Enhancement of efficiency for lower hybrid current drive by electron cyclotron heating in the WT-2 tokamak
- 1 January 1986
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 26 (1) , 107-111
- https://doi.org/10.1088/0029-5515/26/1/010
Abstract
Injection of electron cyclotron (EC) waves into the lower hybrid (LH) current-sustained plasma in WT-2 increases the efficiency and the ramp-up rate of the LH-driven current when the high-energy electrons that couple to the LH waves are EC-heated. On the contrary, the efficiency decreases and the current ramp-up rate becomes negative when the bulk electrons are EC-heated. This selective EC-heating of bulk electrons or high-energy electrons is achieved by changing the radial position of the EC resonance layer in the plasma column.Keywords
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