SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.17: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Dust acoustic wave properties in varying discharge volumes — •Christina A. Knapek1,4, Mierk Schwabe2,4, Victoriya Yaroshenko3,4, Peter Huber4, Daniel P. Mohr1,2,4, and Uwe Konopka5 — 1Institute of Physics, University of Greifswald, Greifswald, Germany — 2Institut für Physik der Atmosphäre, DLR, Oberpfaffenhofen, Germany — 3Institut für Solar-Terrestrische Physik, DLR, Neustrelitz, Germany — 4Institut für Materialphysik im Weltraum, DLR, Köln, Germany — 5Physics Department, Auburn University, Auburn, Alabama, USA
An ion flow through a cloud of microparticles suspended in a low-temperature plasma can induce an ion streaming instability and lead to the formation of dust acoustic waves. The properties of such self-excited dust acoustic waves under the influence of active compression of the dust particle system were experimentally studied. Ground based laboratory experiments show clearly that wave properties can be manipulated by changing the discharge volume and thus the dust particle density. Complementary experiments under microgravity conditions (parabolic flights) were less conclusive due to residual fluctuations in the planes acceleration indicating the need for a better microgravity environment. A theoretical model, using plasma parameters obtained from PIC (particle-in-cell) simulations as input, supports the experimental findings. It shows that the waves can be described as a new observation of the dust acoustic mode which demonstrates their generic character. This work is funded by DLR/BMWi (FKZ 50WP0700, FKZ 50WM1441).