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Highly Resolved Self-Excited Density Waves in a Complex Plasma

Highly Resolved Self-Excited Density Waves in a Complex Plasma Experimental results on self-excited density waves in a complex plasma are presented. An argon plasma is produced in a capacitively coupled rf discharge at a low power and gas pressure. A cloud of microparticles is subjected to effective gravity in the range of 1–4 g by thermophoresis. The cloud is stretched horizontally (width/height ≃ 45 mm / 8 mm ). The critical pressure for the onset of the waves increases with the temperature gradient. The waves are propagating in the direction of the ion drift. The wave frequency, phase velocity, and wavelength are measured, and particle migrations affected by the waves are analyzed at a time scale of 1 ms / frame and a subpixel space resolution. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Highly Resolved Self-Excited Density Waves in a Complex Plasma

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2007 The American Physical Society
ISSN
1079-7114
DOI
10.1103/PhysRevLett.99.095002
pmid
17931015
Publisher site
See Article on Publisher Site

Abstract

Experimental results on self-excited density waves in a complex plasma are presented. An argon plasma is produced in a capacitively coupled rf discharge at a low power and gas pressure. A cloud of microparticles is subjected to effective gravity in the range of 1–4 g by thermophoresis. The cloud is stretched horizontally (width/height ≃ 45 mm / 8 mm ). The critical pressure for the onset of the waves increases with the temperature gradient. The waves are propagating in the direction of the ion drift. The wave frequency, phase velocity, and wavelength are measured, and particle migrations affected by the waves are analyzed at a time scale of 1 ms / frame and a subpixel space resolution.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Aug 31, 2007

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