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  as well as theoretical work. However, it was shown using Linear Response(LR) theory  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’ . 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.
 U. Konopka, G. E. Morfill, and L. Ratke, Phys. Rev. Lett. 84, 891 (2000).
 J.-P. Joost, P. Ludwig, H. Kaehlert, C. Arran, and M. Bonitz, Plasma Physics and Controlled Fusion 57, 025004 (2015).
 I. H. Hutchinson, Physics of Plasmas 18, 032111 (2011).