Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 3: Dusty Plasmas I

P 3.6: Vortrag

Montag, 13. März 2017, 15:40–15:55, HS 1010

Single Dust Particles in a Magnetized Plasma: Stability, Charging and Interaction — •Hendrik Jung, Franko Greiner, and Alexander Piel — Institute of Experimental and Applied Physics, Kiel University, Germany

Dust in plasmas with high magnetic fields (B>1.0 T) is a major topic in dusty plasma physics. The magnetization of the plasma leads to fundamental changes of the discharge properties. The limited cross field motion of the plasma constutuents has a substantial impact not only on the plasma itself but also on the charging and interaction of dust grains. The formation of filaments – structures of higher density or temperature that propagate through the magnetized discharge – play a significant role since they impede a stable confinement of the micrometer-sized dust grains and make high-precision studies of the particle system difficult.
In this contribution we show how filaments induce instabilities and heat particles. Pulsing the rf discharge suppresses filament-induced instabilities what can be utilized to get a single particle or a specific particle system to high magnetic fields where stable parameter regimes even in the continuous wave mode can be found and reliable studies of the dust system are performed. By using the well-established phase-resolved resonance method [Jung et al., JPP 82, 615820301 (2016)] the influence of the plasma magnetization on the dust charging and wake formation is investigated.
This work was funded by DFG under contract SFB TR-24/A2.