Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.11: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Stereoscopic observation of the interaction of fast particle agglomerates with a dusty plasma — •Daniel Maier, Christina Knapek, André Melzer, Daniel Mohr, and Stefan Schütt — Institute of Physics, University of Greifswald, Germany

Fast objects moving through a dispersive medium can interact in various ways and create a variety of phenomena (e.g. Mach cones). The investigation of this interaction has been a topic of research for long times.

Such interactions were observed in experiments with a dusty plasma under microgravity using the "Zyflex" chamber. A cloud of micron sized particles in a low temperature plasma was disturbed by fast particle agglomerates that were unintentionally accelerated to high velocities during the experiments. This disturbance leads to dust-free cavities behind the agglomerates that vary in form and size due to the velocity of the agglomerate and the angle of its moving direction in relation to the plane of the plasma that is illuminated by the laser. Using a stereoscopic camera set-up consisting of four high-speed cameras with a resolution of 2.1 MP at a frame rate of 200 fps it is possible to calculate the spatial position of the dust particles and their movements during the interaction with the fast agglomerates in three dimensions.

In this contribution observations of the described interaction for agglomerates with different velocities and moving angles will be shown focussing on the velocities and density of the surrounding dust particle as well as the spatial characteristics of the the dust-free cavity.

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

Keywords: Dusty Plasma; Stereoscopy; Microgravity