Ring momentum distributions as a general feature of Vlasov dynamics in the synchrotron dominated regimeWe study how radiation reaction leads plasmas initially in kinetic equilibrium to develop features in momentum space, such as anisotropies and population inversion, resulting in a ring-shaped…Pablo. J. Bilbao, Robert J. Ewart, Francisco Assunçao et al.·Apr 17, 2024SaveLearn
A "lighthouse" laser-driven staged proton accelerator allowing for ultrafast angular and spectral controlCompact laser-plasma acceleration of fast ions has made great strides since its discovery over two decades ago, resulting in the current generation of high-energy (≥ 100\, MeV) ultracold…Vojtěch Horný, Konstantin Burdonov, Alice Fazzini et al.·Apr 17, 2024SaveLearn
Quantification of locked mode instability triggered by a change in confinementThis work presents the first analysis of the disruptive locked mode (LM) triggered by the dynamics of a confinement change. It shows that, under certain conditions, the LM threshold during the…M. Peterka, J. Seidl, T. Markovic et al.·Apr 17, 2024SaveLearn
A dispersion function for the regularized kappa distribution functionIn this work we define the plasma dispersion function for a suprathermal plasma described with a regularized kappa distribution. As is known from Maxwellian as well as (standard) kappa plasmas, the…Rudi Gaelzer, Horst Fichtner, Klaus Scherer·Apr 16, 2024SaveLearn
Expulsion of runaway electrons using ECRH in the TCV tokamakRunaway electrons (REs) are a concern for tokamak fusion reactors from discharge startup to termination. A sudden localized loss of a multi-megaampere RE beam can inflict severe damage to the first…J. Decker, M. Hoppe, U. Sheikh et al.·Apr 15, 2024SaveLearn
Calculating radio emissions of positive streamer phenomena using 3D simulationsWe study radio emissions from positive streamers in air using 3D simulations, from which the radiated electric field is computed by solving Jefimenko's equations. The simulations are performed at…Hemaditya Malla, Brian M. Hare, Steven Cummer et al.·Apr 15, 2024SaveLearn
Electric field effects during disruptionsTokamak disruptions are associated with breaking magnetic surfaces, which makes magnetic field lines chaotic in large regions of the plasma. The enforcement of quasi-neutrality in a region of chaotic…Allen H Boozer·Apr 15, 2024SaveLearn
Influence of the density gradient on turbulent heat transport at ion-scales: an inter-machine study with the gyrokinetic code stellaEfficient control of turbulent heat transport is crucial for magnetic confinement fusion reactors. This work discusses the complex interplay between density gradients and micro-instabilities,…H Thienpondt, JM García-Regaña, I Calvo et al.·Apr 15, 2024SaveLearn
The effects of finite electron inertia on helicity-barrier-mediated turbulenceUnderstanding the partitioning of turbulent energy between ions and electrons in weakly collisional plasmas is crucial for the accurate interpretation of observations and modelling of various…T. Adkins, R. Meyrand, J. Squire·Apr 14, 2024SaveLearn
Inertial range of magnetorotational turbulenceAccretion disks around compact stars are formed due to turbulence driven by magnetorotational instability. Despite over thirty years of numerous computational studies on magnetorotational turbulence,…Yohei Kawazura, Shigeo S. Kimura·Apr 14, 2024SaveLearn
Convolutional hybrid-PIC modeling of non-neutral plasmasNon-neutral plasmas can excite many nonlinear plasma phenomena, e.g., collisionless shocks, sheath layers, solitons, and plasma plumes. It is a fundamental issue in fields such as astrophysics, space…Jin-Long Jiao·Apr 13, 2024SaveLearn
Adaptive Anomaly Detection Disruption Prediction Starting from First Discharge on TokamakPlasma disruption presents a significant challenge in tokamak fusion, where it can cause severe damage and economic losses. Current disruption predictors mainly rely on data-driven methods, requiring…Xinkun Ai·Apr 12, 2024SaveLearn
Establishing Criteria for the Transition from Kinetic to Fluid Modeling in Hollow Cathode AnalysisIn this study, we conduct 2D3V Particle-In-Cell simulations of hollow cathodes, encompassing both the channel and plume region, with an emphasis on plasma switch applications. The plasma in the…Willca Villafana, Andrew T. Powis, Sarveshwar Sharma et al.·Apr 12, 2024SaveLearn
Laser-stimulated photodetachment of electrons from the negatively charged dielectric substratesIt is shown experimentally that the photodetachment yield of surplus electrons created by plasma-induced charging of non-conductive surfaces of dielectric materials depends on the initial surface…Y. Ussenov, M. N. Shneider, S. Yatom et al.·Apr 12, 2024SaveLearn
A fully implicit, asymptotic-preserving, semi-Lagrangian algorithm for the time dependent anisotropic heat transport equationIn this paper, we extend the operator-split asymptotic-preserving, semi-Lagrangian algorithm for time dependent anisotropic heat transport equation proposed in [Chacón et al., JCP, 272, 719-746,…O. Koshkarov, L. Chacon·Apr 12, 2024SaveLearn
Time-resolved investigations of a glow mode impulse dielectric barrier discharge in pure ammonia gas by means of E-FISH diagnosticTime-resolved electric field strength measurements have been performed, using an electric-field induced second harmonic (E-FISH) diagnostic, in a nanosecond glow discharge of an impulse dielectric…Ronny Jean-Marie-Desiree, Aymane Najah, Cédric Noël et al.·Apr 12, 2024SaveLearn
Role of nonlocal heat transport on the laser ablative Rayleigh-Taylor instabilityAblative Rayleigh-Taylor instability (ARTI) and nonlocal heat transport are the critical problems in laser-driven inertial confinement fusion, while their coupling with each other is not completely…Z. H. Chen, X. H. Yang, G. B. Zhang et al.·Apr 12, 2024SaveLearn
Efficiency of dynamos from an autonomous generation of chiral asymmetryAt high energies, the dynamics of a plasma with charged fermions can be described in terms of chiral magnetohydrodynamics. Using direct numerical simulations, we demonstrate that chiral magnetic…Jennifer Schober, Igor Rogachevskii, Axel Brandenburg·Apr 11, 2024SaveLearn
Realizing Laser-driven Deuteron Acceleration with Low Energy Spread via In-situ D2O-deposited TargetGeneration of quasi-monoenergetic ion pulse by laser-driven acceleration is one of the hot topics in laser plasma physics. In this study, we present a new method for the In-situ deposition…Tianyun Wei, Yasunobu Arikawa, Seyed Reza Mirfayzi et al.·Apr 11, 2024SaveLearn
Theoretical and Global Simulation Analysis of Collisional MicrotearingThis study delves into Microtearing Modes (MTMs) in tokamak plasmas, employing advanced simulations within the BOUT++ framework. The research, centering on collisional MTMs influenced by the…Kaixuan Fan, Xue-Qiao Xu, Ben Zhu et al.·Apr 11, 2024SaveLearn
Optical and Transport Properties of Plasma Mixtures from Ab Initio Molecular DynamicsPredicting the charged particle transport properties of warm dense matter / hot dense plasma mixtures is a challenge for analytical models. High accuracy ab initio methods are more computationally…Alexander J. White, Galen T. Craven, Vidushi Sharma et al.·Apr 11, 2024SaveLearn
X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition FacilityWe present results from X-ray imaging of high-aspect-ratio magnetic reconnection experiments driven at the National Ignition Facility. Two parallel, self-magnetized, elongated laser-driven plumes are…V. Valenzuela-Villaseca, J. M. Molina, D. B. Schaeffer et al.·Apr 11, 2024SaveLearn
I-mode Plasma Confinement Improvement by Real-time Lithium Injection and its Classification on EAST TokamakI-mode is a promising regime for future fusion reactors due to the high energy confinement and the moderate particle confinement. However, the effect of lithium, which has been widely applied for…X. M. Zhong, X. L. Zou, A. D. Liu et al.·Apr 11, 2024SaveLearn
Achieving High Polarization of Photons Emitted by Unpolarized Electrons in Ultrastrong Laser FieldsNonlinear Compton scattering driven by ultraintense lasers presents a promising avenue for enhancing the photon energy, brilliance, and setup compactness of γ-ray sources. However, a significant…Xian-Zhang Wu, Yan-Fei Li, Yu-Tong Li·Apr 10, 2024SaveLearn
Machine learning assisted optical diagnostics on a cylindrical atmospheric pressure surface dielectric barrier dischargeThe present study explores combining machine learning (ML) algorithms with standard optical diagnostics (such as time-integrated emission spectroscopy and imaging) to accurately predict operating…Dimitrios Stefas, Konstantinos Giotis, Laurent Invernizzi et al.·Apr 10, 2024SaveLearn