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This report investigates the local 3-D ideal magnetohydrodynamic (MHD) stability properties for two different H-1 Heliar configurations with values of magnetic well of 1.3 and 3.2 %. The pressure profile has been determined that approaches marginal stability to 3-D ballooning modes almost uniformly across the plasma radius for each case. In spite of the difference in well depths, the beta limits for both configurations are almost the same (at beta = 0.8 %). The optimal pressure profile for the deep well configuration is slightly more peaked than that for the standard configuration. The ballooning imposed beta limits are more stringent than those of the Mercier criterion (beta approximately 1 %) and the ballooning optimised pressure profiles are more peaked than the corresponding profiles which are marginal according to the Mercier criterion.

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Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);GARDNER H J, The Australian National University, Research School of Physical Sciences and Engineering, Plasma Research Laboratory and Department of Theoretical Physics, Canberra (AU)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 34 (1994) No. 5, pp. 729-734
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