Issue |
EPL
Volume 88, Number 6, December 2009
|
|
---|---|---|
Article Number | 65001 | |
Number of page(s) | 6 | |
Section | Physics of Gases, Plasmas and Electric Discharges | |
DOI | https://doi.org/10.1209/0295-5075/88/65001 | |
Published online | 04 January 2010 |
Measurements of the power spectrum and dispersion relation of self-excited dust acoustic waves
1
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: nosenko@mpe.mpg.de
Received:
1
September
2009
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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