Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Complex and Dusty Plasmas

P 7.5: Poster

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

Characteristics of the charge density distribution around a test charge in streaming plasmas — •Zhandos Moldabekov1,2, Patrick Ludwig1, Sita Sunda1, Ingmar Schnell1, and Michael Bonitz11Christian-Albrechts-Universität zu Kiel, Germany — 2Al-Farabi Kazakh National University, Almaty

Interaction between dust particles in complex plasmas can significantly deviate from the simple Yukawa (Debye) type potential due to streaming of plasma particles. Recent progress on this problem has been achieved for both unmagnetized and magnetized plasmas. In the unmagnetized case, the deviation of the dust charge potential from the equilibrium result can be understood by the ion focusing effect of the negatively charged dust particle. Particularly, this is the case for the experiments on study of the complex plasma properties in the different types of gas discharges. Therefore, the development of the physical picture of the dust particles dynamics in such stationary nonequilibrium plasma requires the careful evaluation of the charge distribution of the focused ion cloud at different regimes of the plasma parameters. We take the ion acceleration by an external electric field explicitly into account, which leads to a non-Maxwellian velocity distribution. The results are compared to PIC and fluid simulations. Further attention is devoted to the construction of the analytical model within a multipole expansion approximation for the description of the lateral grain-grain interaction, i.e. perpendicular to the direction of the ion flow.

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