Mainz 2022 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 13: Dusty Plasmas
P 13.2: Vortrag
Mittwoch, 30. März 2022, 16:15–16:30, P-H11
Studying the feasibility to observe turbulence in fluid complex plasmas — •Prapti Bajaj1, Alexei Ivlev2, Christoph Räth1, and Mierk Schwabe1 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR) — 2Max-Planck-Institut für Extraterrestrische Physik
Turbulence is a phenomenon observed in a dissipative system far away from thermodynamic equilibrium with many degrees of freedom and it has been studied in fields varying from microscopic to macroscopic scales[1]. In this work, we study the feasibility to observe turbulence in fluid complex plasmas, i.e., a system of micrometer-sized particles embedded in a low-temperature plasma. We performed an experiment in the ground-based setup of PK-3 Plus, where microparticles were injected in a capacitively coupled RF-plasma chamber and a laser illuminated a vertical cross-section of the microparticle cloud. Below a critical pressure, we observed self-excited Dust Acoustic Waves, which we then used to study the properties of turbulence in our system. These waves are generated due to the ion-streaming instability, i.e., motion of ions past the microparticles. Using high-speed imaging, we were able to track individual microparticles to perform a robust spatial and temporal analysis. We use novel analytical tools to study the energy spectrum in the space and time domains. Our aim is to study the spectrum of short-scale disturbances generated due to the cascade of different wave modes[1], and their isotropisation, even in the presence of a background friction force, as in the case of complex plasmas.
[1] ``Wave Turbulence" by S. Nazarenko, Springer(2011).