Journal article
Observation of the spatial growth of self-excited dust-density waves
Physics of plasmas, Vol.17(12), pp.123702-123702-9
12/07/2010
DOI: 10.1063/1.3524691
Abstract
The growth of a naturally occurring dust-density wave (DDW) is experimentally observed using high-speed imaging. This low frequency wave
(
∼
25
Hz
)
grows in amplitude as it propagates downward through a dusty plasma. The wave's linear growth rate
−
k
i
is measured using a phase-sensitive analysis method. For the conditions studied here, the growth rate increases as gas pressure decreases. At a critical gas pressure, which is observed, a balance between an ion-flow instability and dissipation by neutral gas drag determines a threshold for wave propagation. A linear dispersion relation is derived, taking into account the effects of strong-coupling, to compare to the experiment.
Details
- Title: Subtitle
- Observation of the spatial growth of self-excited dust-density waves
- Creators
- T Flanagan - University of IowaJ Goree - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physics of plasmas, Vol.17(12), pp.123702-123702-9
- Publisher
- American Institute of Physics
- DOI
- 10.1063/1.3524691
- ISSN
- 1070-664X
- eISSN
- 1089-7674
- Language
- English
- Date published
- 12/07/2010
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984199777002771
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