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Production of plasma vortices by lower-hybrid waves

Published online by Cambridge University Press:  13 March 2009

M. Y. Yu ,
P. K. Shukla  and
H. U. Rahman
M. Y. Yu
Affiliation:
Institut für Theoretische Phusik, Ruhr-Universität Bochum, 4630 Bochum 1, Federal Republic of Germany
P. K. Shukla
Affiliation:
Institut für Theoretische Phusik, Ruhr-Universität Bochum, 4630 Bochum 1, Federal Republic of Germany
H. U. Rahman
Affiliation:
Institut für Theoretische Phusik, Ruhr-Universität Bochum, 4630 Bochum 1, Federal Republic of Germany
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Abstract

Nonlinear excitation of electrostatic and magnetostatic zero-frequency modes by finite-amplitude lower-hybrid waves is considered. It is found that modulational instabilities can give rise to enhanced plasma vortices. Dispersion relations, as well as analytical expressions for the growth rates, are obtained. The enhanced vortices may cause anomalous cross-field diffusion which can affect plasma confinement in tokamak devices when lower-hybrid waves are used for plasma heating or current drive. We found that magnetic fluctuations associated with the parametrically driven magnetostatic mode are of particular importance in tokamak plasmas.

Type
Research Article
Information
Journal of Plasma Physics , Volume 26 , Issue 2 , October 1981 , pp. 359 - 367
Copyright
Copyright © Cambridge University Press 1981

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