Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Poster Session - Dusty Plasmas

P 20.11: Poster

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

Dust grain potential in a flowing magnetized plasma — •Jan-Philip Joost¹, Christopher Arran², Patrick Ludwig¹, Hanno Kählert¹, and Michael Bonitz¹ — ¹ITAP, Christian-Albrechts-Universität zu Kiel — ²Emmanuel College, Cambridge, UK

We extend our previous work [1] on the wake potential in streaming plasmas and include the effect of an external magnetic field parallel to the direction of the ion flow [2]. The dielectric function accounts for a finite ion temperature, ion-neutral collisions, and the external magnetic field. Our recently introduced code ’Kielstream’ is used for an efficient calculation of the dust potential. Increasing the magnetization of the ions, we find that the shape of the potential critically depends on the Mach number M. In the subsonic regime (M<1), a strong magnetization gives rise to a potential distribution that is qualitatively different from the unmagnetized limit while for M>1 the magnetic field effectively suppresses the wake field structure. This work is supported by the DFG via SFB-TR24, projects A9 and A7.

[1] P. Ludwig, W. J. Miloch, H. Kählert, and M. Bonitz, New J. Phys. 14, 053016 (2012)

[2] S. Bhattacharjee and N. Das, Phys. Plasmas 19, 103707 (2012); N. Salimullah et al., Phys. Plasmas 11, 4148 (2004), and references therein