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Study of lower-hybrid wave propagation in the presence of low-frequency fluctuations

Published online by Cambridge University Press:  13 March 2009

B. Fischer  and
M. Krämer
B. Fischer
Affiliation:
Institut für Experimentalphysik II, Ruhr-Universität Bochum, D-4630 Bochum 1, Germany
M. Krämer
Affiliation:
Institut für Experimentalphysik II, Ruhr-Universität Bochum, D-4630 Bochum 1, Germany
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Abstract

Phase-sensitive probe diagnostics as well as two-point-correlation analysis of radio-frequency probe signals are applied to investigate small-amplitude lower-hybrid (LH) waves launched into a linear nonuniform plasma column by a slow-wave antenna. The LH wave propagation in the inhomogeneous plasma is described by a model taking into account the wavenumber spectrum of the antenna. Special attention is focused on the interaction of the LH waves with the low-frequency density fluctuations. The LH frequency and wavenumber spectra observed can be explained by scattering of the LH waves from the (incoherent) low-frequency density fluctuations. Moreover, the enhanced damping, which is found to be much higher than expected from collisional and electron Landau dampings, is correlated with the level of low-frequency fluctuations.

Type
Research Article
Information
Journal of Plasma Physics , Volume 48 , Issue 3 , December 1992 , pp. 435 - 452
Copyright
Copyright © Cambridge University Press 1992

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