The effects of varying the width of the pressure profile for MHD stability in the Heliotron-E configuration are studied. The calculation employs free-boundary stellarator expansion MHD equilibrium and stability codes, using a model for the Heliotron-E vacuum magnetic field which was constructed by means of a Biot-Savart integration of the exact coil configuration. The calculated critical beta values are in the same range as those observed in Heliotron-E experiments.
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Rewoldt et al. (1987) studied this question.
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