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The energy confinement time of ohmic L-mode plasmas was observed to depend strongly on the shape, improving slightly with elongation and degrading strongly at positive triangularity. This dependence can be explained by geometrical effects on temperature gradient combined with power degradation, without invoking a poloidal variation or a shape dependence of the transport coefficients. The variation with the shape of the sawtooth and Mirnov activity of these plasmas may be the consequence rather than the cause of the change in the confinement.

Additional information

Authors: MORET J M ET AL, Centre de Recherches en Physique des Plasmas, Association EURATOM � Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: 16th IAEA Fusion Energy Conference, Montreal (CA), October 7-11, 1996
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