Experimental study of non-thermal electron generation by lower hybrid waves in the ASDEX tokamak
- 1 August 1986
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 26 (8) , 1106-1111
- https://doi.org/10.1088/0029-5515/26/8/013
Abstract
High resolution X-ray spectroscopy was used to evaluate the fractional population of non-thermal electrons generated when electromagnetic waves in the lower hybrid frequency range are launched in the ASDEX tokamak. In complete current drive discharges a typical value of 1% is found for this parameter, in agreement with a theoretical estimate. Furthermore, it is shown that the toroidal electric field is very effective in enhancing tail electron generation, as confimed by β measurements, and that the wave penetration to the plasma centre is inhibited when interaction of the waves with plasma ions is the dominant damping mechanism.Keywords
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