The ICRF scenarios in ITER have been recently reassessed with emphasis on the heating and current drive performance and H-mode access capabilities [1,2] based on simple one-dimensional wave damping...
Go to contribution page -
S.I. Lashkul (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1080.pdfInvestigations of lower hybrid heating (LHH) of plasma ion component very wide and active in 70th and 80th did not result in development of a reliable heating scheme. Excitation of parametric decay instabilities accompanied by ion acceleration observed at different tokamaks at densities exceeding a certain threshold...
Go to contribution page -
B. Ljungberg (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1082.pdfWe have assessed the possibility of using the finite element method to solve the electromagnetic wave equation in a fusion plasma in 3D for ICRH applications. In particular, we have studied on-axis hydrogen heating and second harmonic deuterium heating. The purpose of this code is to develop a 3D model with more...
Go to contribution page -
T. Maekawa (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1083.pdfIn tokamak plasmas, electron Bernstein (EB) waves mode-converted from X waves at the upper hybrid resonance (UHR) layer propagate toward the higher field side and are cyclotron-damped away at Doppler shifted frequency before arriving at the electron cyclotron resonance (ECR) layer. Resulted power deposition profile...
Go to contribution page -
V.B. Minaev (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1084.pdfThe first plasma on the new spherical tokamak Globus-M2 [1] was obtained in the spring of 2018. During the test experimental campaign, the routine Globus-M shot with moderate density, current of 0.2 MA and magnetic field of 0.5 T [2] was reproduced. The main discharge parameters were monitored using routine...
Go to contribution page -
A. Nicolai (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1085.pdfThe merging-compression formation method is used in spherical tokamaks (STs) to produce high temperature plasmas without using flux from a central solenoid. Plasma rings are formed around two in-vessel poloidal field coils (MC-coils) and merged via magnetic reconnection into one plasma ring. The ring is then radially...
Go to contribution page -
G. Troshin (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1086.pdfThe development of non-inductive current drive methods is a central problem on the way of a fusion reactor development within the tokamak concept. The low-hybrid (LH) method of current maintenance can potentially be used in solving this problem, since it has one of the highest efficiencies of current drive [1]. This...
Go to contribution page -
Y. Nozawa (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1087.pdfNon-inductive formation of spherical tokamak (ST) by electron cyclotron heating and current drive (ECH/ECCD) using electron Bernstein (EB) wave is an important issue for realization of a compact and economical reactor without a central solenoid. In order to use EB waves for ECH/ECCD, EB waves have to be coupled from...
Go to contribution page -
P.B. Shchegolev (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1088.pdfThe choice of available auxiliary heating and current drive schemes is limited in spherical tokamaks (STs) due to tight aspect ratio, low toroidal magnetic field, and high plasma density approaching the Greenwald limit. The most successful heating and current drive method used to date in STs is Neutral Beam Injection...
Go to contribution page -
C. Sozzi (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1089.pdfThe JT-60SA large superconducting tokamak being built under the Broader Approach agreement jointly by Europe and Japan [1] will start operation in 2020. It is designed to address many areas of fusion science in preparation of the burning plasma era of ITER and DEMO, in particular the ones related with the control of...
Go to contribution page -
J.C. Wright (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1090.pdfIon Cyclotron Range of Frequency (ICRF) Heating is an important heating source on the Joint European Torus (JET). For the D-T campaign, various scenarios of ICRF heating are considered including second harmonic Tritium resonance and the three species hybrid resonance method [Y. Kazakov et al, Nature Physics 973 13...
Go to contribution page -
L. Calacci (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1091.pdfRunaway beam confinement and dissipation remain one of the main concern for ITER operation and a clear solution has not been found yet. ITER will be provided with a Shattered Pellet Injection (SPI) system as the primary disruption mitigation technique given the promising results provided by DIII-D [3]. To further...
Go to contribution page -
J. Chung (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1092.pdfIt has been exploring the inboard-limited ITB (Internal Transport Barrier) as an alternative advanced operation scenario for KSTAR since 2016. The experiment of ITB formation in L-mode plasma with a marginal NBI majority heating successfully demonstrated that the ITB is an alternative candidate to achieve a high...
Go to contribution page -
N.J. Fisch (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1093.pdfSince the suggestion that magnetic islands produced by tokamak tearing modes might be stabilized by non-inductive currents [1], a great number of experimental, theoretical, and computational efforts have been exerted. The stabilization effect relies upon rf waves driving current preferentially at the island center....
Go to contribution page -
M. Hron (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1094.pdfRecently, the construction of the COMPASS-U tokamak, a medium-size (R = 0.894 m; a = 0.27 m), high-magnetic-field (5 T) device, has started in the Institute of Plasma Physics of the Czech Academy of Sciences in Prague, Czech Republic. COMPASS-U will be capable to operate with plasma current up to 2 MA and, therefore,...
Go to contribution page -
Y.V. Mitrishkin (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1095.pdfThe paper deals with plasma controllability and reachability regions in the spherical tokamak Globus-M (Ioffe Inst.). Plasma magnetic control system [1] of Globus-M consists of 2 loops for plasma vertical Z and horizon R position control with thyristor current invertors [2], and 6 inner cascades for control of...
Go to contribution page -
A. Pajares (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1096.pdfIn ITER, only a limited number of actuators is available to carry out a great variety of control tasks, some of which may be closely coupled. Safe operation while attaining high plasma performance will require an integrated Plasma Control System (PCS) that has the capability of simultaneously regulating as many...
Go to contribution page -
J.A. Reusch (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1097.pdfDeveloping attractive means of initiating current without using magnetic induction from a central solenoid is a critical scientific and technical challenge facing the spherical tokamak (ST). The PEGASUS program has focused on developing the physics basis and predictive models for non-solenoidal tokamak startup using...
Go to contribution page -
N.V. Sakharov (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1098.pdfThis paper describes characteristics of plasma inductive start-up in the spherical tokamak Globus-M2. The Globus-M2 [1] is the result of Globus-M upgrade, based on the replacement of toroidal and poloidal magnetic coils in order to increase the toroidal magnetic field and the plasma current by 2-2.5 times up to B_T =...
Go to contribution page -
D. Voltolina (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1099.pdfA study of the vacuum magnetic field produced by the Poloidal Field (PF) coil system of ASDEX Upgrade is presented. In the model both coils and their powersupply feedthroughs are considered. The latter contribute to the error fields (EFs) that have already been observed and reported in [1, 2]. The effect on the B...
Go to contribution page -
A. Mariani (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1100.pdfElectron Temperature Gradient (ETG) micro-turbulence modes have been recently shown to impact the electron heat transport in tokamaks in conditions when ion-scale turbulence is close to marginality and electron heating is significant [1]. Given the relevance of these mechanisms for ITER scenarios, a new study has been...
Go to contribution page -
S. Murakami (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1101.pdfSpontaneous toroidal flows have been observed during ECH without direct momentum input in tokamak and helical plasmas[1-3]. We have studied the j × B toroidal torque due to radial diffusion of suprathermal electrons during ECH in LHD applying GNET code[4]. It is found that the j × B torque related to the suprathermal...
Go to contribution page -
H. Yamada (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1102.pdfEnergy confinement time and thermal transport has been investigated in NBI heated hydrogen (H), deuterium (D) and mixture (H&D) plasmas in a large-scale stellarator-heliotron LHD. Regression analysis of thermal energy confinement time has indicated no significant dependence on the isotope mass (A) in the expression...
Go to contribution page -
B. Patel (EPS 2019)11/07/2019, 14:00MCF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1103.pdfSpherical Tokamaks (STs) could provide a route towards a compact fusion reactor due to advantageous properties such as high plasma beta. A GW-scale ST plasma is explored where Q=10 and R=2.5m. In this design 110 MW of NBI is needed to provide 9 MA of non-inductive current, where the remaining 12 MA is pressure driven....
Go to contribution page -
D. Ho (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2001.pdfA diamond-shaped hohlraum ("Frustraum") proposed by Amendt et al. may provide adequate radiation symmetry for large capsules (1500 µm radius) while requiring < 1.8 MJ of laser energy using 3ω light and is capable of providing peak radiation temperature in the 290 300 eV range. The capsule size can be increased to...
Go to contribution page -
M. Ruijter (EPS 2019)11/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2002.pdfA Thomson source generates high energy radiation by colliding a laser pulse with an electron beam. This process can be described fully by classical electrodynamics [1]. The bandwidth of the emitted radiation depends, amongst others, by the energy spread of the electrons. When the energy spread is correlated a chirp...
Go to contribution page -
Y. Chen (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2003.pdfThe majority of solid state laser facilities built for laser fusion research irradiate targets with third harmonic light (0.35 μm) up-converted from the fundamental Nd wavelength at 1.05 μm. The motivation for this choice of wavelength is improved laser-plasma coupling. Significant disadvantages to this choice of...
Go to contribution page -
Z. Chen (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2004.pdfA high degree of spherically symmetric implosion is required for inertial confinement fusion ignition. The self-emission image of hot-spot can be used to describe the integrated compression symmetry. A KB microscopy and an x-ray framing camera (XFC) have been developed for the self-emission image measurement in Laser...
Go to contribution page -
J. Dostal11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2005.pdfMulti-frame femtosecond polaro-interferometry in combination with measurements of electron and ion emission open great opportunities for detailed studies of laser plasma properties in a wide range of applications from the inertial confinement fusion (ICF) to laboratory astrophysics. We present the...
Go to contribution page -
J.L. Milovich (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2006.pdfIn indirect drive inertial confinement fusion (ICF), a high-Z enclosure (or "hohlraum") surrounds a low-Z capsule containing DT fuel. Laser beams irradiate the interior of the hohlraum, creating an x-ray radiation bath that compresses the fuel to ignition conditions. Motion of the irradiated hohlraum wall induces...
Go to contribution page -
X. Xie (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2007.pdfSpace-resolving flux detection (SRFD) is a novel tool for the radiation field diagnostic within the hohlraum in indirect inertial confinement fusion, as it is useful to decouple the radiation fluxes from different positions experimentally[1-4]. The typical spatial coverage of the SRFD system is about 200 um, which is...
Go to contribution page -
3487. P4.2009 Interactions of crossing laser pulses in plasma with applications to auxiliary heatingB.T. Spiers (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2009.pdfIt has been suggested that crossing two electron beams within the fusion plasma may increase the energy transfer to the fuel, improving heating of the fuel and possibly pushing the hot-spot over threshold for ignition. The interaction and its dispersion relation were first derived in a theoretical study by Ratan et...
Go to contribution page -
A. Maffini (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2010.pdfLaser-driven ion acceleration is a long-standing topic of great appeal in the field of laserplasma interaction, both because of the rich physics at play and the foreseen applications [1]. Various laser-ion acceleration mechanisms have been identified in the literature. Among them, Target Normal Sheath Acceleration...
Go to contribution page -
N. Fahrenkamp (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2011.pdfThe need for higher energies in particle colliders led to the development of several types of particle accelerators, like plasma-based accelerators as a promising concept. The achievable electric fields in a plasma in the order of GV/m [1] exceed by orders of magnitude the conventional electric field generation by RF...
Go to contribution page -
K. Lotov (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2012.pdfIn plasma wakefield accelerators, intense laser or particle beams drive strong Langmuir waves with the energy density as high as the rest energy of plasma electrons. A large fraction of this energy remains in the plasma after passage of the accelerated beam and causes rapid expansion of the plasma column boundary....
Go to contribution page -
K. Jiang (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2013.pdfA scheme for controlling the divergence and direction of energetic proton beam driven by intense laser pulse is proposed. Simulations show that a precisely directed and collimated proton bunch can be produced by a sub-picosecond laser pulse interacting with a target consisting of a thin solid-density disk foil with a...
Go to contribution page -
M. Karmakar (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2014.pdfA discussion have been made to demonstrate travelling wave solution for nonlinear relativistic electron plasma wave excited by an intense proton beam. The structures of the excited wake wave electric field and the perturbed plasma electron fluid density are obtained by considering a rectangular proton beam source....
Go to contribution page -
Y. Li (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2015.pdfWe revisit the proton-boron-11 (p-B11) nuclear fusion for igniting and sustaining an idealized fusion reactor. The large radiation loss due to electron bremsstrahlung introduces a formidable challenge against harvesting net power in thermalized p-B11 plasmas. However, the recent measurement of the p-B11 cross section...
Go to contribution page -
S. Marini (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2016.pdfRecently, Pisani et al. [1] have shown the possibility of generating nearly single-cycle (less than 4 fs) propagating surface plasmons at the micro-structured surface of a grating target by a laser pulse with wavefront rotation. Since the surface plasmon can be excited when the grating is irradiated at a specific...
Go to contribution page -
O. Vais (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2017.pdfToday one of the important issues of the laser technologies is the development of the highpower laser facilities. In despite of the rapid growth of powers, which magnitudes have already broken through the PW values, the problem of achieving the extraordinary intensities and their measurement stays topical. For the...
Go to contribution page -
B.F. Svedung Wettervik (EPS 2019)11/07/2019, 14:00BPIF
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2018.pdfThe interaction between relativistically intense lasers and near-critical plasmas is a rich field of study, both for basic and applied science, e.g. providing the possibility for producing singularly intense and short XUV bursts of radiation. There are several models describing the highly complex and nonlinear...
Go to contribution page -
D.E. Tatomirescu (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2019.pdfWith the latest advances in laser science, the need to produce superior quality ion and electron beams has been a hot research field in the past decade. The hot electron density and temperature in the rear vacuum depend on the target geometrical and composition properties such as target curvature, pulse focusing...
Go to contribution page -
X. Li (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2020.pdfIn the past year, huge progresses have been made to detect radiation reaction effect in the collision of an ultraintense laser and a high-energy electron beam.
Go to contribution page
However, there still remain large uncertainties on the quantum effect of radiation reaction.
Here, we propose a scheme for identifying the quantum radiation... -
Z. Zhang (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2022.pdfWith the forthcoming laser intensities (I≥10^23 W/cm^2), synchrotron radiation in a laser-plasma interaction has attracted particular interest because it can lead to an extremely bright source of γ-rays. Here, a scheme to generate a bright γ-ray pulse with high efficiency is proposed and numerically demonstrated. Using a...
Go to contribution page -
K. Mima (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2023.pdfLaser driven neutron sources and their applications have been explored in the projects of the A-STEP program of the JST, since 2016 at ILE, Osaka University and GPI, Hamamatsu. In this paper, the status and prospects of the projects are overviewed.
Go to contribution page
In the neutron source research, the pitcher-catcher schemes with the LFEX... -
3502. P4.2024 Light-shining-through-wall searches for axion-like particles using laser-driven plasmaD.A. Burton (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2024.pdfNot all key questions in fundamental physics can be readily investigated using conventional high-energy particle collider technology. In particular, alternative methods are required to search for novel low mass particles with very weak coupling to ordinary matter. It is anticipated that the next generation of...
Go to contribution page -
D. Toporkov (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2025.pdfExperimental results related to soft X-ray (SXR) radiation generated during a head-on collision of two low-temperature plasma flows immersed in a longitudinal magnetic field are presented. The plasma flows with velocities of (2-4)x10^7 cm/s and energy contents of 70-100 kJ were produced in these experiments by a pair of...
Go to contribution page -
H. Kallala (EPS 2019)11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2026.pdfWhen an ultra-intense, femtosecond laser irradiates a solid target, an over dense plasma is generated at the target surface, acting as a non linear reflective media for the incident laser (known as a plasma mirror) that reflects the incident fields and emits a train of attosecond pulses of X-UV radiation . For ultra-high...
Go to contribution page -
L.A. Gizzi11/07/2019, 14:00BPIF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.2027.pdfA Laser driven Light Ions Acceleration Beamline (L3IA) has been established recently based on the high intensity femtosecond laser system recently upgraded and now routinely operating at >100 TW peak power at the ILIL-PW laser facility at INO. The original concept of the beamline relies on the Target Normal Sheath...
Go to contribution page -
S. Maity (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3001.pdfThe crystalline bilayers formation in dusty plasma medium depicted by the Yukawa interaction amidst dust grains has been investigated using molecular dynamics simulations [1]. Charged dust grains are made to levitate in two distinct layers forming bilayer structures in the presence of a combined gravitational and...
Go to contribution page -
A. Rokhmanenkov (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3002.pdfThis work presents a numerical simulation of the Penning discharge in 2D/3D formulation. The simulation is based on the electrostatic Particle-In-Cell (PIC) method using structured rectangular grids and implemented in the VSim [1] software package. To simulate the kinetic processes in a gas-discharge plasma, the...
Go to contribution page -
A. Fredriksen (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3003.pdfThe use of the Electron Cyclotron Resonance (ECR) for electron heating for Magnetic Nozzle (MN) thrusters have recently received increased interest, as they have been shown (Cannat et al, Phys. Plasmas, 22, 053503 (2015)) to provide improved thrust efficiency up to 16% at only 30 W input power. Such performance make such...
Go to contribution page -
T. Gyergyek (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here: :
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3004.pdfA one-dimensional kinetic model of an inverted sheath [1] is presented. The model is based on a bounded plasma system model, introduced by Schwager and Birdsall [2]. A onedimensional bounded plasma system is considered. The system is bounded by two very large planar electrodes perpendicular to the x axis. The left hand...
Go to contribution page -
A. Scurtu (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3005.pdfAny future space missions involving people on board must solve the problem of oxygen required for life support. In the case of Mars oxygen is not present in the rarefied atmosphere. We suggest a possible approach to solve the oxygen problem for Mars missions by the use of a high power coaxial plasma gun to split the...
Go to contribution page -
A. D'Angola (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3006.pdfInterest in dielectric barrier discharges (DBD) for plasma actuators has seen an important growth in the last years. A barrier discharge occurs when an alternating high voltage is applied to conductive electrodes, at least one of them covered with a dielectric layer, allowing only the passage of the displacement current....
Go to contribution page -
J. Oelmann (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3007.pdfMonitoring the fuel content in plasma-facing components is essential to get a detailed understanding of the plasma-wall interaction. Laser-induced material analysis is frequently used in fusion devices [1, 2], but there is a lack of diagnostics which can provide depth resolved and quantitative information when no...
Go to contribution page -
C. Piferi (EPS 2019)11/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3008.pdfThe aim of this project is to study the current-voltage properties in a Surface Dielectric Barrier Discharge (SDBD) plasma. Our plasma device is made by a 3 mm thickness dielectric barrier in Teflon and two 12 cm long conductive electrodes applied on the opposite side with 2 cm overlapping. One of the electrode is...
Go to contribution page -
H. Kawazoe (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3009.pdfThermochemical and radiative transfer processes in a shock layer should be clarified to develop a future space vehicle because of their affecting the aerodynamic forces and heating rates. Although the two-temperature model has been utilized widely for a long time, the accuracy of the reaction rate coefficients might be...
Go to contribution page -
E.A. Shershunova (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3010.pdfAtmospheric pressure plasma jets (APPJs) today serve as a tool for treating various surfaces from metals to polymers and biological tissues sensitive to temperature [1]. Adhesion, hydrophilic and bacteriostatic properties of the surface can be changed under plasma treatment. The latest studies showed that not only the...
Go to contribution page -
D. Rauner (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3011.pdfInductively coupled plasmas (ICPs) are a widespread and versatile radio frequency (RF) driven plasma generation technique. Thus, significant efforts have been made to optimize them according to the individual requirements at hand. The analysis of the RF power transfer efficiency - or analogously of the plasma equivalent...
Go to contribution page -
C. Arnas (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3012.pdfThe properties of nanoparticles (NPs) depend on their shape, size, chemical composition, inner structure (atom arrangement) as well as their adhesion forces, the later determining the final state of collected aggregates. It is shown here that there are differences of structure and chemical composition of NPs which are...
Go to contribution page -
R. Friedl (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3013.pdfThe resonant transition A^2Σ → X^2Π of the hydroxyl molecule OH is studied in detail in the wavelength range 280-330 nm. Emission from an atmospheric glow discharge, an RF micro jet plasma, a microwave torch as well as a plasmoid are considered. The parent molecule to the OH molecule is water vapor for each of the plasma...
Go to contribution page -
M. Hénault (EPS 2019)11/07/2019, 14:00LTPD
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3014.pdfThis contribution describes an interesting phenomenon concerning the interaction between a non-equilibrium low-pressure radiofrequency plasma and aggregated particles injected into it. This phenomenon is related to the particle de-agglomeration when they are injected in a plasma. In order to develop nanoparticle...
Go to contribution page -
I. Uzun-Kaymak (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3014.pdfMETU Plasma Research Laboratory microwave plasma torch is a high power (up to 2kW) microwave source operating at 2.45 GHz via a surfaguide waveguide. Argon gas is fed from one end, the plasma column generated inside a 20 mm diameter quartz tube comes out as a high-speed continuous jet from the other end. Due to its...
Go to contribution page -
A. Laricchiuta (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3015.pdfLarge attention is nowadays devoted to the understanding of the activation of CO_2 by cold plasmas in different conditions (MW, DBD, nano-pulsed discharges). Theoretical efforts are being developed to better understand the electrical conditions necessary for maximizing the CO_2 dissociation process [1-2]. In particular,...
Go to contribution page -
K. Hassouni (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3016.pdfMW assisted hydrogen methane plasmas have been extensively used for growth of CVD diamond and graphene. In this article, we discuss the results of self-consistent simulation of hydrogen-methane plasmas in a microwave resonating cavity over wide range of operating conditions (25-200mbar) and different concentrations of...
Go to contribution page -
V. Borzosekov (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3017.pdfIt is essential to know discharge propagation velocity dependences on various operational parameters as for understanding of discharge development physics as for applications. This applies as well for self-non-self-sustained (SNSS) discharges [1] in subthreshold microwave fields. For microwaves at wavelength λ = 2 cm it...
Go to contribution page -
C.T. Teodorescu-Soare (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3018.pdfSpectral investigations were carried out on a cathode system, consisting of two concentric spherical hollow grids with aligned orifices to diagnose Complex Space Charge Structures (CSCS) bordered by an electric double layer. CSCS in form of a single or multiple quasi-spherical luminous plasma bodies are called fireballs,...
Go to contribution page -
H. Nakamura (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3019.pdfHollow cathode discharge is able to generate a high density plasma inside the hollow cathode cavity [1]. To develop a small sized electron beam source with a high current and high durability, the hollow cathode discharge is applied to an electron source for the high current electron beam in this research. The schematic...
Go to contribution page -
S. Pramanik (EPS 2019)11/07/2019, 14:00LTPD
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3020.pdfAn analytical study on the space-time evolution of normal electrostatic modes in warm multicomponent plasma is presented. Multi-component plasma can be comprised of electrons, ions, dusts etc. Immobile dust grains can be either positively or negatively charged. [1] In this work, they are considered to be distributed...
Go to contribution page -
C. Carra11/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3021.pdfPlasma polymerization of organosilanes is a valuable method for depositing both inorganicSiO2-like films, which have found many applications in microelectronics and optics, and polymer-like SiOxfilms, suitable for barrier films in food packaging and corrosion protection layers.In this work, SiOx-like films were...
Go to contribution page -
Y. Abe11/07/2019, 14:00
See the full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3022.pdfZirconia shows excellent dental applications such as crowns and bridges. When adhering a zirconia crown to a tooth, the abutment tooth needs to be prepared a large amount and thus the bonding area on the abutment tooth becomes small. For this reason, bond strength is important factor for keeping the ...
Go to contribution page -
R. Pakter (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4001.pdfThe dynamics of a pure electron plasma confined by strong magnetic fields in a Malmberg-Penning trap is analogous to the vortex flow in an inviscid two-dimensional fluid. In fact, in the guiding-center approximation the transverse electron evolution is dictated by the drift-Poisson equations which are isomorphic to the...
Go to contribution page -
I. Abramov (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4004.pdfThe formation of the ambipolar potential profile in a plasma flow expanding from a mirror magnetic trap is a challenging problem in plasma physics [1-6]. Here we focus on a particular case of non-equilibrium plasma with hot electrons expanding from a gas dynamic trap that is important for a number of applications [7-10]....
Go to contribution page -
V.V. Mykhaylenko (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4005.pdfThe skin effect is the basic mechanism which governs the distribution of the electromagnetic field as well as of electron heating and power absorption in the ICP plasma. Recent interest in ICPs operating at low gas pressure (0.1-50 mTorr) has prompted intensive studies of the anomalous skin effect - mechanisms of the...
Go to contribution page -
N. Plihon (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4006.pdfThe control of plasma potential profile in plasmas is crucial for various applications ranging from space propulsion [1], the development of plasma centrifuges [2] or the mitigation of turbulent transport by sheared flows [3].
Go to contribution page
We report here a detailed experimental investigation of the plasma potential control using... -
C.B. Smiet (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4007.pdfMagnetic nulls in 3 dimensional fields appear in the solar corona, in planetary fields and in fusion concepts such as the polywell and Field Reversed Configuration (FRC). These points where the field vanishes are topologically stable and are hotspots for magnetic reconnection. We analyze these nulls, their motion and...
Go to contribution page -
C. Ryu (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4008.pdfRandom motions of particles have an interesting property to break the magnetic field lines, and can induce a net transport flow crossing the field lines. The transport flow deserves special attention from the dynamo-theoretical point of view. By definition, the cross field diffusion velocity describes a relative one to...
Go to contribution page -
N. Shukla (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4009.pdfThe Biermann battery [1], driven by the perpendicular temperature and pressure gradients, is often dominant source of magnetic fields generated in laser-plasma experiments. A detailed study of Biermann generated magnetic fields in collisionless systems has been carried out [2] in an expanding plasma bubble, showing that...
Go to contribution page -
R. Mukherjee (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4010.pdfWithin the framework of MagnetoHydroDynamics, a strong interplay exists between flow and magnetic fields. This interplay is known to lead to several interesting phenomena such as nonlinear non-dispersive Alfven waves, recurrence phenomena and magnetic re-connection, to name a few. Using a set of divergence free...
Go to contribution page -
A. Theodorsen (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4011.pdfSelf-organized criticality (SOC) is a well-known paradigm for explaining power law probability distributions and frequency spectra in astrophysical, space and laboratory plasmas [1, 2]. By contrast, in the scrape-off layer of magnetically confined fusion plasmas and other turbulent systems, probability distributions with...
Go to contribution page -
H. Yan (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4012.pdfWe have detected the first observational evidence of magnetosonic modes in the Cygnus X region, with our novel method, the signature from polarization analysis (SPA). The region dominated by the magnetosonic modes overlap to a high degree with the enhanced gamma ray emission, completely in line with the predictions from...
Go to contribution page -
N. Morshedian (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4013.pdfA system of the modified quantum fluid equations has been used for the investigation of Alfven wave dispersion properties in a non-ideal astrophysical plasma medium. The dispersion relation is derived by perturbation method in the presence of dissipative effects, self-gravitational, quantum potentials and electromagnetic...
Go to contribution page -
F. Cruz (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4014.pdfWhen subject to the rotationally induced electric field of pulsar polar caps, electrons and positrons are accelerated along the magnetic field, producing gamma-ray curvature radiation. The emitted gamma-rays, in turn, are absorbed by the magnetic field, converting to new electron-positron pairs. The repetition of this...
Go to contribution page -
M.T. Whyte (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4015.pdfWe present modelling a dynamical spectrum of a host star's cyclotron emission which came through a magnetically active (auroral) region of a planetary magnetosphere. The model for the local planetary emission is based on a horseshoe-type cyclotron instability [1,2]. A full electromagnetic modelling of a signal which...
Go to contribution page -
A.A. Nechaev (EPS 2019)11/07/2019, 14:00BSAP
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4016.pdfWe suggest and investigate in detail an analytical model of a quasi-stationary current sheet in a collisionless plasma describing the boundary of a magnetosheath formed by the solar (stellar) wind [1]. The model significantly expands the scope of the magnetohydrodynamic approach and is based on a consistent kinetic...
Go to contribution page -
D. Burgess11/07/2019, 14:00BSAP
See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.4017.pdfWe present numerical results from high-resolution hybrid kinetic and full PIC kinetic simulations of plasma turbulence, following the development of the energy cascade from large magnetohydrodynamic scales down to electron characteristic scales. By considering the low plasma beta regime we use our results for interpreting...
Go to contribution page -
S. Wiesen (EPS 2019)11/07/2019, 16:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.103.pdf
Power exhaust in future electricity producing fusion device like DEMO features difficulties which, compared to ITER, are harder to tackle in terms of operational control requiring an improved physics understanding. For a given power loss density Ploss/R the plasma facing components need to withstand a maximum heat flux...
Go to contribution page -
G. Papp (EPS 2019)11/07/2019, 16:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.105.pdf
Developing a disruption & runaway electron (RE) mitigation strategy that robustly scales to ITER and beyond is a major challenge. The dynamics is governed by a complex interplay of effects such as the atomic physics and penetration of the high-Z material injected for mitigation, quench dynamics (MHD), kinetic physics,...
Go to contribution page -
A. Huebl (EPS 2019)11/07/2019, 16:30BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.203.pdf
Since the very beginning, simulations have been an integral part of laser plasma research. With the advance of high-power lasers, non-linear effects on ultra-short time scales require extensive control in experimental setups, theoretical assumptions and simulation stability alike. For the latter, Particle-in-Cell...
Go to contribution page -
B. Cerutti (EPS 2019)11/07/2019, 16:30BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.403.pdf
Rapidly rotating neutrons stars and black holes are the central engines of some of the most extreme astrophysical phenomena such as gamma-ray bursts, pulsars, X-ray binaries, binary mergers or active galactic nuclei. The activity of these compact objects is often associated with the creation and the launching of a...
Go to contribution page -
J. Harrison (EPS 2019)11/07/2019, 17:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.104.pdf
The operation of future high-power density fusion reactors such as ITER and DEMO requires avoiding damaging plasma-facing surfaces and good core confinement. The former requirement necessitates operating in the detached divertor regime, and the latter is met by operating in the high confinement (H-) mode. Recent...
Go to contribution page -
D. Shiraki (EPS 2019)11/07/2019, 17:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.106.pdf
Recent advances in shattered pellet injection (SPI) in the DIII-D tokamak have led to improved understanding of several critical issues for the ITER Disruption Mitigation System. Infrared thermography shows elevated thermal quench heat loads indicative of radiation asymmetries peaked near the injection source. However...
Go to contribution page -
A. Arefiev (EPS 2019)11/07/2019, 17:00BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.204.pdf
Newly constructed laser facilities such as ELI NP and ELI Beamlines are expected to deliver unprecedented laser intensities, making it possible to probe new regimes of light-matter interactions in laboratory conditions. One such regime is where a laser-irradiated solid material becomes relativistically transparent and...
Go to contribution page -
G. Morlino (EPS 2019)11/07/2019, 17:00BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I4.404.pdf
Understanding the transport of charged particles in the Galaxy is fundamental to solve the mystery of the origin of Galactic cosmic rays (CR) and to asses their role in several Galactic processes. Recent results from direct experiments, especially AMS-02 and PAMELA, are revealing a fine structure in the CR spectrum...
Go to contribution page -
A. Leonard (EPS 2019)11/07/2019, 17:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.105.pdf
A comprehensive diagnostic set compared against 2D modeling has provided new insight into energy transport and dissipation processes in detached plasmas and their scaling to future devices. Experiments and modeling reveal a detached divertor plasma dominated by plasma convection from the X-point towards the target....
Go to contribution page -
L. Piron (EPS 2019)11/07/2019, 17:30MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.109.pdf
The presence of Error Fields (EFs) in magnetic fusion devices can affect energy confinement and plasma stability by braking plasma rotation, by inducing fast particle losses and being amplified when exploring high- regimes. The resulting EF Locked Modes (LMs) can be stabilized by NBI injection through the rotation...
Go to contribution page -
L. Esnault (EPS 2019)11/07/2019, 17:30BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.206.pdf
Despite being one of the most basic process of quantum electrodynamics (QED), and being responsible of the universe opacity to high energy photons [1], the electron-positron pair production by two photons collision (gamma-gamma -> e-e+, linear Breit-Wheeler [2] process, LBW) has never been observed directly in the...
Go to contribution page -
H. Goedbloed (EPS 2019)11/07/2019, 17:30BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.401.pdf
The recently developed theory of the Spectral Web [1, 2] is a method to compute the full complex spectrum of stationary plasmas together with a connecting structure. This permits to consider the enormous diversity of MHD waves and instabilities of rotating tokamaks and astrophysical plasmas from a single unifying view...
Go to contribution page -
T.H. Eich (EPS 2019)11/07/2019, 17:45MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.106.pdf
Operation of tokamaks with H-Mode characteristics and at high densities is generally foreseen for future high-power fusion systems, including ITER. The ease of access to divertor detachment via impurity seeding scales to first order proportional to (n_sep/n_GW)^2 lambda_q/rho_s,pol [1] with lambda_q being the power...
Go to contribution page -
F. Villone (EPS 2019)11/07/2019, 17:45MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.110.pdf
Disruptions are one of the fundamental issues to be tackled in future tokamaks [1], due to significant eddy and halo currents in the conducting structures producing substantial electromagnetic forces and torques thanks to the interaction with the magnetic field. It is hence fundamental to have reliable modelling tools...
Go to contribution page -
R. Capdessus (EPS 2019)11/07/2019, 17:45BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.207.pdf
When an ultra-intense laser pulse interacts with plasma, the accelerated electrons experience the back-radiation reaction due to the emission of electromagnetic radiation, and this has recently been experimentally evidenced [1]. The results suggest that both the quantum and classical nature of the back-radiation...
Go to contribution page -
A. van Marle (EPS 2019)11/07/2019, 17:45BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.402.pdf
Cosmic rays are charged particles, moving at relativistic speeds after being accelerated through interaction with astrophysical shocks. This process, known as diffusive shock accleration, or Fermi acceleration, involves the particle repeatedly crossing the shock, picking up speed each time it is reflecte by the local...
Go to contribution page -
X. Gong (EPS 2019)11/07/2019, 18:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.107.pdf
A 100 sec long-pulse steady-state H-mode plasma with good energy confinement (H98(y,2) ~ 1.1) has been successfully achieved on EAST using RF heating and current drive. Recent EAST experiments with improved hardware capabilities have demonstrated steady-state fully non-inductive scenarios with extension of fusion...
Go to contribution page -
F.J. Artola (EPS 2019)11/07/2019, 18:00MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.111.pdf
The growing need for a fundamental understanding of complex MHD phenomena in diverted tokamaks requires the development of more sophisticated and highly demanding codes. The numerical MHD code JOREK-STARWALL is adapted and applied to the simulation of free-boundary instabilities. The investigation of this type of...
Go to contribution page -
T. Silva (EPS 2019)11/07/2019, 18:00BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.208.pdf
The interaction of intense electromagnetic waves with plasmas is a rich research topic. Magnetic fields play a crucial role in this context and there are several processes that can lead to the generation and amplification of these fields. Recent experiments, for instance, demonstrated the generation large-scale magnetic...
Go to contribution page -
K. Makwana (EPS 2019)11/07/2019, 18:00BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.403.pdf
The properties of magnetohydrodynamic (MHD) turbulence have significant implications for astrophysical phenomena like cosmic ray scattering. We study properties of MHD modes by decomposing data of MHD simulations into linear MHD eigenmodes - namely the Alfvén, slow, and fast modes. Some earlier studies have shown the...
Go to contribution page -
M. Faitsch (EPS 2019)11/07/2019, 18:15MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.108.pdf
In recent years the focus of tokamak fusion research onto power exhaust increased showing that first wall power load is one of the major challenges in realizing a power plant. Unmitigated divertor power loads in next step fusion devices like ITER are projected to exceed material limits making significant impurity...
Go to contribution page -
Y. Park (EPS 2019)11/07/2019, 18:15MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.112.pdf
Long-pulse plasma operation at high normalized beta up to 4 (exceeding the n = 1 ideal MHD no-wall stability limit) in KSTAR is presently limited by tearing instabilities rather than resistive wall modes that are computed to be stabilized by kinetic MHD effects. H-mode plasma operation during the 2018 KSTAR device...
Go to contribution page -
C. Xiao (EPS 2019)11/07/2019, 18:15BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.209.pdf
Parametric instabilities in two- and three-dimensional configurations in inhomogeneous plasmas have been studied on a wide range of parameter space ranging from direct-drive scheme to shock ignition. These include the nonlinear evolutions of stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS), and...
Go to contribution page -
C.C. Chaston (EPS 2019)11/07/2019, 18:15BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O4.404.pdf
Observations recorded from NASA's Van Allen Probes have revealed the prevalence of a broad spectrum of Alfvénic field fluctuations in the inner magnetosphere. The properties of these waves in the inhomogeneous plasma of his region of near-Earth space give rise to a number of resonant and non-resonant interactions...
Go to contribution page -
C. Riccardi (EPS 2019)12/07/2019, 09:00LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.012.pdf
Nanostructured materials are revolutionizing many fields of science and technology and are finding their way in many commercial products. Their interest is due to the fact that nanostructured films present functional (tribological, biological, electrical, optical) properties which are new, or of superior quality,...
Go to contribution page -
A. Loarte (EPS 2019)12/07/2019, 09:35MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.013.pdf
The primary aim of the ITER Research Plan (IRP) is to define the plan of research and development and of the exploitation of the facility necessary to meet the ITER mission goals. The IRP is divided into two main phases after first plasma demonstration: operation in H/He plasmas (Pre-Fusion Plasma Operation (PFPO)) and...
Go to contribution page -
J. Huang (EPS 2019)12/07/2019, 10:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.101.pdf
Significant progress has been achieved along the China's roadmap towards tokamak based fusion energy production. The three-pronged approach towards the Chinese Fusion Engineering Test Reactor (CFETR) will be reported.
Go to contribution page
Recently, EAST achieved the first demonstration of 100s time scale steady-state H-mode operation with... -
P. Tomassini (EPS 2019)12/07/2019, 10:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.201.pdf
The production of high-quality electron bunches in Laser Wake Field Acceleration [1] relies on the possibility to inject ultra-low emittance bunches in the plasma wave. A new bunch injection scheme (Resonant Multi-Pulse Ionization, ReMPI) has been conceived and studied in which electrons extracted by ionization are...
Go to contribution page -
E. Martines (EPS 2019)12/07/2019, 10:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.301.pdf
This contribution reviews recent activity of the Padova group on the use of helium plasmas in plasma medicine. Following the initial emphasis on disinfection of the cornea [1], the research activity has developed along several research lines, which cover the topics of wound healing, cancer treatment and non-thermal...
Go to contribution page -
L.H. Kadowaki (EPS 2019)12/07/2019, 10:40
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.401.pdf
Turbulent fast magnetic reconnection can be an important mechanism for accelerating particles to relativistic velocities and produce very-high-energy (gamma-ray and neutrino) emission in the magnetized regions of galactic and extragalactic black hole sources. In this talk, we discuss this process in the framework of...
Go to contribution page -
S.A. Henneberg (EPS 2019)12/07/2019, 11:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.102.pdf
Lausanne, Switzerland An extensive study of quasi-axisymmetric equilibria has been conducted, from which a highly promising magnetic field design has been found by exploiting ROSE (Rose Optimizes Stellarator Equilibria) [1] - an optimization code for 3D magnetic plasma equilibria. The results of this design study and...
Go to contribution page -
A.E. Hussein (EPS 2019)12/07/2019, 11:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.202.pdf
Modern laser technology and the realization of high-intensity, short-pulse laser systems using Chirped-Pulse Amplification has led to the development of novel laser-based acceleration schemes. For high-intensity, picosecond duration pulses, where the pulse duration exceeds the plasma period, the laser pulse will expel...
Go to contribution page -
E. Thomas (EPS 2019)12/07/2019, 11:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.302.pdf
For over a decade, it has been postulated that the addition of a magnetic field can have a profound influence on the properties of a complex/dusty plasma. The Magnetized Dusty Plasma Experiment (MDPX) device at Auburn University is the most recent facility to study dusty plasmas in strongly magnetized plasmas. The MDPX...
Go to contribution page -
R.A. Bamford (EPS 2019)12/07/2019, 11:10BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.401.pdf
In 2023 the first element of a new international space station is to be launched. The Lunar Orbital Platform-Gateway (LOP-G), or Deep Space Gateway (DSG) will orbit the Moon rather than the Earth [1]. The purpose of the Gateway is to acclimatise crew and technology for long durations and radiation exposure of deep-space...
Go to contribution page -
M. Shalaby (EPS 2019)12/07/2019, 11:25BSAP
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.402.pdf
Astrophysical plasmas are ubiquitous and differ from laboratory plasmas in key aspects. They are typically cold (k_B T<<m_e c^2), collisionless, and usually contain relativistic sub-populations. To study the evolution of such plasmas, it is necessary to employ a fully kinetic treatment.
Go to contribution page
Particle-in-cell (PIC) algorithms... -
S. Zoletnik (EPS 2019)12/07/2019, 11:40Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.J601.pdf
Filaments detaching from the edge of tokamak plasmas are well known. They are generated by pressure driven instability and driven outward by polarization due to the magnetic field curvature and gradient. Similar structures are also commonly observed in the edge and island divertor of the Wendelstein 7-X stellarator....
Go to contribution page -
C. Bourdelle (EPS 2019)12/07/2019, 11:40MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.101.pdf
WEST is a full tungsten (W) superconducting tokamak with a major radius of 2.5 m, an aspect ratio of 5 and a nominal magnetic field of 3.7T. WEST programme aims at power exhaust studies on the ITER-like actively cooled tungsten divertor and at bulk plasma performance in discharges reaching 1000s.
Go to contribution page
So far up to 5.3 MW of... -
C. Benedetti (EPS 2019)12/07/2019, 11:40BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.201.pdf
We present modeling and experimental results concerning the guiding of relativistically intense laser pulses with peak power of 0.85 PW over a distance of 15 diffraction lengths. Laser guiding was achieved by increasing the focusing strength of a capillary discharge waveguide using laser inverse Bremsstrahlung heating....
Go to contribution page -
S. Poniaev (EPS 2019)12/07/2019, 11:40LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.301.pdf
The electromagnetic rail accelerators (railguns) with plasma armature are an interesting object for the plasma physics. The acceleration of the plasma (or a solid body ahead of plasma armature) in railguns are due to electromagnetic interaction of the electrical current in plasma and magnetic field (generated by current...
Go to contribution page -
M. Mantsinen (EPS 2019)12/07/2019, 11:55MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.102.pdf
Ion Cyclotron Resonance Frequency (ICRF) heating is one of the auxiliary heating methods which will be used in ITER. A detailed assessment of ICRF schemes available in the non-active phase of ITER operation was recently carried out [1]. As a result, the ICRF scenarios considered for ITER also include the so-called...
Go to contribution page -
E. Siminos (EPS 2019)12/07/2019, 11:55BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.202.pdf
Intense, ultra-short electromagnetic pulses are enabling applications such as the control of motion in solids and the observation of reaction dynamics at the electronic level. While both high-intensity and carrier envelope phase (CEP) tunability are crucial, they are hard to obtain with current methods. Laser-plasma...
Go to contribution page -
A. Sidorov (EPS 2019)12/07/2019, 11:55LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.302.pdf
At present, the THz frequency range is still the least studied from the point of view of gas discharge physics. The study of the discharge, sustained by the powerful focused beams of THz radiation, has become possible recently due to the development of powerful sources in this range (FELs and gyrotrons) and is of...
Go to contribution page -
A. Biancalani (EPS 2019)12/07/2019, 12:10Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.J602.pdf
Tokamak plasmas are examples of complex systems where multiple spatial and temporal scales are intrinsically linked. Microturbulence, meso-scale zonal structures (ZS, like zerofrequency zonal flows and geodesic acoustic modes) and macroscopic MHD instabilities like Alfvénic modes (AM), mutually interact either due to...
Go to contribution page -
D. Ricci (EPS 2019)12/07/2019, 12:10MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.103.pdf
For an efficient and robust use of Electron Cyclotron (EC) to assist the start-up phase of the plasma in large tokamaks with superconductive coils, it is necessary to develop appropriate models capable of predicting from present experiments to future scenarios (as for ITER, JT60SA and DEMO). Experience gained on TCV and...
Go to contribution page -
A. Savel'ev (EPS 2019)12/07/2019, 12:10BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.203.pdf
We demonstrated efficient electron acceleration in the plasma channel with injection through the breaking of plasma waves generated by parametric instabilities. It was shown experimentally that in the case of optimal preplasma parameters femtosecond laser pulse with an intensity of 5x10^18 W/cm^2 and an energy of 50 mJ...
Go to contribution page -
C. Ionita-Schrittwieser (EPS 2019)12/07/2019, 12:10LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.303.pdf
Multiple complex space-charge structures in unmagnetized low temperature plasmas, such as fireballs or inverted fireballs, arise from ionization phenomena near electrodes or due to local constraints [1,2]. The generation of such complex space-charge structures is often accompanied by plasma instabilities. [3,4]....
Go to contribution page -
M. Maslov (EPS 2019)12/07/2019, 12:25MCF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.104.pdf
Series of isotope control experiments in H/D mixtures on JET [1] have shown that NBI fuelling species has only a weak effect on the core isotope composition, which remains determined by the edge H/D ratio and therefore by the injected gas. The analysis of the core particle transport of the ion components revealed a fast...
Go to contribution page -
H. Peng (EPS 2019)12/07/2019, 12:25BPIF
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.204.pdf
The plasma devices can stand for much larger energy fluency than solid optical devices. Thus plasma devices become a hot topic recently, as the laser power is promoted to Petawatt order. Plasma grating is one of these appealing plasma devices. Plasma grating can act as laser polarizer and waveplate for both long,...
Go to contribution page -
Q. Yi (EPS 2019)12/07/2019, 12:25LTPD
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/O5.304.pdf
Z-pinch dynamic hohlraum (ZPDH) is one of the promising approaches to generate high energy density X-ray to be applicated in inertial confinement fusion, radiation physics and opacity measurements. The quality of the hohlraum radiation field can be characterized by radiation temperature. Brightness temperature provides...
Go to contribution page -
D. Maurer (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1001.pdfThe Compact Toroidal Hybrid (CTH) is an l=2, m=5 torsatron/tokamak hybrid (R=0.75m, a~0.2m, and |B|<=0.5T) with the ability to vary the confining magnetic field configuration and generate rotational transform profiles that are tokamak-like with ohmically driven plasma current for disruption and MHD studies. The main goals...
Go to contribution page -
L. Pigatto (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1002.pdfThe forthcoming device JT-60SA, under construction in Naka (Japan), is particularly well equipped for studying Advanced Tokamak scenarios with high N and a non-negligible fraction of energetic particles from neutral bean injectors [1][2]. These plasmas are prone to exhibit kink-like ideal MHD instabilities; one or more...
Go to contribution page -
N. Isernia (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1003.pdfDisruptions are one of the major concerns in ITER and other future tokamaks [1]. In addition to heat, particle flux, and energetic electrons impacting the first wall, significant electromagnetic loads will arise, due to the interaction of eddy and halo currents in the conducting structures with the magnetic field....
Go to contribution page -
S. Wang (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1004.pdfActive control of the n = 1 (n is the toroidal mode number) resistive wall mode (RWM) is numerically studied, taking into account (i) recent design of the plasma equilibrium for the ITER 9 MA steady state scenario, and (ii) two important control aspects towards realistic modeling of the RWM feedback for ITER, namely the...
Go to contribution page -
T. Xu (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1005.pdfIn this work, we have constructed an ITER con guration, which is generated by currents owing within the plasma and currents owing in external coils. The plasma current density takes the form j_φ (r; z) = - ar - bR^2/r or other H-mode current pro le inside the plasma, and is zero in the surrounding vacuum. We use Green's...
Go to contribution page -
M. Dibon (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1006.pdfDisruption mitigation is one of the main research topics on the way to ITER and future Tokamak fusion power plants. Therefore, extensive studies have to be carried out on large Tokamaks to understand the physics and to develop the necessary technologies. JT-60SA, which will go into operation in 2020, will be a primary...
Go to contribution page -
C. Chen (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1007.pdfA new compact torus injection (KTX-CTI) system is being developed on Keda Torus eXperiment (KTX), which is a newly built medium size reversed field pinch device. The KTXCTI is a three-meter long linear device designed to inject compact torus (CT) into KTX at a high speed of over 100km/s. The tangential injection angle is...
Go to contribution page -
M. Vallar (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1008.pdfJT-60SA is large device (R_0/a=3.0/1.1) which will use neutral beam (NB) injection as the main actuator to reach the desired plasma temperature and performance[1]. In total, the NBI system provides 34MW of power, of which 10 (24) MW is injected at the energy of 500 (85) keV. The geometry features both parallel and...
Go to contribution page -
J.P. Graves (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1009.pdf
Analytic derivation and numerical calculation of pressure driven MHD instabilities in toroidal plasmas is notoriously difficult. Instability is determined by apparently weak effects in the toroidal metric tensor. A classical example is the m = n = 1 internal kink mode, where previous numerical and analytic results...
Go to contribution page -
V. Lukash (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1010.pdfAn increase of the poloidal flux expansion near the divertor target plates reduces the heat flux on the plates. A study has been performed with the goal to design and simulate with the DINA code [1] an ITER 15 MA DT scenario (Q = 10, Pfus = 500 MW) with a plasma configuration during the burn having a maximum expansion of...
Go to contribution page -
J. Morales (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1011.pdfPredicting plasma performance is an essential activity for assessing future campaigns in present day tokamaks as well as in future devices as ITER or JT-60SA. In particular, predictions for the ramp-up phase are of special importance, as successful plasmas in the flat-top phase critically depend on the initial...
Go to contribution page -
A.R. Polevoi (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1012.pdfThe parametric Operational Space (OS) for Steady-State (SS) operation [1] in ITER has been reassessed by global analysis taking into account the baseline design of the Neutral Beam Injection (NBI) and EC H&CD systems and their foreseen upgrades (up to P_NBI = 49.5 MW and with P_EC = 30 MW, where up to 40 MW upgrade is...
Go to contribution page -
O. Beeke (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1013.pdfPlasma shaping is known to affect the properties of micro instabilities that cause outwards radial transport of heat and particles in tokamaks. In particular, the elongation has been observed to have a stabilizing effect on the ion-temperature-gradient (ITG) instability in low-β plasmas, whilst increased triangularity...
Go to contribution page -
N. Carlevaro (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1014.pdfWith the aim of finding and validating reduced models able to reproduce the relevant features of the energetic particle interacting with the Alfvénic spectrum, we define a mapping procedure (based on the resonance rule) between the reduced radial profile of the burning plasma scenario and the velocity space of the...
Go to contribution page -
K. Kamiya (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1015.pdfIn this study, we analyzed the structure generation of the edge radial current (j_r) by means of Poisson's equation with a measured E_r data (CXRS diagnostic) in JT-60U NBI heating plasmas [1-4]. About 200 ms after the start of NBI heating, a slow L-H transition takes place, which evolves into a fully-developed H-mode...
Go to contribution page -
A. Bergmann (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1016.pdfThe neoclassical impurity transport in the pedestal region of a tokamak plasma is studied with non-local guiding center particle simulations, employing the code HAGIS with a Monte Carlo collisions model. The simulations are done in two steps, assuming the trace limit for the impurity ions. First the parallel velocity of...
Go to contribution page -
R. Bielajew (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1017.pdfI-mode is a naturally ELM-free improved confinement regime which exhibits high energy confinement and a temperature pedestal, but low particle confinement and a density profile similar to L-mode [1]. The weakly coherent mode (WCM) occurs in the pedestal region of Imode plasmas at both ASDEX Upgrade (AUG) and Alcator...
Go to contribution page -
J. Cheng (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1018.pdfIn the transition from low (L) to high (H) confinement regime a transport barrier usually develops in a narrow layer and so called pedestal of high temperature and density gradients forms at tokamak plasma edge [1]. The accumulation of energy and particles inside the pedestal normally leads to an explosive relaxation of...
Go to contribution page -
A.R. Field (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1019.pdfSustained ELMy H-mode operation at high heating power (~ 32 MW) in JET-ILW requires gas puffing to control radiation from high-Z impurities (W, Ni) by increasing their rate of removal by ELMs, as well as core ICRH heating to mitigate their accumulation and sweeping of the strike points to avoid overheating of the target...
Go to contribution page -
F. Jaulmes (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1020.pdfEdge transport barrier (ETB or pedestal) regime is often associated with transient relaxations (Edge Localized Modes or ELMs) of the plasma. These periodic bursts of particles and energy can significantly erode and damage the materials (eg. Tungsten, W) of the tokamak vessel. Any high-Z impurities remaining confined in...
Go to contribution page -
M. Sos (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1021.pdfElectron density and temperature profile measurements are important for magnetic confinement fusion research performed on tokamaks. One of the research areas these measurements help to understand is physics of edge transport barrier (pedestal) formation, which is closely related to plasma performance in the H-mode regime....
Go to contribution page -
B. Vanovac (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1022.pdfThe High confinement mode (H-mode) edge pedestal, a narrow region (~1.5 cm width) with steep pressure gradient just inside the last closed flux surface, is prone to various instabilities. Instabilities include intermittently occurring Edge Localised Modes (ELMs) but also other more continuous modes that occur in between...
Go to contribution page -
B.S. Victor (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1023.pdfRecent results on DIII-D show that low-field-side RMPs improve the robustness of discharges to high-Z impurity injection. Experiments were performed in H-mode ITER-baseline-shape discharges for three cases: 1. ELMy - q95 = 4.1, 2. RMP ELM-suppressed - q95 = 4.1, and 3. RMP with ELMs - q95 = 3.5. For each case above,...
Go to contribution page -
M. De Angeli (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1025.pdfDust in tokamaks is unlike to be mobilized prior to the beginning of plasma discharges, then dust presence in the vessel during the start-up phase of discharges is not considered an issue. Problems could arise due to the presence of magnetic dust [1,2,3] that are more likely to fly in the vessel volume during stat-up...
Go to contribution page -
E. Gilson (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1026.pdfLong periods of ELM quiescence <= 5sec were observed with BN injection into KSTAR ELMy H-modes with an innovative Impurity Powder Dropper (IPD) [1]. In addition, divertor D_α emission was substantially reduced with boron B injection into ELMy H-modes, indicating improved recycling control. In both cases, there was no...
Go to contribution page -
W. Gracias (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1027.pdfEdge simulations until recently focussed on simulating only the scrape-off layer (SOL) and including appropriate boundary conditions to the numerical domain to mimic effects like the presence of a separatrix on the inner radial boundary. To a large extent, flux-driven 3D simulations have had considerable success in...
Go to contribution page -
J. Wu (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1028.pdfA beam emission spectroscopy (BES) diagnostic system has been developed on HL-2A tokomak. Combined with motional stark effect (MSE) diagnostics, the BES could assess the radial electric field and the safety factor, which plays an important role in plasma control and impurity transport processes. A Simulation of Spectra...
Go to contribution page -
M. Jia (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1029.pdfThe three-dimensional edge plasma transport with resonant magnetic perturbations (RMPs) in EAST is simulated with plasma responses being considered. This work is motivated by the significance of understanding plasma responses for optimizing edge localized mode (ELM) control and steady-state divertor flux control by...
Go to contribution page -
E. Marenkov (EPS 2019)12/07/2019, 14:00
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1030.pdfIntense heat loads on the plasma-facing components (PFC) of tokamaks during transient events such as Type I ELMs and disruptions may result in melting and evaporation of the materials. The evaporated impurity cloud ionizes and serves as a shield reducing heat loads on the PFC. Since accurate estimates of the power fluxes...
Go to contribution page -
C. Meineri (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1031.pdfTwo of the biggest challenges for future fusion reactors are the power dissipation and erosion of diverter targets. Alternative configurations such as Snowflake [1] (SF) and the Quasi-snowflake family (QSF), including Two Null nearby divertor [2] (TNND), have the aim of controlling and optimising the magnetic flux...
Go to contribution page -
F. Militello (EPS 2019)12/07/2019, 14:00MCF
See full abstract:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1032.pdfIn magnetic confinement devices, boundary turbulence is responsible for transporting plasma and energy from the well-confined region towards the material surfaces where it can severely harm reactor relevant machines. It is therefore essential to develop a solid understanding of the mechanisms behind the transport in the edge...
Go to contribution page -
D. Nina (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1033.pdfThe edge electron density at the midplane is a very important interface parameter between core (associated with fusion performance) and divertor plasma (able to control power exhaust). The separatrix density is also essential to assess the pedestal stability and has been observed to be related with the plasma energy...
Go to contribution page -
J. Dominguez-Palacios12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1034.pdfRecent experiments have shown that Edge Localized Modes (ELMs) can have a strong impact on the fast-ion population, causing significant losses and/or acceleration [1, 2]. These findings motivate a kinetic study of the interplay between fast-ions and ELMs. For this purpose, the 3D hybrid kinetic-MHD code MEGA [3] has been...
Go to contribution page -
T.H. Osborne (EPS 2019)12/07/2019, 14:00MCF
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1035.pdfThe Small Angle Slot (SAS) divertor installed on DIII-D combines high closure with small incidence angle to achieve detachment over the entire divertor at low density. Experiments on DIII-D comparing divertor detachment and other divertor characteristics of the SAS configuration to an otherwise identical open divertor...
Go to contribution page -
A. Pearce (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1036.pdf
As conceptual design options for a demonstration fusion power plant (DEMO) are explored it is important to understand the design space for possible non-ITER like design options. The power exhaust is a key design driver for a fusion power plant, and puts strong constraints on the size of the machine. One candidate for an...
Go to contribution page -
A.A. Pshenov (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1037.pdf
The power and particle exhaust are among the key problems to be solved for successful operation of ITER and DEMO [1]. The conventional solid plasma-facing component (PFC) solution suffers from numerous drawbacks such as material erosion and degradation under severe power, charged particle and neutron fluxes, possible...
Go to contribution page -
A. Punjabi (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1038.pdf
The nested magnetic surfaces that confine a fusion plasma can be designed to be bounded by a limiter or a divertor. For a limiter, confining surfaces extend until they intercept a part of the surrounding structure. For a divertor, an outermost confining magnetic surface exists which is well separated from the surrounding...
Go to contribution page -
G. Rubino (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1039.pdf
The operational conditions of DEMO require a high density and a high fraction of power radiated in the Scrape-Off Layer in order to fullfill the strict limits imposed by the material and the necessity to work in detached conditions. Indeed, almost the 95% of the input power must be radiated [1]. Various experiments in JET...
Go to contribution page -
S. Shu (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1040.pdf
Previous experimental results from the Experimental Advanced Superconducting Tokamak (EAST) have shown that the lower hybrid wave (LHW) can induce a 3D magnetic topology change at the plasma boundary, thus affect significantly the edge plasma transport and divertor heat flux distribution [1, 2]. To investigate further the...
Go to contribution page -
B. Tal (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1041.pdf
Edge localized modes (ELMs) are typically considered as major concerns for the main chamber wall. However, other smaller but more frequent events, so called inter-ELM bursts, which appear between type-I ELMs, could also harm the plasma-facing components. Although they only occasionally appear in the JET scrape-off layer in...
Go to contribution page -
I. Vasina (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1042.pdf
Liquid lithium is considered as a material for plasma facing components (PFCs) of fusion devices. Its properties have been widely studied at present. In particular, the lithium program of T-11M tokamak is focused on solving the technological problems of creating a stationary tokamak with plasma-facing components from...
Go to contribution page -
M. Wensing (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1043.pdf
The effect of the upcoming TCV divertor upgrade on the distribution of neutrals and the onset of detachment is studied using 2D transport simulations. The divertor upgrade is centered around the installation of a gas baffle to form a closed divertor chamber [1]. SOLPS-ITER simulations predict that the baffle geometry...
Go to contribution page -
F. Wilczynski (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1044.pdf
In magnetic confinement devices, the boundary turbulence is characterised by intermittent ejection of coherent filamentary structures. These filaments transport plasma from the well-confined core region, through the Scrape-Off Layer (SOL), towards the material surfaces. This results in increased plasma-wall interaction,...
Go to contribution page -
K. Wu (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1045.pdf
AST has implemented the feedback control of the radiated power to protect divertor target plates from overheating in H-mode long pulse discharges [1]. Since now, by the real-time control system it has been obtained a radiative fraction up to 40%, and it was found the neon (Ne) gas one of the best choices as the additional...
Go to contribution page -
G. Zhuang (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1046.pdf
Multifaceted asymmetric radiation as well as strong poloidal asymmetry of the electron density from the edge, dubbed as `MARFE', has been observed in high electron density Ohmically heated plasmas on J-TEXT tokamak. While the plasma density increasing further, it is found that the MARFE sometimes moves poloidally and...
Go to contribution page -
S. Okamura (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1047.pdf
CFQS is a new stellarator program proposed in China with the magnetic configuration of the quasi-axisymmetry. This program is an international joint project (NSJP) conducted by NIFS (National Institute for Fusion Science), Japan and SWJTU (Southwest Jiaotong University), Chengdu China. The number of toroidal period is 2...
Go to contribution page -
M. Roberto (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1048.pdf
To simulate magnetic configuration in tokamaks like ITER, we use a wires model consisting of electric currents in five parallel infinite wires to obtain double-null magnetic surfaces with specific choices of magnetic axis position, triangularity and elongation. This model reproduces quite well the ITER configuration and it...
Go to contribution page -
G. Avdeeva (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1049.pdf
The penetration depth of neutrals in fusion plasma determines the fueling efficiency of the applied puffing method. Experiments have proven higher efficiency of SMBI (supersonic molecular beam injection)[1] compare to GP (gas puffing), that can be explained by a high direct velocity of molecules and domination of...
Go to contribution page -
W. Lee (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1050.pdf
The Kubo number is estimated based on the correlation analysis of the density fluctuations measured by the 2D beam emission spectroscopy system in KSTAR. The Kubo number defined as an autocorrelation time of the fluctuating quantities normalized by the eddy turn over time characterizes significance of the nonlinear...
Go to contribution page -
S. Sridhar (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1051.pdf
Disruptions are a major threat to future tokamaks like ITER and beyond. In addition to heat and electromagnetic (EM) loads, disruptions also generate runaway electron (RE), tens of MeVs electron beams which may damage plasma facing. The current ITER disruption mitigation strategy is first to mitigate disruption heat/EM...
Go to contribution page -
G.G. Grenfell (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1052.pdf
The radial electric field (Er) is a crucial parameter to control transport both in tokamaks and in stellarators. Its local value is result of the interplay between neoclassical (NC) and turbulent mechanisms. In stellarators, the edge radial electric field changes its sign in a continuous manner during the electron (Er > 0)...
Go to contribution page -
Y. Li (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1053.pdf
Measurement of edge ion temperature is critical to understand the underlying physics of the island configuration effect on the plasma transport. Here, the Ti profile at the plasma boundary has been successfully measured on W7-X during the last experimental campaign OP1.2b by a retarding field analyzer (RFA) probe. The RFA...
Go to contribution page -
B. López-Miranda (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1054.pdf
Wall conditioning in TJ-II, is regularly performed by Glow Discharge deposition of B films and Li evaporation from ovens located inside the vacuum chamber [1]. In order to tests in-situ, real-time conditioning techniques, a Nd-YAG laser (normally used for Laser Blow-Off studies [2] and LIBS [3]) is used to ablate lithium...
Go to contribution page -
J. Fontdecaba (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1055.pdf
The majority ions present in Electron Cyclotron Resonance (ECR) heated plasmas in the stellarator TJ-II are heated through collisions with electrons. Since there is no direct heating of plasma ions in this device their thermal distribution is expected to be Maxwellian. However, during recent experiments in TJ-II a...
Go to contribution page -
K.J. McCarthy (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1056.pdf
Cryogenic pellet injection (PI) is a well established fuelling tool used on most mediumand large-sized magnetically confined plasma devices. PI technologies are mature and such systems are earmarked as critical items for future reactors. Nonetheless, despite significant progress over recent decades, a complete...
Go to contribution page -
N. Rust (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1057.pdf
This work presents details of the Wendelstein W7-X stellarator Neutral-Beam-Injector (NBI) system, and its effect on the beam dump, duct, heat efficiency and plasma current. During the last stellarator W7-X operation phase, the first of two NBI injectors (NI21) was taken into operation. It was equipped with two hydrogen...
Go to contribution page -
M. Zanini (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1058.pdf
The optimized stellarator W7-X generates its rotational transform by means of 70 superconducting coils. Therefore, no toroidal current is necessary for plasma confinement. Up to 10 gyrotrons can be used for electron cyclotron current drive (ECRH) and, in case of oblique beam injection, it is possible to drive a net current...
Go to contribution page -
A. Bencze (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1059.pdf
Early turbulence measurements in W7-X stellarator by means of poloidal correlation reflectometry [1] have revealed some important characteristics of turbulent density fluctuations such as the perpendicular ExB velocity and the decorrelation times in low density (0.6 10^19 - 2 10^19 m^-3) discharges. In a more recent study...
Go to contribution page -
A. Buzás (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1060.pdf
Various low frequency (~200 Hz) edge fluctuations were observed on the W7X stellarator. ELM-like events in ''high iota'' discharges[1] were seen on multiple diagnostics and an oscillation in the gradient of the light profile of the A-BES signal during FTM configurations. This profile variation is in strong correlation with...
Go to contribution page -
Z. Huang (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1061.pdf
Measurement of the edge radial profile of magnetic fluctuation is a basic and crucial method to investigate the edge turbulence and transport. A set of pick up coils, located in the combined probe head and mounted on the multi-purpose manipulator, has been used to measure the magnetic fluctuation in the scrape-off layer...
Go to contribution page -
C. Killer (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1062.pdf
In the Wendelstein 7-X Scrape-Off Layer (SOL), turbulent (radial) transport is assumed to play an important role for heat and particle transport to the divertor due to the generally long connection lengths of a few 100 m. The existence of large magnetic islands at the plasma edge results in a complex three-dimensional...
Go to contribution page -
A. Langenberg (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1063.pdf
This paper reports on trends for impurity transport with respect to different impurity species as observed in hydrogen plasmas of W7-X. Measurements of the impurity transport times τ_I [1] show a very similar impurity transport behaviour for a wide range of different impurities under the variation of the atomic number Z as...
Go to contribution page -
T. Ullmann (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1064.pdf
Since in magnetically confined fusion plasmas the evolution of transport barriers at the transition from the low to high confinement regime is accompanied by E × B shear flows, their interrelation with transport producing drift-wave (DW) turbulence has attracted much interest. In the Hasegawa-Mima model the redistribution...
Go to contribution page -
L. Vanó (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1065.pdf
The first absolute impurity density profiles of the optimised stellarator Wendelstein 7X (W7-X) plasma core will be presented and investigated under different operating scenarios. The profiles are derived from the Charge Exchange Recombination Spectroscopy (CXRS) diagnostic that observes the Neutral Beam Injection (NBI)...
Go to contribution page -
A. Hallenbert (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1066.pdf
An intriguing phenomenon, likely to be of relevance in future fusion devices operating at or near beyond the threshold of marginal ITG-stability, is the Dimits upshift, where close above the linear threshold stabilising zonal flow shear nearly complete suppress these modes. The general features of this phenomenon are...
Go to contribution page -
K. Hammond (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1067.pdf
Particle drifts are known to affect the fluxes of heat and particles to plasma-facing components of both tokamaks and stellarators. Here we present results from the first dedicated study of edge drift effects in W7-X scrape-off layer plasmas. In these experiments, similar discharges were repeated with forward and reversed...
Go to contribution page -
A. Casolari (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1068.pdf
Runaway electrons (RE) represent one of the main obstacles to the successful operation of ITER [1]. During plasma diruptions, the structure of magnetic surfaces is broken and large regions of stochastic magnetic field are created; however, the rapidly reforming magnetic flux tubes are able to trap RE for a long time [2]....
Go to contribution page -
3609. P5.1069 Inner versus outer ExB shear layer: an attempt to radially localize the L-H transitionM. Cavedon (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1069.pdf
The importance of the E × B flow shear in the transition from the low (L-) to the high (H-) confinement mode is well and widely appreciated [1]. At the edge of tokamaks, the E × B velocity profile shows two shear layers: the "inner" one is located within the confined region and is related to the ion pressure gradient while...
Go to contribution page -
J. Dominski (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1071.pdf
The neoclassical tungsten impurity transport is studied with the gyrokinetic neoclassical code XGCa [1,2] in whole volume JET plasma, from magnetic axis to scrape-off layer (SOL). Instead of simulating all 74 tungsten charge states, they are bundled and treated as several separate species. It is found, in a model JET...
Go to contribution page -
H. Du (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1072.pdf
The short wavelength ion temperature gradient (SWITG) driven instability in tokamak plasmas with hollow density profiles is numerically investigated by using the gyrokinetic integral eigenmode equation. It is found that for the hollow density profile (negative R / L_n , ), there exists a critical ion temperature gradient R...
Go to contribution page -
W. Guo (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1073.pdf
Turbulent impurity transport driven by parallel velocity shear (PVS) turbulence in hydrogen isotope plasmas is studied using the gyrokinetic theory in a slab configuration with weak magnetic shear. The quasi-linear impurity flux written in terms of diffusion and convection is analytically derived. It is found that PVS...
Go to contribution page -
A. Ho (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1074.pdf
The most widely accepted models for plasma turbulent transport are based on gyrokinetic (GK) theory, but the computational times of full nonlinear GK codes prohibit their use for applications such as experimental scenario optimization and control-oriented modelling. Reduced formulations of these equations have resulted in...
Go to contribution page -
D. Kouprienko (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1075.pdf
In contrast to theory expectations, the hydrogen isotope effect results in the improvement of tokamak energy confinement in numerous experiments as the hydrogen isotope mass increases, which has remained a long-standing puzzle [1]. This effect is beneficial and important for the success of Iter, where a fuel mixture of...
Go to contribution page -
N. Kumar (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1076.pdf
Transport of tungsten (W) in the central part of ITER is expected to be determined by neoclassical and turbulent processes, which strongly depend on the main ion density, temperature, and rotation profiles. Thus, to predict the W core transport behaviour, one needs to know the transport processes determining the density...
Go to contribution page -
T. Lan (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1077.pdf
In the common transport model, the anomalous transport is believed to be attributed to the plasma turbulence. The ExB shearing flow suppress the turbulence to reduce the radial
Go to contribution page
transport. The formation of the transport barrier makes a very strong ExB shear to achieve the high confinement state (H-mode). The radial... -
M. Nurgaliev (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1078.pdf
The aim of this work is the determination of parametric dependencies of anomalous ion and electron heat conductivities in whole operational space of the T-10 tokamak. Verified experimental data base of plasma parameters, heat fluxes, and transport coefficients is made. It allow us to perform a background for transport...
Go to contribution page -
H. Cai12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1079.pdf
The evolution of neoclassical tearing modes (NTMs) in the presence of electrostatic drift wave turbulence is investigated. In contrast with anomalous transport effect induced by turbulence on NTMs, a new mechanism that turbulence-driven current can affect the onset threshold of NTMs significantly is suggested. Turbulence...
Go to contribution page -
J. Promping (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1080.pdf
This work uses an integrated predictive simulation code CRONOS to simulate plasma profiles of JET discharge. Simulations are carried out with ion and electron temperatures, electron density and toroidal velocity profiles predicted both individually and simultaneously. Core transport models used in these simulations is a...
Go to contribution page -
E.R. Solano (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1081.pdf
Much of the information on the isotope scaling of the L-H transition power threshold, P_LH, in JET is derived from early experiments in Hydrogen (H), Deuterium (D) and Tritium (T) with C wall (JET-C) [1]. More recent experiments have studied P_LH(H) and P_LH(D) in JET-C [2,3] and JET-ILW [4], and have shown considerable...
Go to contribution page -
A. Telnova (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1082.pdf
The presentation is devoted to particle and heat flux study in the Globus-M2 tokamak [1]. Globus-M2 is a spherical tokamak with the major radius R = 0.36 m and the minor radius a = 0.24 m (aspect ratio A = 1.5), and is the upgraded version of the Globus-M tokamak [2]. The upgrade allows increasing the plasma current I_P up...
Go to contribution page -
M. Valisa (EPS 2019)12/07/2019, 14:00
See the full abstract here: http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1083.pdf
Increasing the heating power in both baseline and hybrid JET H-mode scenarios modifies the edge kinetic profiles in a way that progressively reduces the neoclassical inward velocity of impurities [1]. Along this path JET approaches the situation expected in ITER where heavy impurities should be repelled at the H mode...
Go to contribution page -
G. Tardini (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1084.pdf
Heat transport in tokamaks is widely believed to be dominated by turbulence associated with gradient-driven modes. As a consequence, temperature profiles tend to clamp to a critical logarithmic gradient, weakly reacting to additional heating. The extent of this so-called "profile stiffness" is, however, different...
Go to contribution page -
X. Yang (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1085.pdf
W (Tungsten) accumulation in the core plasma could cause largely increased radiation because of its high cooling rate, which severely restricts long-pulse operation. In this context, WEST has achieved 30s L-mode pulses without any sign of W accumulation. The discharges were performed on the upper divertor in a full W...
Go to contribution page -
X. Zhang (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1086.pdf
Recent experiments on the EAST tokamak have extended the high-βN scenario towards the steady-state burning plasma regime by combination of NBI heating and LHW injection to obtain ~100% non-inductively-driven operation. By employing a very broad current profile, the negative magnetic shear leads to a high normalized...
Go to contribution page -
B. Luce (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1087.pdf
A tokamak has theoretically a toroidally symmetric magnetic field. However, the magnetic field is never perfectly homogeneous in the toroidal direction. The 2 most common reasons for non axisymmetric fields are engineering limitations and voluntary perturbations applied by additional coils for control purposes. The...
Go to contribution page -
T. Luda di Cortemiglia (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1088.pdf
The design of future fusion reactors and their operational scenarios require accurate estimates of the plasma confinement, which is a key parameter for the evaluation of the fusion performance. We are developing a new model that integrates different elements describing the main physics phenomena which determine plasma...
Go to contribution page -
A. Lyashenko (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1089.pdf
Turbulent dynamics of tokamak edge plasma related to convective motion of filamentary structures, or blobs, plays an important role in determining the heat and particle fluxes coming from core plasma to the first wall of the machine [1]. Combined with the problem of plasmasurface interaction and tritium retention in...
Go to contribution page -
A.V. Melnikov (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1090.pdf
An ExB drift poloidal rotation is now considered as an effective mechanism to suppress the plasma instabilities [1]. So, the direct radial electric field Er studies are important ingredient for understanding the role of E_r x B_t shear poloidal rotation in the turbulence suppression. In the -10 tokamak, the mean values...
Go to contribution page -
D. Réfy (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1092.pdf
The evolution of the edge plasma current in magnetically confined plasmas is identified as a critical parameter of Edge Localized Mode (ELM) destabilization. While the plasma pressure gradient, the other critical parameter, is routinely measured with high spatial and temporal resolution on fusion experiments, the...
Go to contribution page -
H. Raj (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1093.pdf
Formation of relativistic runaway electrons (REs) beam during plasma disruption, which can seriously damage the first wall, is a major threat to the safety of large tokamaks like ITER. In order to suppress the disruption-generated runaway beam, techniques such as massive gas injection, resonant magnetic perturbations...
Go to contribution page -
R.W. Schrittwieser (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1094.pdf
Blob transport is subject to intense study in fusion energy research for the understanding and prediction of particle and heat fluxes onto the plasma-facing components (PFC) [1]. Blobs originate around the separatrix at the outer midplane, forming filaments which expand and propagate in the parallel and, respectively,...
Go to contribution page -
A.Y. Sharma (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1095.pdf
Tokamak turbulence exhibits interaction on all length scales, but standard gyrokinetic treatments consider global scale flows and gyroscale flows separately, and assume a separation between these length scales. However, the use of a small-vorticity ordering [1, 2] allows for the presence of large, time-varying flows on...
Go to contribution page -
D. Smirnov (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1096.pdf
This paper continues our research on nonlinear low-frequency turbulent convection and associated anomalous cross-field transport processes of tokamak core plasmas [1]- [4]. Numerical simulations are performed with code CONTRA-C, which is developed in the frame of simplified cylindrical model for tokamaks [2]. The...
Go to contribution page -
A. Von Stechow (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1097.pdf
The Wendelstein 7-X superconducting stellarator at IPP Greifswald has a neoclassically optimized magnetic field, such that turbulent transport can be a major loss channel. Its variable three-dimensional field geometry is expected from analytical and numerical models to provide venues to modify both spatial localization...
Go to contribution page -
W. Wang (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1098.pdf
Global gyrokinetic simulations with self-consistent coupling of neoclassical and turbulent dynamics show that turbulence can significantly affect plasma self-driven mean current generation in tokamaks. The current amplitude, profile and phase space structure can all be modified. Turbulence can significantly reduce the...
Go to contribution page -
L. Guazzotto (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1099.pdf
A standard figure of merit for magnetic-confinement nuclear fusion experiments is expressed through the Lawson criterion [1]. The criterion gives the value for the "triple product" of plasma density, temperature and energy confinement time that must be reached in order for the plasma to ignite, i.e. to continue...
Go to contribution page -
M. Eder (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1100.pdf
A three-dimensional integrator for guiding center orbits of charged particles in toroidal fusion devices with 3D field geometry is described. The integrator uses a representation of the electromagnetic field by low order polynomials on a 3D tetrahedal grid and is intrinsically designed to preserve the total energy,...
Go to contribution page -
J.E. LÌ_pez (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1101.pdf
The study of plasma dynamics is the main tool for both the description and control of Tokamak devices for thermonuclear fusion systems, which has been carried out mainly by computational simulation techniques. The magnetohydrodynamic (MHD) equilibrium of the plasma is the starting point for the study of...
Go to contribution page -
C. Mazzotta (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1102.pdf
FTU offers the unique opportunity to explore a broad range of collisionality [1] expressed as ν_eff = 0.1 Zeff 〈ne〉 R / 〈Te〉^2.
Go to contribution page
This work is devoted to study the dependence of the electron density profiles and peaking in a low collisionality regime, more interesting for comparison with other tokamaks [2]. With respect... -
R. Paccagnella (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1103.pdf
The RELAX device is a low aspect- ratio ( with R/a=2 where R and a are the major and minor radius of the torus) Reverse Field Pinch (RFP) in which on-axis resonant helical modes with m=1 and n=4 (m and n being the poloidal and toroidal mode numbers respectively) are observed during the so called Single Helical (SH)...
Go to contribution page -
3645. P5.1105 Design of neutron and gamma ray measurements for the start-up phase of the DTT tokamakM. Angelone (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.1105.pdf
The Divertor Tokamak Test (DTT) facility, which is under design for construction in Frascati (Italy), will produce neutron yield up to 1.3*10^17 n/s at full power (H-mode scenario). This calls for an accurate design and selection of the 2.5 MeV neutron diagnostic systems and detectors which can give the fill...
Go to contribution page -
M. Issanova (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2001.pdf
Investigation of interaction processes of ion beams with dense plasmas is one of the key problems in physics of inertial confinement fusion driven by heavy ion beams [1]. The stopping power is an important quantity used to describe the interaction of particle beams with matter. In the field of particle-driven inertial...
Go to contribution page -
A.V. Branitskiy (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2002.pdf
The results of plasma compression studies of nested wire and fiber arrays with current flowing through them are presented in this work. Experiments were made on the Angara-51 installation with current up to 4 MA. The current implosion of nested arrays represents a unique opportunity to simulate the interaction of a...
Go to contribution page -
I.E. Golovkin (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2003.pdf
We present new features of PROPACEOS, a code that generates equation-of-state (EOS) and opacity tables for radiation-hydrodynamics and spectroscopic simulations. In addition to existing capabilities to produce tables for LTE and optically thin NLTE plasmas, these new features allow PROPACEOS to perform calculations...
Go to contribution page -
Z. Moldabekov (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2004.pdf
Advances on dense plasma diagnostics using X-ray scattering techniques [1] have allowed one to gain insight into the ionic dynamics at extreme conditions. As a result, properties such as the ion acoustic dispersion and corresponding sound velocity in dense plasmas and warm dense matter can be probed experimentally....
Go to contribution page -
B. Cho (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2005.pdf
The recent advent of the XFEL allowed us to follow ultrafast electron dynamics in the HED matter. We used femtosecond pulses from the PAL-XFEL to measure the ultrafast changes in the X-ray absorption of Cu nanofoil excited by intense laser pulses. Upon exposure to laser irradiation, significant portions of both the s/p...
Go to contribution page -
G. Kagan (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2006.pdf
Experiments are indicative of substantial kinetic effects in high-energy-density plasmas during the course of a spherical implosion. The effects appear as the plasma mean-free-path grows relative to the background scale making standard rad-hydro single-fluid description invalid. To understand their mechanics and...
Go to contribution page -
S. Kulkarni (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2007.pdf
SPECT3D is a collisional-radiative spectral analysis package designed to compute detailed emission, absorption, or x-ray scattering spectra, filtered images, XRD signals, and other synthetic diagnostics. The spectra and images are computed for virtual detectors by post-processing the results of hydrodynamics...
Go to contribution page -
M. Kucharik (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2009.pdf
Hydrodynamic simulations of laser-produced plasmas represent a useful tool both for theoreticians and experimentalists allowing them to investigate processes during laser-plasma interaction, which are often impossible to observe directly during the experiments. They allow not only interpretation of experimental...
Go to contribution page -
J. Nikl (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2010.pdf
The description of the energy transport processes in the laser plasma is crucial for capturing the dynamics of the lasertarget interaction relevant to shock ignition [1] and pre-pulses of ultra-intense lasers [2]. The diffusion approximation of the heat and radiation transport become inadequate even for the laser...
Go to contribution page -
C. Fiedler Kawaguchi (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2012.pdf
Hydrodynamic instabilities, such as the Rayleigh-Taylor (R.-T.) instability develop in high energy density, inertial confinement fusion (ICF) experiments. These instabilities degrade the implosion due to mixing of the fuel. We study R.-T. modes in ICF implosions in order to better understand how they evolve in time. To...
Go to contribution page -
S.H. Batha (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2014.pdf
Experimental, theoretical, simulation, and technological advances over the past 30 years are motivating a reassessment of the Magnetic Indirect Drive (MID) approach to Inertial Confinement Fusion (ICF). In this concept,1,2 a radiation source drives a hohlraum to temperatures required to implode a capsule symmetrically...
Go to contribution page -
V.N. Golovkina (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2015.pdf
The 3-D view factor code VISRAD is widely used in designing HEDP experiments at major laser and pulsed-power facilities, including NIF, OMEGA, OMEGA-EP, ORION, LMJ, Z, and PLX. It simulates target designs by generating a 3-D grid of surface elements, utilizing a variety of 3-D primitives and surface removal algorithms,...
Go to contribution page -
Z. Li (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2016.pdf
Laser-driven high-Z hohlraum is used to provide intense x-ray radiation source for driving the capsule implosion in indirect-dirve inertial confinement fusion (ICF). With the campaigns of hohlraum energetics and implosion physics in NIF, the lack of advanced knowledge on laser-hohlraum coupling process has shown the...
Go to contribution page -
S. Atzeni (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2017.pdf
Exploding pusher targets, i.e. gas-filled, large aspect-ratio shells, driven by a strong lasergenerated shock, are widely used as pulsed sources of neutrons and fast charged particles. Due to small convergence ratio, exploding pushers are little affected by fluid instabilities and are weakly sensitive to irradiation...
Go to contribution page -
G.C. Burdiak (EPS 2019)12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2018.pdf
We describe a newly commissioned pulsed-power machine, "M3", for driving high energy density physics experiments at First Light Fusion. 2.5 MJ of stored electrical energy is discharged in 2 us, generating currents of up to 14 MA into a low-inductance load. The primary purpose of M3 is to launch high velocity...
Go to contribution page -
M. Moreira (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2019.pdf
Beam hosing is a transverse beam-plasma instability that causes the centroid of a beam to oscillate with increasing amplitude and can therefore lead to the disruption of the beam as it propagates in plasma [1, 2, 3]. This instability can jeopardize those novel accelerator concepts which are based on plasma wakefields...
Go to contribution page -
R.A. Altuijri (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2020.pdf
A promising scheme for plasma wakefield acceleration is the hybrid plasma acceleration mechanism, which is experimentally connected to world-wide programs at various accelerator facilities. This scheme may lead to extremely high quality electron bunches, which can be used to drive ultrabright light sources such as free...
Go to contribution page -
B.F. Malaca (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2021.pdf
One of the most promising technologies to form the next generation of compact particle accelerators is plasma acceleration, providing accelerating distances up to 3 orders of magnitude shorter than conventional accelerators. Recent progress has been tremendous but improving beam quality still remains as a grand-challenge...
Go to contribution page -
R.A. Fonseca (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2022.pdf
The OSIRIS [1] Electromagnetic particle-in-cell (EM-PIC) code has been widely used in the numerical modeling of many astrophysical and laboratory scenarios. Since the release of version 4.0, the framework has been continuously developed to support multiple hardware architectures, and to extend the base algorithm, allowing...
Go to contribution page -
R. Calado (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.2023.pdf
Particle-in-Cell (PIC) codes are used in almost all areas of plasma physics, such as fusion energy research, plasma accelerators, space physics, ion propulsion, and plasma processing, and many other areas. In this work, we present the recent developments of the ZPIC educational code suite, a new initiative to foster...
Go to contribution page -
H. Lee (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3001.pdf
Studies on the plasma parameters and electron heating mechanism were investigated in the RF biased inductively coupled plasmas (ICPs), which are widely used and studied in various industrial plasma processes and laboratory research, by using careful plasma diagnostic techniques. In RF biased ICP (ICP+CCP), as the RF bias...
Go to contribution page -
N. Zorina (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3002.pdf
This work is devoted to the diagnostic of high frequency electrodeless light sources (HFEDL) for their use in high precision atomic absorption analyzers. The arsenic discharge is studied. The diagnostic technique consists of the line profiles measurements by means of Fourier transform spectrometer and Jobin Yvon SPEX 1000M...
Go to contribution page -
I.F. Punanov (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3003.pdf
In this work we study plasma beams generated by 70-kV 30-ns vacuum surface flashover discharge. The aim of the work was to compare parameters of particle flows at different values of discharge current and reveal the dependence of particle flow power on current. We used a pulsed generator with coaxial glycerol-filled...
Go to contribution page -
L.T. James (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3004.pdf
The ion drag force is one of the dominant forces determining the motion of dust particles in tokamak edge plasmas. We might expect that, in the same way that current onto a dust grain is suppressed by strong magnetic fields [1], the momentum flux will be also. However, the ion drag models employed by dust transport codes...
Go to contribution page -
L. Chen (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3005.pdf
The surface of tungsten powder with irregular shape was treated by thermal plasmas and the thermodynamics and dynamics behavior of powder particles in the plasma was monitored by the particle online monitor of DPV2000. The morphologies of the plasma plastic powders was observed by Scanning Electron Microscope (SEM). The...
Go to contribution page -
A. Petrovskaya (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3006.pdf
One of the current nuclear industry problems is irradiated reactor graphite deactivation during decommissioning of nuclear power plants, as well as findings of effective method for decontaminating of nuclear power equipment internal surfaces sedimented with radionuclides from reactor water during operation. Important...
Go to contribution page -
A.V. Ivchenko (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3007.pdf
The implementation of thermonuclear technology requires the development and formation of the reliable, long-lived nuclear fusion systems that will be able to guarantee the safe operation. Meanwhile, interaction plasma with divertor and the reactor first-wall elements leads to damage of their surfaces via erosion process...
Go to contribution page -
H. Chen (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3008.pdf
This study describes the specification, design and fabrication technology of the modified source spectrum filter for the combination of deuterium and halogen lamps light source system. The filter is modified and eliminated. The resulting Alpha deuterium line produces a smoother spectrum of light sources over a wide range...
Go to contribution page -
A. Shumikhin (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3009.pdf
In this work, using the chemical model of the atomic plasma "3+" proposed in [1], we present a joint calculation of the composition, equation of state and transport properties of metal vapors in warm dense matter regime within the unified approach The Helmholtz free energy of dense atomic metal vapors describe the mixture...
Go to contribution page -
A. Veselov (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3010.pdf
In spite of the well-studied microwave discharge and laser, the discharge in the beams of the THz frequency band remains practically unexplored, including the gas breakdown threshold. Nowadays, there is a significant progress in the study of the THz discharge, associated primarily with the development of sources of the...
Go to contribution page -
I. Vasileska (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3011.pdf
The divertor targets in tokamaks are constantly bombarded with high-energy neutral and charged particles and such violent events can pose a serious threat to the long-time resistance of the divertor materials. The wall erosion, caused by the bombardment, releases impurities, that migrate towards the bulk plasma and due to...
Go to contribution page -
M. Ugoletti (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3012.pdf
Neutral beam injectors (NBIs) are one of the most important additional heating devices both in present and in future nuclear fusion experiments. In order to heat the plasma at the high temperatures required, several critical aspects need to be fulfilled in the design of future NBI. In particular, one issue is the...
Go to contribution page -
S. Kuhn (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3013.pdf
Go to contribution page -
S. Schütt (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3014.pdf
Dusty plasmas typically contain one species of monodisperse dust particles. Experiments under microgravity conditions allow to study the dynamics of individual particles in three dimensionally extended systems. Adding a second species of monodisperse particles of different size allows to study phase separation processes....
Go to contribution page -
D. Fursa (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3015.pdf
Electron-impact excitation of the singlet states of H2 will either lead to dissociation through the excited singlet spectrum, or radiative decays to the vibrational levels of the ground electronic state. Decays to bound levels are one of the dominant processes by which vibrationally-excited H2 is formed in plasmas, which...
Go to contribution page -
I. Park (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3016.pdf
To understand dissociative recombination (DR) of positive ions at plasma-metallic walls is a key to control plasmas in fusion edge plasma, material processing and plasma bio-medicine. Especially, a product of DR would generate ozone (O3) as both positive effects (sterilization of germs) and negative effects (toxic to...
Go to contribution page -
N. El amine (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3018.pdf
A nonlinear model of void formation is proposed that includes the dust grain charge variation along with the grain-grain interaction and the effect of neutral density. It is found that the extension of the void decreases if the dust particulate charge is taken into account. Moreover, for bigger dust grains, it is seen that...
Go to contribution page -
T.I. Morozova (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3019.pdf
Waves and instabilities in a near-surface plasma above Phobos and Deimos are discussed. It is shown that the disturbance of the isotropy of the distribution function of electrons in dusty plasma above the surface of Mars satellites is associated with the movement of the solar wind relative to photoelectrons and charged...
Go to contribution page -
C. Duée12/07/2019, 14:00
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.3020.pdf
Forbidden in french constructions since 1997, asbestos remains present in most of the buildings constructed before this date. Thus, during work or in case of degradation, asbestos fibres can be emitted in air. The smaller the asbestos particles, the longer they stay ...
Go to contribution page -
V.G. Panchenko (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4001.pdf
The process of plasma radiation is studied when the transformation of an longitudinal Langmuir wave into the transverse electromagnetic wave occurs. The transformation takes place on turbulent plasma fluctuations in the presence of upper hybrid pump wave parametric instability. We consider the parametric decay of such wave...
Go to contribution page -
S. Changmai (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4002.pdf
We would be reporting about the preliminary results of the analysis using Particle In Cell (PIC) simulation on properties of photoemissive sheath in the presence of a magnetic field. Our present investigation reveals that the photoemission from a wall can induce electron twostream instability (ETSI) within the...
Go to contribution page -
M. Dwivedi (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4003.pdf
In the present work, the non-linear propagation of multi-Gaussian beam, consisting of coherent Gaussian beams with similar distribution [1], has been studied in collision-less plasma in the relativistic regime. We investigated the stimulated Raman scattering (parametric instability) of electromagnetic wave pulse and the...
Go to contribution page -
S. Punia (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4004.pdf
We have developed an analytical model to control the angular momentum of electrons trapped in ultra-relativistic laser-plasma interaction. The energy coupling from laser to plasma can be enhanced by using the foam target which regulates the near-critical density more efficiently in the medium. When laser is incident on the...
Go to contribution page -
V. Karakhtanov (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4005.pdf
Within the linear response theory in the formulation of Zubarev [1, 2] the modification of electron-ion and electron-electron correlation functions is made with the account of local field corrections in the dielectric function [3]. Recently the Chebyshev polynomial expansion of the Fermi distribution functions was...
Go to contribution page -
T. Vinci (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4006.pdf
SMILEI [1,2] is an open-source, collaborative Particle-In-Cell (PIC) code co-developed by plasma physicists and high-performance computing (HPC) specialists. Thanks to its userfriendly (Python) interface, built-in diagnostics and visualization tools, SMILEI can be used not only for research but also as a teaching...
Go to contribution page -
A. Paul (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4007.pdf
Supersolitons are qualitatively different solitary structures from conventional solitons in terms of the potential profile and the phase portrait of the corresponding dynamical system. It has been established that the existence of a soliton after the formation of double layer confirms the existence of a sequence of...
Go to contribution page -
X. Mushinzimana (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4008.pdf
Negative ion plasmas are observed in space and astrophysical environment (D and F layers of Earth's Ionosphere, Titan's atmosphere, Cometary comae) and in laboratory plasmas (e.g. plasmas processing reactors). In such plasmas, propagation of ion acoustic solitary waves have been observed experimentally in laboratory by...
Go to contribution page -
M. Khusroo (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4009.pdf
In a protoplanetary disk (PPD) system, the magneto-rotational instability (MRI) driven turbulence produces a strong electric field in the neutral co-moving frame when the ionization degree is low [2]. This electric field leads to plasma heating at some parts of a weakly ionized protoplanetary disk, which results in an...
Go to contribution page -
G. Inchingolo (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4010.pdf
The magnetorotational instability (MRI) is a crucial mechanism of angular momentum transport in several astrophysical scenarios, like accretion disks around black holes [1]. The MRI has been widely studied using MHD models and simulations, in order to understand the behavior of astrophysical fluids in a state of...
Go to contribution page -
C.R. Straub (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4011.pdf
Magnetic activity of distant objects can manifest itself in electron cyclotron emission. While it was detected from a large number of stellar objects (including pulsars) and brown dwarfs, not detection does not necessarily mean it does not happen. Being a highly directed radiation, it leaves the magnetospheres shaped as...
Go to contribution page -
J. Tsai (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4013.pdf
Under increasing driving and through modulation instability, the transition from the ordered wave to the weakly disordered wave state occurs in various nonlinear waves. The emergence of fluctuating topological defects at the sites with null amplitude and undefined phase leads to the name of defect-mediated turbulence (DMT)...
Go to contribution page -
W. Chen (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4014.pdf
In this work, wave turbulence transition from a stable plane wave to wave turbulence through intermediate weakly disordered state is investigated in self-excited 3D dust acoustic waves, composed of negatively charged particles suspended in low pressure RF discharges, through direct observing dust density fluctuations over...
Go to contribution page -
S. Valvis (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4015.pdf
Lower hybrid (LH) radio frequency (RF) waves are used in fusion tokamak devices to generate non-inductively toroidal currents. LH waves are effective in imparting toroidal momentum to electrons in the core of the confined plasma. Since the LH waves are generated by wave guide structures near the wall of a tokamak, the...
Go to contribution page -
U. Kumar (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4016.pdf
A currentless toroidal device (CTD) is one in which plasma is confined by the application of toroidal and vertical magnetic field only resulting in absence of a conventional effective rotational transform. Such devices provide a simple and well diagnosable test-bed for studies related to equilibrium, fluctuations and...
Go to contribution page -
J. Robertson (EPS 2019)12/07/2019, 14:00
See full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/P5.4017.pdf
Understanding the behavior of plasma waves in mixed-species plasmas is important for explaining many observations seen in both space and laboratory plasmas. The addition of a second ion species in a magnetized plasma introduces new behavior in the propagation of waves in the ion cyclotron region, such as the ion-ion hybrid...
Go to contribution page -
D. Batani (EPS 2019)12/07/2019, 16:30
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.014.pdf
Direct-drive "Shock Ignition" is an interesting alternative to the classical approach to ICF investigated on NIF and could relax the problems met on the pathway to ignition. In the conventional approach, hot electrons (HE) are dangerous because they induce target preheating making compression more difficult. In SI,...
Go to contribution page -
K. Ida (EPS 2019)12/07/2019, 17:05Joint Sessions
See the full abstract here http://ocs.ciemat.es/EPS2019ABS/pdf/I5.015.pdf
Interplay between MHD and turbulence is interesting topics in magnetically confined plasma and solar plasma. The fast reconnection of magnetic field in the solar flare is well known but the mechanism is not well understood. Turbulence in the current sheet is a strong candidate to explain the fast reconnection in solar...
Go to contribution page
Choose timezone
Your profile timezone: