SMuK 2023 – scientific programme
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P: Fachverband Plasmaphysik
P 18: HEPP VII
P 18.1: Talk
Thursday, March 23, 2023, 15:45–16:10, CHE/0091
Electron kinetics in a high-Z plasmoid — •Alistair M. Arnold1, Pavel Aleynikov1, and Boris N. Breizman2 — 1Max-Planck-Institut für Plasmaphysik, Greifswald, Deutschland — 2Institute for Fusion Studies, University of Texas at Austin, Austin, TX, USA
The problem of the electron dynamics on a closed magnetic field line passing through a high-Z plasmoid is considered. The electron kinetic equation is integrated over bounce motion and pitch-angle, reducing the independent variables to a single adiabatic invariant plus time. Integration of the full Landau self-collision operator is carried out exactly, resulting in a nonlinear integro-differential operator in the new invariant. Conservation laws and the H theorem of the integrated self-collision operator are proven. Numerical solutions of the integrated kinetic equation are obtained with a self-consistent quasineutral electric potential, given the initial condition of a cold plasmoid immersed in a hot ambient plasma. The fact that cold electrons are deeply trapped in a potential with a parabolic peak leads to exactly 3/4 the usual rate of collisional heating by the ambient plasma, independent of any other parameters.