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P: Fachverband Plasmaphysik

P 13: Dusty Plasmas

P 13.5: Vortrag

Mittwoch, 30. März 2022, 17:00–17:15, P-H11

Artificial voids in nanodusty plasmas — Ulrike Küst and •Franko Greiner — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

Artificial voids are an interesting and frequently studied phenomenon in dusty plasmas [E. Thomas POP 2004, M. Klindworth RSE 2007, O. Arp PRE 2011, M. Schwabe NJP 2017]. Voids are created by projectiles shot into the dust cloud or by electrostatic probes. We investigated artificial voids created in nanodusty plasmas at high electron depletion. By variation of the probe voltage, the size of the void can be varied. The voids are not stable at probe potentials near the local plasma potential. Instead, the whole cloud is destabilized and strong dust streaming is observed. We present a simple force balance that explains the linear increase of the void radius for probe bias variation in the dust repelling regime (negative probe voltage in reference to the plasma potential). The ability to use this force model to estimate the plasma potential and the consequences for credible Langmuir probe measurements in nanodusty plasmas are discussed (see video https://youtu.be/Nmz2nR8uTrE or search the internet for "nanodustcloud").