Ballooning beta limits of Dee- and bean-shaped tokamaks

1 November 1985

journal article
Published by IOP Publishing in Nuclear Fusion

Vol. 25 (11) , 1543-1554
https://doi.org/10.1088/0029-5515/25/11/003

Abstract

Numerical studies of the beta limit in the first region of stability for n = ∞ ballooning modes in advanced-shaped tokamaks are presented. A higher beta value than corresponds to the present conventional beta scaling is expected for advanced-shaped tokamaks with sufficient triangularity/indentation. Extremely elongated configurations without appropriate triangularity do not lead to an increase in critical beta. Dee or bean shapes with sharply tipped cross-sections are more favourable for achieving high beta values than those with round-tip cross-sections having nearly the same safety factor profile. A new beta scaling for elongated ellipse, Dee- and bean-shaped tokamaks is derived.

Keywords

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