Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session- Dusty Plasmas

P 10.7: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

On the wake structure in a flowing magnetized plasma — •Sita Sundar, Hanno Kaehlert, Patrick Ludwig, and Michael Bonitz — Christian-Albrechts-Universität Kiel

Dynamical screening and wake effects in complex plasmas have been the subject of many early investigations, including experimental[1] as well as theoretical work[2]. However, it was shown using Linear Response(LR) theory [3] that the characteristic features of the wake potential are qualitatively different in the presence of magnetic field. Here, the electrostatic potential of a dust grain in a flowing magnetized plasma is computed using the 3D parallel PIC Code ‘COPTIC’[4]. In addition to the magnetic field, the system takes into account the effect of ion-neutral collisions. We compare our numerical results with the wake potential obtained from the LR formalism for magnetized as well as unmagnetized cases. We discuss the physics of distribution function, flux etc. around the grain and present a parametric study of magnetization vs. wake peak position, peak potential etc. for the magnetized streaming plasmas.

References

[1] U Konopka, G E Morfill and L Ratke Phys. Rev. Lett. 84, 891-4 (2000).

[2] M Lampe, G Joyce, G Ganguli and V Gavrishchaka Phys. Plasmas 7, 3851-61 (2000).

[3] J-P Joost, P Ludwig, H Kaehlert, C Arran and M Bonitz Plasma Phys. Control. Fusion 57, 0125004 (2015).

[4] I H Hutchinson Phys. Plasmas 18, 032111 (2011).