Stuttgart 2012 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Poster: Staubige Plasmen

P 21.17: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.III

Control of transport and distribution of dust particles in capacitively coupled plasmas — •Shinya Iwashita¹, Giichiro Uchida², Julian Schulze¹, Edmund Schuengel¹, Kazunori Koga², Masaharu Shiratani², Peter Hartmann³, Zoltan Donko³, and Uwe Czarnetzki¹ — ¹Ruhr-University Bochum, Germany — ²Kyushu University, Japan — ³Hungarian Academy of Sciences, Hungary

We have developed a novel method to control the transport of dust particles in capacitively coupled plasmas via the Electrical Asymmetry Effect (EAE). The EAE allows controlling both the spatial potential profile as well as the ion density distribution by adjusting the phase angle θ between a fundamental frequency and its second harmonic, resulting finally in control of forces exerted on dust particles, such as electrostatic and ion drag forces. In this study SiO₂ dust particles of 1.5 µm were injected into the chamber. Adiabatic change of the phase leaves the particles at their equilibrium position close to the lower sheath edge. However, a sudden phase shift leads to a correspondingly abrupt change of the sheath expansion. This introduces the particles instantaneously to a high potential that accelerates them to high kinetic energies. Eventually, this allows transport and even trapping of particles at the opposite sheath. The mechanisms of the dust particle transport realized experimentally are revealed by a Particle-in-Cell simulation and a model.