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Ion–acoustic instability of the positive column

Published online by Cambridge University Press:  13 March 2009

D. B. Ilić ,
G. M. Wheeler ,
F. W. Crawford  and
S. A. Self
D. B. Ilić
Affiliation:
Institute for Plasma Research, Stanford University
G. M. Wheeler
Affiliation:
Institute for Plasma Research, Stanford University
F. W. Crawford
Affiliation:
Institute for Plasma Research, Stanford University
S. A. Self
Affiliation:
Institute for Plasma Research, Stanford University
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Abstract

The excitation characteristics of the current-driven ion acoustic instability are studied, using a linearized kinetic model for a weakly ionized, unmagnetized plasma. Convective instability is predicted for typical low-pressure positive column conditions. The calculated spatial growth rates show a variation with frequency, which is similar to that of the amplitude variation with frequency of the self-excited instability measured in our positive column experiments in helium and argon. The comparison between theory and experiment indicates that ion Landau damping is significant for typical experimental conditions.

Type
Research Article
Information
Journal of Plasma Physics , Volume 12 , Issue 3 , December 1974 , pp. 433 - 444
Copyright
Copyright © Cambridge University Press 1974

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References

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