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Abstract

Stability limits of highly elongated, D-shaped plasmas have been measured in the Tokamak à Configuration Variable (TCV) tokamak. It is found that the plasma current is limited by kink-type disruptions, preceeded by magnetohydrodynamic (MHD) mode activity. The mode structure has been analysed using magnetic fluctuation and soft X-ray diagnostics. Mode numbers, growth rates and experimental stability limits are consistent with ideal and resistive MHD models, based on measured plasma shapes and profiles. These results provide the first experimental confirmation of previously predicted stability limits at high elongation, kappa</=2.58.

Additional information

Authors: HOFMANN F, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);REIMERDES H, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);FURNO I, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);POCHELON A, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Physical Review Letters
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