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Abstract

ECRH experiments have begun on TCV using the 2nd harmonic in X-mode at 83.7 GHz with power of up to 1Mw of two gyrotrons and a large geometrical flexibility in plasma heating. The heating powers exceed ohmic powers by up to 14 times and electron energy increases up to factors of 3 over ohmic. The experiments have revealed several interesting phenomena. For example during injection of ECW, various central MHD activities have been observed. The transition between these different activity types depends on the power deposition location, heating power, plasma shape, and safety factor. Because the special shapes of sawteeth change within on sawtooth period just after termination of heating, these are most likely associated with local changes of shear rather than global changes of the current distribution.

Additional information

Authors: PIETRYZK Z A, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);BEHN R, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);GOODMAN T P, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);HENDERSON M A, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);HOGGE J, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);POCHELON A, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);TRAN M Q, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);FURNO I, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);MORET J, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);PORCELLI F, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);SAUTER O, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);WEISEN H, Centre de Recherche en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH)
Bibliographic Reference: Article: Proceedings Vol I of 1998 International Congress on Plasma Physics 25th EPS Conference on Controlled Fusion and Plasma Physics, (1998)
Record Number: 199910924 / Last updated on: 1999-07-05
Category: PUBLICATION
Original language: en
Available languages: en