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Abstract

The ability of TCV to produce a wide variety of plasma shapes has allowed an investigation of magnetohydrodynamic (MHD) behaviour in a large number of limited ohmic L-mode discharges in which the elongation and the triangularity have been varied over a wide range. A 200 channel soft X-ray tomography system in conjuction with toroidally spaced soft X-ray diodes has been used to study the structure of internal disruptions and MHD modes. A strong reduction of sawtooth amplitude is observed as the plasma triangularity is decreased together with an increase in mode activity. The reduced sawtooth amplitudes are not correlated with any significant changes of the inversion radius and hence are not simply due to changes in current profiles; the inversion radius however is strongly correlated with the Spitzer conductivity profile and with the edge safety factor.

Additional information

Authors: FURNO I, Centre de Recherches des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);WEISEN H, Centre de Recherches des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);MORET J M, Centre de Recherches des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);BLANCHARD P, Centre de Recherches des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ANTON M, Centre de Recherches des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings of 24th EPS Conference on Controlled Fusion and Plasma Physics, Berchtesgaden 9-13 June 1997
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