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TCV has the unique capability of creating a wide variety of plasma shapes, controlled by 16 independent coils. This opens a new domain in tokamak operation which has been explored to investigate the influence of the shape on plasma properties. Large variations in global confinement time within the domain of explored shapes can be explained by direct geometrical effects. No important influence of the shape on local transport coefficients has been found. This work however indicates that a global confinement optimization can be achieved by tuning the plasma shape. Negative triangularity, which may exhibit poor magnetohydrodynamic (MHD) or vertical stability performance, is not the only option. More subtle shape variations can be envisaged and the result of this optimization would be a compromise between the benefit of the geometry and other constraints.

Additional information

Authors: MORET J-M ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24-28, 1996, pp. 27-30
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