Confining and escaping magnetic field lines in Tokamaks: Analysis via symplectic mapIn magnetically confined plasma, it is possible to qualitatively describe the magnetic field configuration via phase spaces of suitable symplectic maps. These phase spaces are of mixed type, where…Matheus S. Palmero, Iberê L. Caldas·Apr 26, 2023SaveLearn
Unsupervised classification of fully kinetic simulations of plasmoid instability using Self-Organizing Maps (SOMs)The growing amount of data produced by simulations and observations of space physics processes encourages the use of methods rooted in Machine Learning for data analysis and physical discovery. We…Sophia Köhne, Elisabetta Boella, Maria Elena Innocenti·Apr 26, 2023SaveLearn
A strategy to identify breakdown location in MITICA test facility: results of high voltage test campaignThe Acceleration Grid Power Supply of the MITICA test facility in Padova (Italy) is currently under commissioning. The power conversion system, the DC generator, and the High Voltage equipment have…Loris Zanotto, Marco Boldrin, Giuseppe Chitarin et al.·Apr 26, 2023SaveLearn
Cross-beam energy transfer in conditions relevant to direct-drive implosions on OMEGAIn cross-beam energy transfer (CBET), the interference of two laser beams ponderomotively drives an ion-acoustic wave that coherently scatters light from one beam into the other. This redirection of…K. L. Nguyen, L. Yin, B. J. Albright et al.·Apr 26, 2023SaveLearn
Effect of triangularity on plasma turbulence and the SOL-width scaling in L-mode diverted tokamak configurationsThe effect of triangularity on tokamak boundary plasma turbulence is investigated by using global, flux-driven, three-dimensional, two-fluid simulations. The simulations show that negative…Kyungtak Lim, Maurizio Giacomin, Paolo Ricci et al.·Apr 25, 2023SaveLearn
Self-consistent gyrokinetic modelling of turbulent and neoclassical tungsten transport in toroidally rotating plasmasThe effect of toroidal rotation on both turbulent and neoclassical transport of tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear…Kyungtak Lim, Xavier Garbet, Yanick Sarazin et al.·Apr 25, 2023SaveLearn
A predictive inline model for nonlinear stimulated Raman scattering in a hohlraum plasmaIn this Letter, we introduce a new inline model for stimulated Raman scattering (SRS), which runs on our radiation hydrodynamics code TROLL. The modeling follows from a simplified version of a…D. Bénisti, O. Morice, C. Rouseaux et al.·Apr 23, 2023SaveLearn
Visualizing Plasmons and Ultrafast Kinetic Instabilities in Laser-Driven Solids using X-ray ScatteringUltra-intense lasers that ionize and accelerate electrons in solids to near the speed of light can lead to kinetic instabilities that alter the laser absorption and subsequent electron transport,…Paweł Ordyna, Carsten Bähtz, Erik Brambrink et al.·Apr 21, 2023SaveLearn
Spatial intermittency of particle distribution in relativistic plasma turbulenceRelativistic magnetically dominated turbulence is an efficient engine for particle acceleration in a collisionless plasma. Ultrarelativistic particles accelerated by interactions with turbulent…Cristian Vega, Stanislav Boldyrev, Vadim Roytershteyn·Apr 21, 2023SaveLearn
Prediction of a roton-type feature in warm dense hydrogenIn a recent Letter [T. Dornheim et al., Phys. Rev. Lett. 121, 255001 (2018)], it was predicted on the basis of ab initio quantum Monte Carlo simulations that, in a uniform…Paul Hamann, Linda Kordts, Alexey Filinov et al.·Apr 21, 2023SaveLearn
Pinch effect of self-generated magnetic fields in the quantum degenerate plasmas on the heating process of the double-cone ignition schemeIn the double-cone ignition scheme, compressed fuels in two head-on cones are ejected to collide, forming a colliding plasma with an isochoric distribution for rapid heating by high flux fast…Y. H. Li, D. Wu, J. Zhang·Apr 21, 2023SaveLearn
Direct laser acceleration in underdense plasmas with multi-PW lasers: a path to high-charge, GeV-class electron bunchesThe direct laser acceleration (DLA) of electrons in underdense plasmas can provide 100s of nC of electrons accelerated to near-GeV energies using currently available lasers. Here we demonstrate the…R. Babjak, L. Willingale, A. Arefiev et al.·Apr 20, 2023SaveLearn
Conditions of structural transition for collisionless electrostatic shockCollisionless shock acceleration, which transfers localized particle energies to non-thermal energetic particles via electromagnetic potential, is ubiquitous in space plasma. We investigate dynamics…Minh Nhat Ly, Takayoshi Sano, Youichi Sakawa et al.·Apr 20, 2023SaveLearn
Self-consistent multi-component simulation of plasma turbulence and neutrals in detached conditionsSimulations of high-density deuterium plasmas in a lower single-null magnetic configuration based on a TCV discharge are presented. We evolve the dynamics of three charged species (electrons, D+…D. Mancini, P. Ricci, N. Vianello et al.·Apr 19, 2023SaveLearn
Plasma density profile reconstruction of a gas cell for Ionization Induced Laser Wakefield AccelerationLaser-driven plasma wakefields can provide hundreds of MeV electron beam in mm-range distances potentially shrinking the dimension of the actual particle accelerators. The plasma density plays a…F. Filippi, L. T. Dickson, M. Backhouse et al.·Apr 19, 2023SaveLearn
Regions without flux surfaces of given class for magnetic fields in toroidal geometryA Converse KAM method for 3D vector fields, establishing regions through which pass no invariant 2-tori transverse to a given direction field, is tested on some helical perturbations of an…Nikos Kallinikos, Robert S. MacKay, David Martinez-del-Rio·Apr 19, 2023SaveLearn
Amplitude modulation and surface wave generation in a complex plasma monolayerThe response of a two-dimensional plasma crystal to an externally imposed initial perturbation has been explored using molecular dynamics (MD) simulations. A two-dimensional (2D) monolayer of…Srimanta Maity, Garima Arora·Apr 19, 2023SaveLearn
Shielded ionisation discharge (SID) probe for spatio-temporal profiling of pulsed molecular beamIn this work we report a shielded ionization discharge (SID) probe which is conceptualized, designed and implemented for measuring temporal and spatial density profiles in a pulsed molecular beam.…Milaan Patel, Jinto Thomas, Hem Chandra Joshi·Apr 19, 2023SaveLearn
MAS: A versatile Landau-fluid eigenvalue code for plasma stability analysis in general geometryWe have developed a new global eigenvalue code, Multiscale Analysis for plasma Stabilities (MAS), for studying plasma problems with wave toroidal mode number n and frequency omega in a broad range of…Jian Bao, Wenlu Zhang, Ding Li et al.·Apr 19, 2023SaveLearn
The role of plasma-atom and molecule interactions on power \& particle balance during detachment on the MAST Upgrade Super-X divertorThis paper shows first quantitative analysis of the detachment processes in the MAST Upgrade Super-X divertor (SXD). We identify an unprecedented impact of plasma-molecular interactions involving…Kevin Verhaegh, Bruce Lipschultz, James Harrison et al.·Apr 18, 2023SaveLearn
Magnetic control of DTT alternative plasma configurationsOne of the main challenges concerning next generation tokamaks (such as DEMO) will be the development of a heat and power exhaust system able to withstand the large loads expected in the divertor…E. Acampora, R. Ambrosino, A. Castaldo et al.·Apr 18, 2023SaveLearn
Consequences of laser transverse imperfections on laser wakefield acceleration at the Apollon facilityWith the currently available laser powers, it is possible to reach the blowout regime in the Laser WakeField Acceleration (LWFA) where the electrons are completely expelled off-axis behind the laser…Imene Zemzemi, Arnaud Beck, Arnd Specka·Apr 18, 2023SaveLearn
Microtearding mode study in NSTX using machine learning enhanced reduced modelThis article presents a survey of NSTX cases to study the microtearing mode (MTM) stabilities using the newly developed global reduced model for Slab-Like Microtearing modes (SLiM). A trained neutral…Max T. Curie, Joel Larakers, Jason Parisi et al.·Apr 18, 2023SaveLearn
Integration studies of RF solid-state generators in the electrical system of NBTF experiments and ITER HNBSPIDER operation, started in 2018, pointed out performance-limiting issues caused by the technology employed in RF generators, based on tetrode free-running oscillators. One of these limits, namely…R. Casagrande, A. Maistrello, M. Recchia et al.·Apr 18, 2023SaveLearn
Analysis of the ECH effect on the EPM/AEs stability in Heliotron J plasma using a Landau closure modelThe aim of the present study is to analyze the effect of the electron cyclotron heating (ECH) on the linear stability of Alfven Eigenmodes (AE) and energetic particle modes (EPM) triggered by…J. Varela, K. Nagasaki, S. Kobayashi et al.·Apr 18, 2023SaveLearn