Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session- Dusty Plasmas

P 10.9: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Observation of Dust Particles in the Plasma Sheath of a Strongly Magnetized Plasma — •Hendrik Jung, Franko Greiner, and Alexander Piel — Christian-Albrechts-Universität, Kiel, Germany

The arrangement and interaction of charged dust particles in the plasma sheath of a capacitively coupled rf discharge is influenced by many factors, e.g., the sheath electric field, friction, and wind forces. A special issue is the formation of ion wakes, positive space charge areas that occur due to the focusing of the streaming ions by the negatively charged dust grains. The measurement of the spatial structure of the wake downstream of a particle relies on high-precision techniques as e.g. the phase-resolved resonance method [Jung et al., PoP 22, 053702 (2015)]. Dust in plasmas with high magnetic fields (B>1.5 T) is a major topic in dusty plasma physics. The limited cross field motion of the electrons as well as the ions has substantial impact on the plasma and accordingly on the charging, arrangement, and interaction of the dust. In addition, the magnetic field induces further perturbations as oscillations of particles, the formation of filaments, or ion-driven rotations of the neutral gas column. These disturbances of the particle position impede a high-precision study of the particle system and in particular the wake effects in strong magnetic fields. Thus, systematic investigations of the effects are needed, i.e., their specific influence on the dust and a measurement of the parameter regime of their occurrence.
This work was funded by DFG under contract SFB TR-24/A2.