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Ion beam excitation of ion-cyclotron waves and ion heating in plasmas with drifting electrons

Published online by Cambridge University Press:  13 March 2009

J. P. Hauck ,
H. Böhmer ,
N. Rynn  and
Gregory Benford
J. P. Hauck
Affiliation:
Department of Physics, University of California, Irvine, California 92717
H. Böhmer
Affiliation:
Department of Physics, University of California, Irvine, California 92717
N. Rynn
Affiliation:
Department of Physics, University of California, Irvine, California 92717
Gregory Benford
Affiliation:
Department of Physics, University of California, Irvine, California 92717
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Abstract

Ion-cyclotron waves are excited by a cesium ion beam in a cesium Q-machine plasma with drifting plasma electrons. These interactions differ significantly from those in the case of drifting ions in that the drifting electrons play an active role in the instability mechanism. The observed mode frequencies are slightly below those of the electron current driven modes. These waves can be convectively or absolutely unstable, depending on the ion beam velocity. For low beam velocities the instabifities are convective in character with large spatial growth rates ki/kr ∼ 0.2. For larger beam velocities the instabilities are absolute in character with temporal growth rates 0.04. The absolute instabilities are similar to two-stream instabilities. Plasma ion heating is observed and is consistent with a model in which mode amplitudes are saturated by diffusion effects.

Type
Research Article
Information
Journal of Plasma Physics , Volume 19 , Issue 2 , April 1978 , pp. 253 - 265
Copyright
Copyright © Cambridge University Press 1978

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References

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