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P: Fachverband Plasmaphysik

P 23: Complex Plasmas and Dusty Plasmas II

P 23.3: Vortrag

Donnerstag, 29. Februar 2024, 17:15–17:30, ELP 6: HS 3

Mach cones in Dusty Plasmas under Weigthlessness — •Daniel Maier, Christina Knapek, André Melzer, Daniel Mohr, and Stefan Schütt — Institute of Physics, University of Greifswald, Germany

The concept of the Mach cone is well known from objects moving through air when the velocity of the moving object is higher than the speed of sound. But theoretically a Mach cone can appear in every environment if the velocity of a moving object is higher than the characteristic wave velocity of the surrounding medium.

Accordingly this phenomenon has also be seen in dusty plasmas where micrometer sized particles are added into a low temperature plasma creating a complex system. If now a single particle or a bigger agglomerate of many particles moves through the plasma at a sufficient speed a Mach cone like structure can be observed.

During our last experimental campaign with dusty plasma under weightlessness using a capacitive coupled RF - discharge Mach cone structures caused by particle agglomerates travelling through the plasma were visible. In this contribution first results on the investigations of these Mach cone structures observed with a stereoscopic camera system will be shown.

This project has been funded under the DLR grant 50WM2161.

Keywords: Dusty Plasma; Mach cone; Stereoscopy; Weightlessness