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Anomalous transport and anomalous heating due to lower-hybrid wave fields

Published online by Cambridge University Press:  13 March 2009

M. Krämer ,
N. Sollich  and
J. Dietrich
M. Krämer
Affiliation:
Institut für Experimentalphysik II, Ruhr-Universität Bochum, Federal Republic ofGermany
N. Sollich
Affiliation:
Institut für Experimentalphysik II, Ruhr-Universität Bochum, Federal Republic ofGermany
J. Dietrich
Affiliation:
Institut für Experimentalphysik II, Ruhr-Universität Bochum, Federal Republic ofGermany
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Extract

The microscopic and macroscopic behaviours of a linear reflex discharge in the presence of low-frequency turbulence are investigated under the action of moderate lower-hybrid wave power. The frequency and wavenumber spectra of both the low-frequency fluctuations and the high-frequency waves are measured using a correlation-analysis technique with two probes. The low-frequency fluctuations may be attributed to drift-wave turbulence. The fluctuation level is raised when RF power is coupled to the plasma, thus leading to considerably enhanced radial transport. The coupling between low-frequency fluctuations and high-frequency waves can be seen clearly from the spectra. The high-frequency wavenumber spectra measured inside the antenna are in reasonable agreement with the lower-hybrid wave dispersion. However, the wavenumbers observed in the lower-hybrid resonance region outside the antenna are – in contrast with expectation – not larger than in the plasma edge region. From the electric-field energy-density spectra and from measurements of the density and the temperatures, a detailed energy balance can be performed. The calculated heating rates are anomalously large for both the electrons and the ions. The absorption processes, relevant for the present experiment, are discussed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 39 , Issue 3 , June 1988 , pp. 447 - 474
Copyright
Copyright © Cambridge University Press 1988

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