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P: Fachverband Plasmaphysik
P 16: Low Pressure Plasmas II & Dusty Plasmas II
P 16.4: Vortrag
Freitag, 3. September 2021, 12:00–12:15, H2
Wave turbulence in fluid complex plasmas — •Prapti Bajaj1, Christoph Räth1, Alexei Ivlev2, and Mierk Schwabe1 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR) — 2Max-Planck-Institut für Extraterrestrische Physik
Turbulence is a physical phenomenon observed in out of equilibrium systems exhibiting non-linear properties, and it is being studied intensively in a plethora of fields like fluid dynamics, plasma physics et cetera. Here, we study wave turbulence in a complex plasma, which is a system of micrometer-sized particles embedded in a low-temperature plasma. Our experiment was conducted 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. This makes it possible to study particle behaviour at the kinetic level by using high-speed imaging. Waves form spontaneously in the cloud of confined microparticles due to ion-streaming instability. Our analysis shows that the power spectrum exhibits a slope of -5/3 in Frequency-Fourier space, corresponding to the scaling law predicted for Kolmogorovian turbulence, also observed in many classically turbulent systems. Our aim is to investigate the spectrum of short-scale disturbances generated due to the cascade of different wave modes, and their isotropisation.