Dynamics of stable and unstable externally driven dust clouds

POSTER

Abstract

An individual dust cloud, formed in the anodic glow discharge immersed in a radio-frequency-produced plasma, is shown to support dust-acoustic waves (DAW) if the number of dust grains is sufficiently large. Below this threshold, the dust cloud sloshes and compresses synchronously when the anode voltage is modulated (1-50 Hz). Above this threshold, the dust acoustic waves become resonant when the modulation amplitude is large and the modulation frequency is near the spontaneous dust acoustic frequency. We report on the three-dimensional structure and dynamics of both the cloud and the dust acoustic wave.

Authors

  • Iris Pilch

  • M. Koepke

    West Virginia University, West Virginia University, Morgantown, WV, USA

  • Alexander Piel

    IEAP, CAU Kiel, Olshausenstr. 40-60, 24098 Kiel, Germany, IEAP, Kiel University, 24098 Kiel, Germany

  • Thomas Trottenberg

    Institute for Experimental and Applied Physics, Christian-Albrechts University, D-24098 Kiel, Germany