Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Poster Session - Dusty Plasmas

P 20.6: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

Dielectric function of a partially ionized plasma in parallel electric and magnetic fields — •Hanno Kählert, Patrick Ludwig, and Michael Bonitz — ITAP, Christian-Albrechts-Universität zu Kiel

The longitudinal dielectric function of a plasma is an important quantity that determines, e.g., its eigenmodes or how efficiently it shields the potential of an embedded dust particle. Here, we compute the dielectric function for a plasma that is subject to parallel electric and magnetic fields. This situation is common for the sheath region in rf discharges, where the electric field gives rise to a finite ion flow velocity. Strong magnetic fields have now become available in several experiments [1], which is why a theoretical understanding of their effect on the plasma dynamics is highly desirable. Our derivation of the dielectric function is based on a kinetic approach, where ion-neutral collisions are treated with a BGK collision term [2]. Possible applications are discussed.This work is supported by the DFG via SFB-TR24, projects A7 and A9.

[1] M. Schwabe, U. Konopka, P. Bandyopadhyay, and G. E. Morfill, Phys. Rev. Lett. 106, 215004 (2011); J. Carstensen , F. Greiner, and A. Piel, Phys. Rev. Lett. 109, 135001 (2012)

[2] A. V. Ivlev, S. K. Zhdanov, S. A. Khrapak, and G. E. Morfill, Phys. Rev. E 71, 016405 (2005)