Berlin 2001 – wissenschaftliches Programm
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P: Plasmaphysik
P 10: Theory and Plasma Diagnostic (Poster Session)
P 10.3: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT2
Monte Carlo and Boltzmann Equation Study of the Spatial Electron Relaxation — •F. Sigeneger1, N. A. Dyatko2, and R. Winkler1 — 1Inst. für Niedertemperatur-Plasmaphysik, Greifswald, Germany — 2Inst. for Innovation and Fusion Research, Troitsk, Russia
The complex spatial electron relaxation in non-isothermal plasmas acted upon by electric fields has been comprehensively investigated in the last years by solving the space-dependent Boltzmann equation (BE). To confirm these studies by a completely independent method selected results for a helium plasma are now compared with the corresponding ones obtained by Monte Carlo simulations (MC). Within the latter technique the electrons have been isotropically released at a certain space position z0 with a Gaussian-like energy distribution. Their motion was traced both in upstream and downstream direction until they leave the region of interest in downstream direction. The spatial evolution of the distribution function as well as of the macroscopic quantities has been determined for the time-independent state. The space-dependent Boltzmann equation has been solved by the two term approximation of the velocity distribution function leading to a parabolic problem for the isotropic distribution as a function of the total energy and space coordinate z. To ensure the direct comparability of both approaches the isotropic component determined by the MC simulations at an appropriate position z1>z0 has been applied as boundary value for the BE method. Good agreement of the macroscopic quantities as well as the distribution function has been obtained by both approaches which completely confirms the pronounced spatial relaxation structures of the various quantities.