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Title: Dispersion relations for the dust-acoustic wave under experimental conditions

Abstract

The dust acoustic wave dispersion relation is tested to quantify its sensitivity to many physical processes that are important in laboratory dusty plasmas. It is found that inverse Landau damping and ion-neutral collisions contribute about equally to the growth rate ω{sub i}, pointing to the advantage of using a kinetic model for the instability. The growth rate ω{sub i} increases the most with an increase of dust number density, followed by an increase in ion-drift speed. The quantities that cause ω{sub i} to decrease the most when they are increased are the dust-neutral collision rate followed by the ion-neutral collision rate, ion collection current onto dust particles, and the ion thermal speed. In general, ω{sub i} is affected more than ω{sub r} by the choice of processes that are included. Strong Coulomb-coupling effects can be included in a compressibility term. The susceptibilities derived here can be combined in various ways in a dispersion relation to account for different combinations of physical processes.

Authors:
 [1]
  1. Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242 (United States)
Publication Date:
OSTI Identifier:
22300132
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPRESSIBILITY; CURRENTS; DISPERSION RELATIONS; DUSTS; ION COLLISIONS; LANDAU DAMPING; PLASMA; PLASMA INSTABILITY; SOUND WAVES

Citation Formats

Suranga Ruhunusiri, W. D., E-mail: suranga-ruhunusiri@uiowa.edu, and Goree, J. Dispersion relations for the dust-acoustic wave under experimental conditions. United States: N. p., 2014. Web. doi:10.1063/1.4879816.
Suranga Ruhunusiri, W. D., E-mail: suranga-ruhunusiri@uiowa.edu, & Goree, J. Dispersion relations for the dust-acoustic wave under experimental conditions. United States. https://doi.org/10.1063/1.4879816
Suranga Ruhunusiri, W. D., E-mail: suranga-ruhunusiri@uiowa.edu, and Goree, J. 2014. "Dispersion relations for the dust-acoustic wave under experimental conditions". United States. https://doi.org/10.1063/1.4879816.
@article{osti_22300132,
title = {Dispersion relations for the dust-acoustic wave under experimental conditions},
author = {Suranga Ruhunusiri, W. D., E-mail: suranga-ruhunusiri@uiowa.edu and Goree, J.},
abstractNote = {The dust acoustic wave dispersion relation is tested to quantify its sensitivity to many physical processes that are important in laboratory dusty plasmas. It is found that inverse Landau damping and ion-neutral collisions contribute about equally to the growth rate ω{sub i}, pointing to the advantage of using a kinetic model for the instability. The growth rate ω{sub i} increases the most with an increase of dust number density, followed by an increase in ion-drift speed. The quantities that cause ω{sub i} to decrease the most when they are increased are the dust-neutral collision rate followed by the ion-neutral collision rate, ion collection current onto dust particles, and the ion thermal speed. In general, ω{sub i} is affected more than ω{sub r} by the choice of processes that are included. Strong Coulomb-coupling effects can be included in a compressibility term. The susceptibilities derived here can be combined in various ways in a dispersion relation to account for different combinations of physical processes.},
doi = {10.1063/1.4879816},
url = {https://www.osti.gov/biblio/22300132}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 21,
place = {United States},
year = {Thu May 15 00:00:00 EDT 2014},
month = {Thu May 15 00:00:00 EDT 2014}
}