Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Dusty Plasmas II

P 17.6: Talk

Wednesday, March 15, 2017, 10:10–10:25, HS 2010

Characterization of Dusty Plasmas in a Magnetic Field — •Benjamin Tadsen, Franko Greiner, and Alexander Piel — Institute of Experimental and Applied Physics, Kiel University, Germany

If a dusty plasma is exposed to a magnetic field, it’s topological structure changes. As the electrons get magnetized, the plasma is confined with a cylindrical shape [1] due to the low cross-field mobility of the electrons. In such a situation a variety of instabilities like dust-density waves (DDWs) and plasma filamentation can be observed. In this contribution, an experimental setup is presented that is used to characterize the dust cloud of submicron particles in an rf plasma. The particle size is determined using Mie-scattering of polarized light and the dust particle density is calculated from extinction images of the dust cloud with an Abel inversion algorithm. The DDWs are observed at a frame rate well above the dust plasma frequency. Information about ion density and dust charge can be extracted from the data [2]. Using these diagnostics, the transition from an unmagnetized to a magnetized plasma will be examined.
Supported by DFG via SFB-TR24, project A2.

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

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