Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Complex Plasmas and Dusty Plasmas II
P 16.2: Vortrag
Mittwoch, 2. April 2025, 16:30–16:45, ZHG006
Dust acoustic wave properties in varying discharge volumes — •Christina A. Knapek1,2, Mierk Schwabe2,3, Victoriya Yaroshenko2,4, Peter Huber2, Daniel P. Mohr1,2,3, and Uwe Konopka5 — 1Institute of Physics, University of Greifswald, 17489 Greifswald, Germany — 2Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, 51147 Köln, Germany — 3Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, Germany — 4Institut für Solar-Terrestrische Physik, Deutsches Zentrum für Luft- und Raumfahrt, 17235 Neustrelitz, Germany — 5Physics Department, Auburn University, Auburn, Alabama 36849, USA
Properties of self-excited dust acoustic waves under the influence of active compression of the dust particle system were experimentally studied in the laboratory and under microgravity conditions (parabolic flight). Ground based laboratory experiments clearly show that wave properties can be manipulated by changing the discharge volume, its aspect ratio, and thus the dust particle density. Complementary experiments under microgravity conditions, performed to exclude the effects of gravity inflicted sedimentation and anisotropic behavior, 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 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.
Keywords: complex plasma; dust accoustic wave; microgravity research