Lower hybrid experiments on PLT using grills with various n∥spectral widths
- 1 February 1988
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 28 (2) , 217-230
- https://doi.org/10.1088/0029-5515/28/2/004
Abstract
Coupling structures for lower hybrid current drive experiments have, until now, been smaller than a free space wavelength and have had a correspondingly broad wavenumber spectrum. The paper reports the results of experiments on the PLT tokamak using a 16-waveguide grill (2.2 wavelengths) which produces a very narrow n∥ = k∥c/ω spectrum. Experimental results from the 16-waveguide grill are compared with results from three other PLT grills with less sharply defined n1 spectra. The current drive figure of merit, , is approximately 40% higher for the experiments with the 16-waveguide coupler than for previously reported experiments on PLT, in spite of the larger 'spectral gap'. The experimental results are consistent with the first-pass damping of a large fraction of the launched spectrum.Keywords
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