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The marginal pressure profile that is imposed either by ideal ballooning modes or by interchange modes on every nested flux surface of a three-dimensional equilibrium modelling the ATF device is determined for conditions of vanishing net toroidal plasma current. The corresponding limiting values are beta=3.75% and beta(0) = 9.89%. Mercier modes dominate in regions of strong stellarator - like magnetic shear. Non-symmetric ballooning modes (non-symmetric eigenstructures in the extended poloidal angle domain) dominate in regions with strong tokamak-like magnetic shear.

Additional information

Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne, 21 avenue des Bains, CH-1007 Lausanne (CH);HIRSHMAN S P, Oak Ridge National Laboratory, Oak Ridge, Tennessee (US);LEE D K, Oak Ridge National Laboratory, Oak Ridge, Tennessee (US)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 29 (1989), No. 4, pp. 617-627
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