Full absorption of third harmonic ECH in TCV tokamak plasmas in the presence of second harmonic ECCD

An experimental study of the extraordinary mode (X mode) absorption at the third electron cyclotron harmonic frequency has been performed on the TCV tokamak in plasmas preheated by X mode at the second harmonic. Full single pass absorption of injected X3 power was measured with X2 preheating in co-current drive (CO-ECCD). The measured absorption exceeds that predicted by the linear ray tracing code TORAY-GA by more than a factor of 2 for the CO-ECCD case. Experimental evidence indicates that a large fraction of the X3 power is absorbed by electrons in an energetic tail created by the X2 ECCD preheating.


Published in:
Nuclear Fusion, 42, 1, 42-45
Year:
2002
ISSN:
0029-5515
ISBN:
0029-5515
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-09-13


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