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P: Fachverband Plasmaphysik

P 15: Poster: Laserplasmen und Quantenplasmen

P 15.1: Poster

Thursday, February 28, 2013, 14:00–16:00, Poster EG

Dust grain charging in the wake of other grains — •Dietmar Block¹ and Wojciech Miloch² — ¹IEAP der CAU Kiel, Leibnizstr. 19, 24118 Kiel, Germany — ²Dept. of Physics, University Olso, N-0316 Oslo, Norway

Recent experiments have shown that two aligned grains in a plasma flow are charged differently. In this contribution, we address the problem of the charge distribution in two- and multiple grain arrangements in sonic and supersonic collisionless plasma flows by means of self-consistent numerical particle-in-cell (PIC) simulations. First, the charging of a system of two gains is studied for a range of flow velocities and intergrain distances. Second, a third aligned grain is added and its charging process is investigated in detail. In a third step, we investigate the charging of a grain below a layer of grains. Finally a cluster of 15 grains is studied. Thus, our simulations systematically investigate the influence of the local neighborhood on the charging processes for situations which differ in complexity.