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A. Marinoni (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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E. Panontin (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Podolnik (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A.S. Prishvitcyn (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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3382. P4.1005 Application of Laplacian Eigen Functions for the tomographic reconstruction of tokamakS. Purohit (EPS 2019)7/11/19, 2:00 PMMCF
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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....
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P.A. Sdvizhenskii (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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C. Shen (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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P. Svihra (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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N. Teplova (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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M. Tunkl (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Cremona (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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D. Cruz Zabala (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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K.D. Lawson (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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T. Nishizawa (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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N. Offeddu (EPS 2019)7/11/19, 2:00 PMMCF
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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)...
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A. Perek (EPS 2019)7/11/19, 2:00 PMMCF
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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
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interplay between these processes, a novel, real-time capable, visible multispectral imaging system (MANTIS [1]) was installed on the TCV... -
S. Schmuck (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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3397. P4.1020 The study of L-mode filament dynamics using synthetic and experimental BES diagnosticsO. Asztalos (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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M. Vecsei (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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S. Vincent (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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Z. Yang (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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C. Zhou (EPS 2019)7/11/19, 2:00 PMMCF
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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
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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)7/11/19, 2:00 PMMCF
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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...
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P. Sirén (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A.A. Teplukhina (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A.N. Karpushov (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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K. Tretiak (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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R. Coelho (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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O. Kovanda (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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L. Kripner (EPS 2019)7/11/19, 2:00 PMMCF
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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,...
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O. Linder (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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L. Liu (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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P. Maget (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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W. Mao (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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L. Marrelli (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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N. Marusov (EPS 2019)7/11/19, 2:00 PMMCF
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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
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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)7/11/19, 2:00 PMMCF
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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...
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S. Medvedev (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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M. Nagata (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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M. Okabayashi (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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B. Park (EPS 2019)7/11/19, 2:00 PMMCF
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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,...
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G. Pautasso (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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V.V. Plyusnin (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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F. Porcelli (EPS 2019)7/11/19, 2:00 PMMCF
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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.
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We present the first step in the development of an... -
V.D. Pustovitov (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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Y. Shibata (EPS 2019)7/11/19, 2:00 PMMCF
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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....
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R.D. Nem (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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Y. Suzuki (EPS 2019)7/11/19, 2:00 PMMCF
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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)...
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L. Vela (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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V. Scalera (EPS 2019)7/11/19, 2:00 PMMCF
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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
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loads, particle loads,... -
C. Wahlberg (EPS 2019)7/11/19, 2:00 PMMCF
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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,...
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V. Weinzettl (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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V. Yanovskiy (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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3433. P4.1057 Observation of poloidally asymmetric transport during sawtooth crash on J-TEXT tokamakY. Zhou (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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E. Alessi (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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W. Kernbichler (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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G.F. Subbotin (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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P. Piovesan (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A.V. Sudnikov (EPS 2019)7/11/19, 2:00 PMMCF
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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]....
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V.I. Batkin (EPS 2019)7/11/19, 2:00 PMMCF
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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,...
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M.G. Senstius (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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C. Ribeiro (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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E. Saad (EPS 2019)7/11/19, 2:00 PMMCF
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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)...
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C. Geng (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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R. Gatto (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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E.I. Soldatkina (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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R. Dendy (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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M. Farnik (EPS 2019)7/11/19, 2:00 PMMCF
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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.
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Heating of plasma in COMPASS-U... -
N. Ferron (EPS 2019)7/11/19, 2:00 PMMCF
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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....
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L. Figini (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Fukuyama (EPS 2019)7/11/19, 2:00 PMMCF
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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.
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The dielectric tensor in a hot plasma has been... -
S. Geng (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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E.Z. Gusakov (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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T. Jonsson (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Köhn (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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I.L. Arbina (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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S.I. Lashkul (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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B. Ljungberg (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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T. Maekawa (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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V.B. Minaev (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Nicolai (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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G. Troshin (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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Y. Nozawa (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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P.B. Shchegolev (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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C. Sozzi (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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J.C. Wright (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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L. Calacci (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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J. Chung (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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N.J. Fisch (EPS 2019)7/11/19, 2:00 PMMCF
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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....
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M. Hron (EPS 2019)7/11/19, 2:00 PMMCF
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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,...
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Y.V. Mitrishkin (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Pajares (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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J.A. Reusch (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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N.V. Sakharov (EPS 2019)7/11/19, 2:00 PMMCF
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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 =...
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D. Voltolina (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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A. Mariani (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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S. Murakami (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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H. Yamada (EPS 2019)7/11/19, 2:00 PMMCF
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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...
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B. Patel (EPS 2019)7/11/19, 2:00 PMMCF
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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....
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D. Ho (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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M. Ruijter (EPS 2019)7/11/19, 2:00 PM
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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...
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Y. Chen (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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Z. Chen (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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J. Dostal7/11/19, 2:00 PMBPIF
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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...
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J.L. Milovich (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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X. Xie (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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3487. P4.2009 Interactions of crossing laser pulses in plasma with applications to auxiliary heatingB.T. Spiers (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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A. Maffini (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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N. Fahrenkamp (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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K. Lotov (EPS 2019)7/11/19, 2:00 PMBPIF
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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....
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K. Jiang (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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M. Karmakar (EPS 2019)7/11/19, 2:00 PMBPIF
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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....
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Y. Li (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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S. Marini (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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O. Vais (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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B.F. Svedung Wettervik (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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D.E. Tatomirescu (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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X. Li (EPS 2019)7/11/19, 2:00 PMBPIF
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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.
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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)7/11/19, 2:00 PMBPIF
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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...
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K. Mima (EPS 2019)7/11/19, 2:00 PMBPIF
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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.
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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)7/11/19, 2:00 PMBPIF
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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...
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D. Toporkov (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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H. Kallala (EPS 2019)7/11/19, 2:00 PMBPIF
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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...
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L.A. Gizzi7/11/19, 2:00 PMBPIF
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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...
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S. Maity (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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A. Rokhmanenkov (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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A. Fredriksen (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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T. Gyergyek (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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A. Scurtu (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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A. D'Angola (EPS 2019)7/11/19, 2:00 PMLTPD
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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....
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J. Oelmann (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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C. Piferi (EPS 2019)7/11/19, 2:00 PM
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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...
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H. Kawazoe (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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E.A. Shershunova (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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D. Rauner (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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C. Arnas (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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R. Friedl (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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M. Hénault (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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I. Uzun-Kaymak (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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A. Laricchiuta (EPS 2019)7/11/19, 2:00 PMLTPD
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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,...
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K. Hassouni (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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V. Borzosekov (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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C.T. Teodorescu-Soare (EPS 2019)7/11/19, 2:00 PMLTPD
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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,...
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H. Nakamura (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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S. Pramanik (EPS 2019)7/11/19, 2:00 PMLTPD
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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...
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C. Carra7/11/19, 2:00 PM
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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...
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Y. Abe7/11/19, 2:00 PM
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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 ...
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R. Pakter (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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I. Abramov (EPS 2019)7/11/19, 2:00 PMBSAP
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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]....
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V.V. Mykhaylenko (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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N. Plihon (EPS 2019)7/11/19, 2:00 PMBSAP
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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].
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We report here a detailed experimental investigation of the plasma potential control using... -
C.B. Smiet (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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C. Ryu (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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N. Shukla (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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R. Mukherjee (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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A. Theodorsen (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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H. Yan (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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N. Morshedian (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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F. Cruz (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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M.T. Whyte (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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A.A. Nechaev (EPS 2019)7/11/19, 2:00 PMBSAP
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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...
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D. Burgess7/11/19, 2:00 PMBSAP
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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...
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