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The theoretical beta limit of a bootstrapped tokamak is determined by the Troyon coefficient g and the bootstrap current generation coefficient c(bs). A realistic assessment of the bootstrapped tokamak requires quantitative knowledge of the possible values of g and c(bs) when the current and pressure profiles are related by the bootstrap mechanism. This question is addressed by global numerical calculations, and beta limits are computed for tokamaks of different cross-sections. The beta limit is found to be highly sensitive to shape, and increases with elongation and triangularity.

Additional information

Authors: BONDESON A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37360 ORA
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