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P: Fachverband Plasmaphysik

P 5: Theory/Modelling I

P 5.6: Vortrag

Dienstag, 9. März 2010, 15:40–15:55, B 302

Tree-Code Based Mesh-Free Simulation of a Gas-Puff — •Benjamin Berberich¹, Detlev Reiter¹, and Paul Gibbon² — ¹IEF-4, Forschungszentrum Jülich — ²JSC, Forschungszentrum Jülich

Mesh free simulation techniques such as the Fast Multipole Method or so called tree algorithms have proven to be highly efficient tools in many fields of modern computational science. Among these codes the 3-dimensional, fully kinetic electrostatic Tree-Code PEPC-B has been used successfully for particle simulation in the framework of Laser-Plasma interaction. In the present work we show the principle ideas behind such methods and examples. Also results of new developments to the code are presented to make the method applicable to magnetic fusion plasma physics with emphasis on Plasma Surface Interaction topics. In particular implementation of an external B-field, as well as an additional hybrid particle-fluid collision term are discussed and verified. As a first application to a magnetic fusion problem we present results of a combined EIRENE PEPC-B simulation of a gas-puff experiment in the TEXTOR tokamak (FZ Juelich), and the resulting effects of the self-consistent E-field due to strong localized ionization. The influence of this E-field to expand the ionization cloud is investigated and compared to earlier semi-analytical predictions[1].

[1] M.Z.~Tokar; Plasma Behaviour near strong Sources of Impurities; Contrib. Plasma Phys. 36 (1996) 2/3, 250-254