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In TCV, inward or outward convection in the core of ECH and ECCD plasmas is observed, depending on discharge conditions. In sawtoothing discharges with central ECH, outward convection is observed when a quasi continuous m = 1 kink mode is present, resulting in inverted sawteeth on the central electron density, while in the absence thereof, inward convection between successive sawtooth crashes leads to 'normal' sawteeth. The occurrence of a kink mode depends sensitively on plasma triangularity. When sawteeth are stabilised with central Co- or Counter-ECCD, stationary hollow electron density profiles are observed in the presence of m = 1 modes, while peaked or flat profiles are observed in MHD quiescent discharges. The observation of peaked density profiles in fully EC driven plasmas demonstrates that pinch processes other than the Ware pinch must be responsible for these phenomena.

Additional information

Authors: FURNO I, Los Alamos National Laboratory, Los Alamos (US);WEISEN H ET AL, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: An article due to be published in Physics of Plasmas, and in EPFL internal report 760/03
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
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