Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Complex and Dusty Plasmas

P 7.9: Poster

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

Simulation of ion wake effects in dusty plasmas — •Alexander Piel — IEAP, Kiel University

The focussing of supersonic ion flows by negatively charged dust particles and the associated accumulation of positive charge in the wake of the particle is a well known phenomenon [1]. In experiments, attractive forces between dust particles are often attributed to the attraction by the wake charge. In this contribution, results from a fast molecular dynamics code are presented that analyze the interparticle forces in detail. It is shown that net attractive forces are only found when the second particle is located transverse to the direction of the flow. The force is greatest in the plane of the maximum of the wake potential. Contrariwise, two flow-aligned particles only show repulsive forces. Further, the ion charge collection in two-particle systems is studied. The results are discussed w.r.t. the asymmetric interaction observed in resonance experiments [2].

These investigations were funded by DFG TR-24 project A2.

[1] D. Block et al, Contrib. Plasma Phys. 52, 804 (2012) [2] H. Jung et al, Phys. Plasmas 22, 053702 (2015)

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