Electrostatic instabilities in plasmas with two electron components

Details Electrostatic instabilities in plasmas with two electron components Electrostatic instabilities in plasmas with two electron components

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.8213g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 1, 1985, p. 8213-8221. DOE-sponsored research.

Physics

32

Electron Plasma, Electrostatics, Magnetohydrodynamic Stability, Mathematical Models, Plasma Drift, Frequency Stability, Linear Equations, Maxwell Equation, Plasma Frequencies, Vlasov Equations

Scientific paper

This paper considers the linear theory of electrostatic Vlasov instabilities driven by the relative drift between two Maxwellian electron components in an unmagnetized, homogeneous plasma bearing zero current. The dispersion properties, threshold drift speeds and growth rates of the electron beam instability, the conventional ion acoustic instability, and the ion acoustic beam instability are compared in detailed parametric studies. A new way of illustrating the parameter regimes in whih each of these three instabilities has the lowest threshold drift speed is demonstrated. This leads to clearly illustrated criteria for determining when enhanced electrostatic fluctuations between the ion and the electron plasma frequencies may be observed in plasmas with two electron components. In the case of a hot beam this criterion is a beam density n(b) which satisfies n(b)/n(e) is between 0.05 and 0.30 where n(e) is the total electron density.

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