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During initial studies of electron cyclotron resonance heating (ECRH) in the tokamak à configuration variable (TCV), non-standard central magnetohydrodynamic (MHD) activities, such as humpbacks, saturated and inverted sawteeth, have been observed while changing the heating location, the ECRH power, the plasma shape and the safety factor. For edge safety factors q(a) > 4.5, safety factor on axis q(0)<1 and small plasmas, complete sawtooth stabilization was achieved with the present 1 MW gyrotron power and it is likely that sawtooth stabilization can be achieved for all conditions at higher ECRH power. The conditions under which the various relaxation activities are produced or suppressed are reported and the origins for such non-standard behaviour are discussed.

Additional information

Authors: PIETRZYK Z A ET AL, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse (CH);PORCELLI F, INFM and Politecnico di Torino (IT);RAZUMOVA K A, Russian Research Centre Kurchatov, Moscow (RU)
Bibliographic Reference: Article: Nuclear Fusion (1998)
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