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

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 cesium and potassium ion beams in cesium and potassium Q-machine plasmas. The ion beams are injected along the magnetic field with care to avoid beam transverse velocities. The observed ion-cyclotron mode frequencies are below those driven by electron currents. These resonant instabilities are convective in character with small spatial growth rates ki/kr ≃ 0.05. 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. 237 - 252
Copyright
Copyright © Cambridge University Press 1978

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