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L. Askinazi (EPS 2019)08/07/2019, 14:00MCF
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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...
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R. Dux (EPS 2019)08/07/2019, 14:00MCF
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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...
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T. Fan (EPS 2019)08/07/2019, 14:00MCF
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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...
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G. Castro (EPS 2019)08/07/2019, 14:00MCF
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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 ...
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N. Tamura (EPS 2019)08/07/2019, 14:00MCF
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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...
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A. Gurchenko (EPS 2019)08/07/2019, 14:00MCF
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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...
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N. Lemoine (EPS 2019)08/07/2019, 14:00MCF
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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,
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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
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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 ...
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J. Ayllon-Guerola (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Baruzzo (EPS 2019)08/07/2019, 14:00MCF
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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...
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F. Causa (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Chernyshova (EPS 2019)08/07/2019, 14:00
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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...
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S. Coda (EPS 2019)08/07/2019, 14:00MCF
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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...
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K. Crombe (EPS 2019)08/07/2019, 14:00MCF
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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...
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A. Dal Molin (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Dhyani (EPS 2019)08/07/2019, 14:00MCF
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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...
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J. Galdon-Quiroga (EPS 2019)08/07/2019, 14:00MCF
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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...
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E. Ghorbanpour (EPS 2019)08/07/2019, 14:00MCF
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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...
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D. Gradic (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Hacek (EPS 2019)08/07/2019, 14:00MCF
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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...
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I.A. Khodunov (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Kim (EPS 2019)08/07/2019, 14:00MCF
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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...
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O.L. Krutkin (EPS 2019)08/07/2019, 14:00MCF
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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...
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H. Hezaveh Hesar Maskan (EPS 2019)08/07/2019, 14:00MCF
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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...
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W. Chen (EPS 2019)08/07/2019, 14:00MCF
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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...
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B. Madsen (EPS 2019)08/07/2019, 14:00MCF
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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...
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F. Cianfrani (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Koleva (EPS 2019)08/07/2019, 14:00MCF
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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...
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Z. Wang (EPS 2019)08/07/2019, 14:00MCF
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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....
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L. Yu (EPS 2019)08/07/2019, 14:00MCF
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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...
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D. Brunetti (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Chôné (EPS 2019)08/07/2019, 14:00MCF
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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...
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Y. Chao (EPS 2019)08/07/2019, 14:00MCF
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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...
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Y.M. Duan (EPS 2019)08/07/2019, 14:00MCF
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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)...
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S. Futatani (EPS 2019)08/07/2019, 14:00MCF
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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...
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W. Guo (EPS 2019)08/07/2019, 14:00MCF
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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...
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A. H. Boozer (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Francisquez (EPS 2019)08/07/2019, 14:00
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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...
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Z. Qiu (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Rodrigues (EPS 2019)08/07/2019, 14:00MCF
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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...
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S.A. Sabbagh (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Savrukhin (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Xu (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Zeng (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Delgado-Aparicio (EPS 2019)08/07/2019, 14:00MCF
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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...
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N. Dubuit (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Becoulet (EPS 2019)08/07/2019, 14:00MCF
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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...
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T. Bolzonella (EPS 2019)08/07/2019, 14:00MCF
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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...
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D. Bonfiglio (EPS 2019)08/07/2019, 14:00MCF
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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...
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C. B. Kim (EPS 2019)08/07/2019, 14:00
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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...
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G. Bustos Ramirez (EPS 2019)08/07/2019, 14:00MCF
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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...
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R. Cavazzana (EPS 2019)08/07/2019, 14:00MCF
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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...
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F. Cella (EPS 2019)08/07/2019, 14:00MCF
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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...
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S. Diem (EPS 2019)08/07/2019, 14:00MCF
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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...
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S.N. Gerasimov (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Gobbin (EPS 2019)08/07/2019, 14:00MCF
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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
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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
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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.
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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
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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...
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K. Imada (EPS 2019)08/07/2019, 14:00MCF
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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...
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N. Ivanov (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Simons (EPS 2019)08/07/2019, 14:00MCF
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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...
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I. Be'ery (EPS 2019)08/07/2019, 14:00MCF
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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...
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K. Hallatschek (EPS 2019)08/07/2019, 14:00MCF
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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,...
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F.D. Halpern (EPS 2019)08/07/2019, 14:00MCF
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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...
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D.S. Leontyev (EPS 2019)08/07/2019, 14:00MCF
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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...
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L. Laguardia (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Macha (EPS 2019)08/07/2019, 14:00MCF
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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...
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E. Emdee (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Knolker (EPS 2019)08/07/2019, 14:00MCF
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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...
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N. Bertelli (EPS 2019)08/07/2019, 14:00MCF
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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...
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T. Carter (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Cavenago (EPS 2019)08/07/2019, 14:00MCF
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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...
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U. Fantz (EPS 2019)08/07/2019, 14:00MCF
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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...
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S.K. Hansen (EPS 2019)08/07/2019, 14:00MCF
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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...
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D.A. Hartmann (EPS 2019)08/07/2019, 14:00MCF
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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...
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J.L. Velasco (EPS 2019)08/07/2019, 14:00MCF
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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...
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R.I. Pinsker (EPS 2019)08/07/2019, 14:00MCF
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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...
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A. Popov (EPS 2019)08/07/2019, 14:00MCF
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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...
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S.J. Wukitch (EPS 2019)08/07/2019, 14:00MCF
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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...
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G.L. Falchetto (EPS 2019)08/07/2019, 14:00MCF
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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...
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G. Fuchert (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Honda (EPS 2019)08/07/2019, 14:00MCF
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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...
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E. Schuster (EPS 2019)08/07/2019, 14:00MCF
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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....
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R. Kube (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Hamed (EPS 2019)08/07/2019, 14:00MCF
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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...
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Y. Liu (EPS 2019)08/07/2019, 14:00MCF
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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,...
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L. Schmitz (EPS 2019)08/07/2019, 14:00MCF
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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...
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K.L. van de Plassche (EPS 2019)08/07/2019, 14:00MCF
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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...
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W. Zhong (EPS 2019)08/07/2019, 14:00MCF
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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)...
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A. Bierwage (EPS 2019)08/07/2019, 14:00MCF
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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...
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G. Fogaccia (EPS 2019)08/07/2019, 14:00MCF
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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...
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B. Hong (EPS 2019)08/07/2019, 14:00MCF
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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...
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R. Nazikian (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Porkolab (EPS 2019)08/07/2019, 14:00MCF
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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...
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A. A. Martynov (EPS 2019)08/07/2019, 14:00
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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...
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A. Pandey (EPS 2019)08/07/2019, 14:00MCF
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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...
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M. Rebai (EPS 2019)08/07/2019, 14:00MCF
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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....
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R. Ding (EPS 2019)08/07/2019, 14:00MCF
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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...
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R. Fischer (EPS 2019)08/07/2019, 14:00MCF
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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...
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P. Aleynikov (EPS 2019)08/07/2019, 14:00MCF
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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...
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N. Bosviel (EPS 2019)08/07/2019, 14:00MCF
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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].
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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
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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...
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A.C. Coroado (EPS 2019)08/07/2019, 14:00MCF
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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...
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H. Zhang (EPS 2019)08/07/2019, 14:00BPIF
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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...
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L. Wang (EPS 2019)08/07/2019, 14:00BPIF
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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...
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J. Bonvalet (EPS 2019)08/07/2019, 14:00
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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...
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O. Olkhovskaya (EPS 2019)08/07/2019, 14:00BPIF
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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...
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V.A. Flegentov (EPS 2019)08/07/2019, 14:00BPIF
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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...
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M. Matys (EPS 2019)08/07/2019, 14:00BPIF
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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...
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L. Ji (EPS 2019)08/07/2019, 14:00BPIF
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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...
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J.G. Moreau (EPS 2019)08/07/2019, 14:00BPIF
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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...
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A. Sundström (EPS 2019)08/07/2019, 14:00BPIF
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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...
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M. Watanabe (EPS 2019)08/07/2019, 14:00BPIF
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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...
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T.C. Teter (EPS 2019)08/07/2019, 14:00BPIF
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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,...
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L. Ionel (EPS 2019)08/07/2019, 14:00BPIF
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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...
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S. Chen (EPS 2019)08/07/2019, 14:00BPIF
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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...
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N. Vvedenskii (EPS 2019)08/07/2019, 14:00BPIF
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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...
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W. Zhang (EPS 2019)08/07/2019, 14:00BPIF
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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...
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I. Kourakis (EPS 2019)08/07/2019, 14:00
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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...
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I.I. Metelskii (EPS 2019)08/07/2019, 14:00BPIF
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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...
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M.G. Lobok (EPS 2019)08/07/2019, 14:00BPIF
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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...
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J. Ong (EPS 2019)08/07/2019, 14:00BPIF
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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...
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A.G. Ghazaryan (EPS 2019)08/07/2019, 14:00BPIF
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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...
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S. Krasheninnikov (EPS 2019)08/07/2019, 14:00BPIF
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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...
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P. Raczka (EPS 2019)08/07/2019, 14:00BPIF
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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...
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D.R. Blackman (EPS 2019)08/07/2019, 14:00BPIF
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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...
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Y. Li (EPS 2019)08/07/2019, 14:00BPIF
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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...
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L. Cao (EPS 2019)08/07/2019, 14:00BPIF
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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...
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I.V. Litovko (EPS 2019)08/07/2019, 14:00LTPD
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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...
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L. Kos (EPS 2019)08/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3002.pdf -
M. Timshina (EPS 2019)08/07/2019, 14:00LTPD
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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....
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H. Krüger (EPS 2019)08/07/2019, 14:00LTPD
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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...
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T. Antonova (EPS 2019)08/07/2019, 14:00LTPD
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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...
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S.V. Ryzhkov (EPS 2019)08/07/2019, 14:00LTPD
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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...
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M. Himpel (EPS 2019)08/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3008.pdf -
J. Faltynek (EPS 2019)08/07/2019, 14:00LTPD
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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...
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P.K. Srivastava (EPS 2019)08/07/2019, 14:00LTPD
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http://ocs.ciemat.es/EPS2019ABS/pdf/P1.3010.pdf -
Y. Volkova (EPS 2019)08/07/2019, 14:00LTPD
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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...
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Y. Jung (EPS 2019)08/07/2019, 14:00LTPD
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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...
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K. Nilgumhang (EPS 2019)08/07/2019, 14:00LTPD
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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...
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M. Lee (EPS 2019)08/07/2019, 14:00LTPD
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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...
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G. Arora (EPS 2019)08/07/2019, 14:00LTPD
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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...
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K. Dzhumagulova (EPS 2019)08/07/2019, 14:00LTPD
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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...
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F. Alves Pereira (EPS 2019)08/07/2019, 14:00LTPD
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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...
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A. Melzer (EPS 2019)08/07/2019, 14:00LTPD
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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...
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A. Katorov (EPS 2019)08/07/2019, 14:00LTPD
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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...
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E. Maguid (EPS 2019)08/07/2019, 14:00LTPD
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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...
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A. Georgiev08/07/2019, 14:00
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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...
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D. Kennedy (EPS 2019)08/07/2019, 14:00BSAP
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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...
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T. Natalia (EPS 2019)08/07/2019, 14:00BSAP
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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...
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F. Del Gaudio (EPS 2019)08/07/2019, 14:00BSAP
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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...
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B. Zhang (EPS 2019)08/07/2019, 14:00BSAP
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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...
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M.R. Stoneking (EPS 2019)08/07/2019, 14:00BSAP
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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...
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R. Ekman (EPS 2019)08/07/2019, 14:00BSAP
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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...
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J. Campbell (EPS 2019)08/07/2019, 14:00BSAP
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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...
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S. Nißl (EPS 2019)08/07/2019, 14:00BSAP
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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...
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L. Chen (EPS 2019)08/07/2019, 14:00BSAP
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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...
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M. Guarguaglini (EPS 2019)08/07/2019, 14:00BSAP
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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...
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P. Lageyre (EPS 2019)08/07/2019, 14:00BSAP
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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...
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N. Kenmochi (EPS 2019)08/07/2019, 14:00BSAP
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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...
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E.D. Gospodchikov (EPS 2019)08/07/2019, 14:00BSAP
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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...
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H. Bohlin (EPS 2019)08/07/2019, 14:00BSAP
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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...
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K.M. Schoeffler (EPS 2019)08/07/2019, 14:00BSAP
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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...
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J. Capitaine (EPS 2019)08/07/2019, 14:00BSAP
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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...
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