Volume 88, Number 6, December 2009
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||04 January 2010|
Measurements of the power spectrum and dispersion relation of self-excited dust acoustic waves
Max-Planck-Institut für extraterrestrische Physik - D-85741 Garching, Germany, EU
2 Department of Physics and Astronomy, The University of Iowa - Iowa City, IA 52242, USA
Corresponding author: email@example.com
Accepted: 25 November 2009
The spectrum of spontaneously excited dust acoustic waves was measured. The waves were observed with high temporal resolution using a fast video camera operating at 1000 frames per second. The experimental system was a suspension of micron-size kaolin particles in the anode region of a dc discharge in argon. Wave activity was found at frequencies as high as 450 Hz. At high wave numbers, the wave dispersion relation was acoustic-like (frequency proportional to wave number). At low wave numbers, the wave frequency did not tend to zero, but reached a cutoff frequency instead. The cutoff value declined with distance from the anode. We ascribe the observed cutoff to the particle confinement in this region.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.27.Gr – Strongly-coupled plasmas / 52.35.Fp – Electrostatic waves and oscillations (e.g., ion-acoustic waves)
© EPLA, 2009
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