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The numerical simulation of impurity transport in Tokamak edge plasma is a fundamental tool for the understanding of both global and detailed problems encountered in edge plasma physics. Contrary to the previously applied simulation codes, this work is based on calculations directly derived from the theoretical background. Starting-point are the kinetic equations for a completely ionized plasma in which the loaded particles interact through Coulomb forces. The impurity ions have been studied in the test particle approximation and the problem reduced to the solution of one linear kinetic equation. Assumptions regarding background plasma and electromagnetic fields have been made which allow to derive a kinetic equation of the Fokker-Planck type both in plasma coordinates and drift-kinetic variables. An exact Monte Carlo method has been suggested for the numerical solution of the kinetic equation of the Fokker-Planck type. Examples for similar stochastic processes that allow an analytical solution demonstrate the capability and the correctness of the method. The Monte Carlo algorithm for pure diffusion has been extended by particle transformation processes such as ionization and recombination. First practical calculations for TEXTOR plasma have been implemented and discussed.

Additional information

Authors: REISER D, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Paper presented: DE (1996) 55pp., free of charge
Availability: Available from Forschungszentrum Jülich GmbH, Zentralbibliothek, D-52425 Jülich (DE)
ISBN: ISSN 0944-2952
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