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An analysis of the effect of magnetic geometry on heat flux in a wide range of Single Null discharge configurations with k95 between 1.5 to 2.2, delta95 between 0.2 to 0.45 suggests that elongation is beneficial for confinement. If heat diffusivities are assumed not to depend on plasma shape, the predicted exponent for a power law scaling with elongation is alpha-x equals to 0.74, based on the configurations in the study. This is very close to dependences from the ITER database for discharge conditions, such as ELMy H-modes, obtained from a large number of experiments in various tokamak devices.

Additional information

Authors: WEISEN H ET AL, Centre de Recherches en Physique des Plasmas, Association Euratom - Confédération Suisse, Lausanne (CH)
Bibliographic Reference: Internal report LRP 721/02, March 2002, pp 7. The report will also be published as a letter in the journal Nuclear Fusion.
Availability: Available free of charge from: Ecole polytechnique federale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne. Fax +41-21-6934747.
ISBN: ISSN: 0458-5895
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