Kinetic theory of particle-in-cell simulation plasma and the ensemble averaging techniqueWe derive the kinetic theory of fluctuations in physically and numerically stable particle-in-cell (PIC) simulations of electrostatic plasmas. The starting point is the single-time correlations at…Michael Touati, Romain Codur, Frank Tsung et al.·Aug 12, 2022SaveLearn
Investigating particle acceleration dynamics in interpenetrating magnetized collisionless super-critical shocksColliding collisionless shocks appear in a great variety of astrophysical phenomena and are thought to be possible sources of particle acceleration in the Universe. We have previously investigated…W. Yao, A. Fazzini, S. N. Chen et al.·Aug 12, 2022SaveLearn
Ultra Long Turbulent Eddies, Magnetic Topology, and the Triggering of Internal Transport Barriers in TokamaksLocal nonlinear gyrokinetic simulations of tokamak plasmas demonstrate that turbulent eddies can extend along magnetic field lines for hundreds of poloidal turns when the magnetic shear is very…A. Volčokas, J. Ball, S. Brunner·Aug 12, 2022SaveLearn
Coarse-grained gyrokinetics for the critical ion temperature gradient in stellaratorsWe present a modified gyrokinetic theory to predict the critical gradient that determines the linear onset of the ion temperature gradient (ITG) mode in stellarator plasmas. A coarse-graining…G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos·Aug 11, 2022SaveLearn
Microstability of β 1 tokamak equilibriaHigh-power-density tokamaks offer a potential solution to design cost-effective fusion devices. One way to achieve high power density is to operate at a high β value (the ratio of thermal to…Rahul Gaur, Ian G. Abel, David Dickinson et al.·Aug 10, 2022SaveLearn
Multidisciplinary benchmarks of a conservative spectral solver for the nonlinear Boltzmann equationThe Boltzmann equation describes the evolution of the phase-space probability distribution of classical particles under binary collisions. Approximations to it underlie the basis for several…George J. Wilkie, Torsten Keßler, Sergej Rjasanow·Aug 10, 2022SaveLearn
Development of high-frequency magnetic probe for plasma diagnostics of XuanLong-50A high-frequency magnetic probe has been designed and developed on XuanLong-50 (EXL-50) spherical torus to measure high-frequency magnetic field fluctuations caused by energetic ions and electrons in…Mingyuan Wang, Xiuchun Lun, Xiaokun Bo et al.·Aug 9, 2022SaveLearn
Simultaneous measurements of unstable and stable Alfvén Eigenmodes in JETIn this paper, we report the novel experimental observation of both unstable and stable Toroidicity-induced Alfvén Eigenmodes (TAEs) measured simultaneously in a JET tokamak plasma. The…R. A. Tinguely, J. Gonzalez-Martin, P. G. Puglia et al.·Aug 9, 2022SaveLearn
The structure of 3D collisional magnetized bow shocks in pulsed-power-driven plasma flowWe investigate 3D bow shocks in a highly collisional magnetized aluminum plasma, generated during the ablation phase of an exploding wire array on the MAGPIE facility (1.4 MA, 240 ns). Ablation of…Rishabh Datta, Danny R. Russell, Iek Tang et al.·Aug 9, 2022SaveLearn
Fueling limits in a cylindrical viscosity-limited reactorRecently, a method to achieve a "natural hot-ion mode" was suggested, by utilizing ion viscous heating in a rotating plasma with a fixed boundary. We explore the steady-state solution to the…Tal Rubin, Elijah J. Kolmes, Ian E. Ochs et al.·Aug 7, 2022SaveLearn
Filamentary plasma eruptions and the heating and acceleration of electronsWe present test-particle simulations of electrons during a nonlinear MHD simulation of a type-I edge localized mode (ELM) to explore the effect of an eruptive plasma filament on the kinetic level.…Heinz Isliker, Andres Cathey, Matthias Hoelzl et al.·Aug 5, 2022SaveLearn
Wall cratering upon high velocity normal dust impactDust-wall high speed impacts, triggered by the termination of runaway electrons on plasma facing components, constitute a source of erosion. Normal high velocity mechanical impacts of tungsten dust…Panagiotis Tolias, Marco De Angeli, Dario Ripamonti et al.·Aug 4, 2022SaveLearn
Required toroidal confinement for fusion and omnigeneityDeuterium-tritium (DT) burning requires a long energy confinement times compared to collision times, so the particle distribution functions must approximate local-Maxwellians. Non-equilibrium…Allen H Boozer·Aug 4, 2022SaveLearn
Local Diagnostics of the Density of Neutral Atoms in Plasma by Stimulated Rotation of Polarization PlaneThe polarization plane stimulated rotation angle of probe signal in the intense laser field in plasma is calculated. The estimates of the residual gas local density in a cesium plasma based on the…Krzysztof Dzierzega, Michal Hnatic, Koryun B. Oganesyan et al.·Aug 4, 2022SaveLearn
Square lattice formation in a monodisperse complex plasmaWe present the first observations of a square lattice formation in a monodisperse complex plasma system - a configurational transition phenomenon that has long been an experimental challenge in the…Swarnima Sing, Pintu Bandyopadhyay, Krishan Kumar et al.·Aug 4, 2022SaveLearn
Energetic particle loss mechanisms in reactor-scale equilibria close to quasisymmetryCollisionless physics primarily determines the transport of fusion-born alpha particles in 3D equilibria. Several transport mechanisms have been implicated in stellarator configurations, including…E. J. Paul, A. Bhattacharjee, M. Landreman et al.·Aug 3, 2022SaveLearn
Effect of the electronic pressure on the energy and magnetic moment of charged test particles in turbulent electromagnetic fieldsIn this work we perform direct numerical simulations of three-dimensional magnetohydrodynamics with a background magnetic field, representing solar wind plasma, and introduce test particles to…B. Balzarini, F. Pugliese, P. Dmitruk·Aug 3, 2022SaveLearn
A phase-shift-periodic parallel boundary condition for low-magnetic-shear scenariosWe formulate a generalized periodic boundary condition as a limit of the standard twist-and-shift parallel boundary condition that is suitable for simulations of plasmas with low magnetic shear. This…D. A. St-Onge, M. Barnes, F. I. Parra·Aug 3, 2022SaveLearn
Development and application of a hybrid MHD-kinetic model in JOREKEnergetic particle (EP) driven instabilities will be of strongly increased relevance in future burning plasmas as the EP pressure will be very large compared to the thermal plasma. Understanding the…T. J. Bogaarts, M. Hoelzl, G. T. A. Huijsmans et al.·Aug 3, 2022SaveLearn
Energy transport during 3D small-scale reconnection driven by anisotropic plasma turbulenceEnergy dissipation in collisionless plasmas is a longstanding fundamental physics problem. Although it is well known that magnetic reconnection and turbulence are coupled and transport energy from…Jeffersson A. Agudelo Rueda, Daniel Verscharen, Robert T. Wicks et al.·Aug 3, 2022SaveLearn
Runaway dynamics in reactor-scale spherical tokamak disruptionsUnderstanding generation and mitigation of runaway electrons in disruptions is important for the safe operation of future tokamaks. In this paper we investigate runaway dynamics in reactor-scale…E. Berger, I. Pusztai, S. L. Newton et al.·Aug 3, 2022SaveLearn
Bayesian approach for validation of runaway electron simulationsPlasma-terminating disruptions in future fusion reactors may result in conversion of the initial current to a relativistic runaway electron beam. Validated predictive tools are required to optimize…Aaro Järvinen, Tünde Fülöp, Eero Hirvijoki et al.·Aug 3, 2022SaveLearn
Gyrokinetic simulations of plasma turbulence in a Z-pinch using a moment based approach and advanced collision operatorsThe first nonlinear gyrokinetic simulations obtained using a moment approach based on the Hermite-Laguerre decomposition of the distribution function are presented, implementing advanced models for…A. C. D. Hoffmann, B. J. Frei, P. Ricci·Aug 2, 2022SaveLearn
Exact and paraxial Airy propagation of relativistic electron plasma wavepacketsThe different forms of propagation of relativistic electron plasma wavepackets in terms of Airy functions are studied. It is shown that exact solutions can be constructed showing accelerated…Maricarmen A. Winkler, Camilo Vásquez-Wilson, Felipe A. Asenjo·Aug 2, 2022SaveLearn
Detection of poloidal magnetic flux emission from a plasma focusDirect experimental evidence for the existence of axial magnetic field both in the radial implosion phase and the pinch phase of a plasma focus has raised many questions of fundamental importance.…S K H Auluck·Aug 2, 2022SaveLearn