Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session 3

P 16.31: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Dust Clusters and Dust-Density Waves in Magnetized Dusty Plasmas — •Andre Melzer, Harald Krüger, and Stefan Schütt — Institute of Physics, University Greifswald

The effects of magnetic fields on dusty plasmas have attracted high interest, recently, due to the availability of superconductive magnets for such experiments. Dusty plasmas consist of charged dust particles immersed in a discharge plasma with electrons, ions and neutrals. We now have performed experiments on dusty plasmas under strong magnetic fields.

On the one hand, dust clusters trapped in the sheath of an rf discharge have been Studied for different magnetic field strengths ranging from a few milliteslas to 5.8 T. The dynamics of the dust clusters are analyzed in terms of their normal modes. From that various dust properties such as the kinetic temperature, the dust charge and the screening length are derived.

On the other hand, different dust clouds of micron-sized dust particles are trapped in the sheath of the discharge and the self-excited dust density waves were studied for various magnetic field strengths ranging from 0 mT to about 2 T. From the comparison of the measured wave properties and a model dispersion relation the ion density and the dust charge are extracted.