Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Dusty Plasmas II

P 14.1: Fachvortrag

Mittwoch, 2. März 2016, 11:00–11:25, f102

Dust-Density Wave Analysis as a Diagnostic Tool for Dusty Plasmas — •Benjamin Tadsen, Franko Greiner, and Alexander Piel — IEAP, Christian-Albrechts-Universität, D-24098 Kiel, Germany

In nanodust clouds confined in an rf plasma often self-excited dust-density waves (DDWs) appear. If the parameters wave number and frequency are measured, they can be used as a plasma diagnostic tool. For this purpose we had proposed a method applying a hybrid fluid-kinetic model to experimental data [1]. Although the dispersion of a DDW contains practically all plasma parameters it is possible to reduce the problem to a 2-parameter fit using quasineutrality and dust charging condition as additional constrains. The resulting plasma parameters give an unprecedented insight into the conditions inside a nanodust cloud with high values of dust charge and ion density in the center and lower values at the plasma edge. Additionally, the method reproduces the plasma topology obtained with a Langmuir probe in the dust-free discharge [2].
Supported by DFG via SFB-TR24, project A2.

[1] B. Tadsen et al., Phys. Plasmas 22, 113701 (2015)

[2] B. Tadsen et al., Phys. Plasmas 21, 103704 (2014)