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An experimental study of the extraordinary mode (X-mode) absorption at the third electron cyclotron (EC) harmonic frequency (118GHz) has been performed on the TCV Tokamak in plasmas preheated by X-mode at the second harmonic (82.7GHz). Fun single-pass absorption of the 470kW of injected X3 power was measured with as little 350KW of X2-CO-ECCD preheating. The measured absorption exceeds that predicted by the linear ray tracing code TORAY 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.

Additional information

Authors: ALBERTI ET AL, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: An article published in:M Physical Review Letters, (2001) pp.1-17
Record Number: 200013680 / Last updated on: 2001-09-18
Original language: en
Available languages: en
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