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Electrostatic instabilities and anomalous transport excited by an energetic ion beam

Published online by Cambridge University Press:  13 March 2009

E. H. da Jornada ,
J. D. Gaffey Jr  and
M. Zales Caponi
E. H. da Jornada
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, 90000 Porto alegre, RS, Brasil
J. D. Gaffey Jr
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, 90000 Porto alegre, RS, Brasil
M. Zales Caponi
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, 90000 Porto alegre, RS, Brasil
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Abstract

Electrostatic instabilities excited by an energetic ion beam injected at an arbitrary angle with respect to the magnetic field in a collisionless plasma are discussed. Threshold conditions on the angle of injection and on the beam density are derived for the cross-field ion-ion mode, the modified two-stream mode and the ion-acoustic modes. The time evolution of the momentum and the thermal energy of each plasma component in the presence of the instabilities is calculated from moments of the quasi-linear equation. The background ions are significantly heated by most of the waves, exceptions being the modified two-stream mode and the resonant ion-acoustic mode. A wave with phase velocity close to the slow ion-acoustic wave has been found when the beam has a small density and a velocity greater than the acoustic speed by approximately a factor of five.

Type
Research Article
Information
Journal of Plasma Physics , Volume 26 , Issue 2 , October 1981 , pp. 193 - 216
Copyright
Copyright © Cambridge University Press 1981

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References

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