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(PD/2) Full Absorption of 3rd Harmonic ECH in TCV Target Plasmas Produced by 2nd Harmonic ECH and ECCD

S. Alberti¹⁾, T. Goodman¹⁾, M. A. Henderson¹⁾, A. Manini¹⁾, J.-M. Moret¹⁾, P. Gomez¹⁾, P. Blanchard¹⁾, S. Coda¹⁾, O. Sauter¹⁾, C. Angioni¹⁾, K. Appert¹⁾, R. Behn¹⁾, P. Bosshard¹⁾, R. Chavan¹⁾, I. Condrea¹⁾, A. Degeling¹⁾, B. P. Duval¹⁾, D. Fasel¹⁾, J.-Y. Favez¹⁾, I. Furno¹⁾, F. Hofmann¹⁾, P. Lavanchy¹⁾, J. B. Lister¹⁾, X. Llobet¹⁾, Z. A. Pietrzyk¹⁾, A. Gorgerat¹⁾, P. Gorgerat¹⁾, J.-P. Hogge¹⁾, P.-F. Isoz¹⁾, B. Joye¹⁾, J.-C. Magnin¹⁾, B. Marlétaz¹⁾, P. Marmillod¹⁾, Y. R. Martin¹⁾, A. Martynov¹⁾, J.-M. Mayor¹⁾, J. Mlynar¹⁾, P. Nikkola¹⁾, P. J. Paris¹⁾, A. Perez¹⁾, Y. Peysson²⁾, R. A. Pitts¹⁾, A. Pochelon¹⁾, H. Reimerdes¹⁾, J. H. Rommers¹⁾, E. Scavino¹⁾, G. Tonetti¹⁾, M. Q. Tran¹⁾ and H. Weisen^1)
 
1) Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
²⁾ Association Euratom-CEA sur la Fusion, DRFC, CEA-Cadarache, France

Abstract.  An experimental study of the extraordinary mode (X-mode) absorption at the third cyclotron harmonic frequency (118GHz) has been performed on the TCV Tokamak in plasmas preheated by X-mode at the second harmonic (82.7GHz). Various preheating configurations have been experimentally investigated, ranging from counter-ECCD, ECH to CO-ECCD at various power levels. Full absorption of the 470kW of injected X3 power was measured with as little as 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.

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