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Criteria governing ion-acoustic waves in two-ion plasmas

Published online by Cambridge University Press:  13 March 2009

I. M. A. Gledhill  and
M. A. Hellberg
I. M. A. Gledhill
Affiliation:
Plasma Physics Research Institute, Department of Physics, University of Natal, Durban, South Africa
M. A. Hellberg
Affiliation:
Plasma Physics Research Institute, Department of Physics, University of Natal, Durban, South Africa
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Abstract

It has previously been observed that ion-acoustic waves exhibit two types of behaviour as the proportion of light ions in a mixed plasma is varied. Either the principal mode of the heavy ion plasma changes continuously into that of the light ion plasma, or it becomes too heavily damped to be observable while a second wave appears and develops into the principal light ion mode. A similar phenomenon is observed as the wavenumber or the ratio of electron temperature to ion temperature is changed. Criteria determining which behaviour occurs are derived by considering the form of the dielectric response function. The results may also be used to predict which of the higher-order modes of the plasma is involved in the process, and whether degeneracies exist in the dispersion relation.

Type
Research Article
Information
Journal of Plasma Physics , Volume 36 , Issue 1 , August 1986 , pp. 75 - 96
Copyright
Copyright © Cambridge University Press 1986

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