Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Complex and Dusty Plasmas

P 7.1: Poster

Montag, 13. März 2017, 16:30–18:30, HS Foyer

Nonlinear collisional plasma wakes of small particles — •Sita Sundar, Hanno Kaehlert, Jan-Philip Joost, Patrick Ludwig, and Michael Bonitz — Christian Albrechts Universitaet Kiel Germany - 24098

Dynamical screening and wake effects in complex plasmas have been the subject of many early investigations, including experimental [1] as well as theoretical work. However, it was shown using Linear Response(LR) theory [2] that the characteristic features of the wake potential for non-Maxwellian plasma are qualitatively different from Maxwellian streaming ions. Here, the electrostatic potential of a dust grain in streaming ions in the presence of collision frequency, ν is computed using three-dimensional particle-in-cell(PIC) code ‘COPTIC’ [3]. We compare our numerical results with the wake potential obtained from the LR formalism for Maxwellian and non-Maxwellian cases in linear as well as nonlinear regime. We discuss the physics of distribution function, flux etc. around the grain and present a parametric study of collision frequency vs. wake peak position, peak potential etc. for the non-Maxwellian streaming plasmas.

References:

[1] U. Konopka, G. E. Morfill, and L. Ratke, Phys. Rev. Lett. 84, 891 (2000).

[2] J.-P. Joost, P. Ludwig, H. Kaehlert, C. Arran, and M. Bonitz, Plasma Physics and Controlled Fusion 57, 025004 (2015).

[3] I. H. Hutchinson, Physics of Plasmas 18, 032111 (2011).