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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.

Additional information

Authors: ALBERTI S ET AL, Centre de Recherches en Physique des Plasmas, Association Euratom - Confédération Suisse, Lausanne (CH);PEYSSON Y, Association Euratom-CEA sur la fusion, CEA Cadarache, St-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Nuclear Fusion, 42, (2002), pp. 42-45.
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