Abstract
Numerical results on the reversed-field-pinch (RFP) equilibria are presented with use of a partially relaxed state model derived from an energy principle. The relaxation process is assumed to be dominated by the helical tearing mode with a single helicity. The profiles of current densities concentrate more to the magnetic axis in the relaxed state which is dominated by the mode with the lower n toroidal mode number. The maximum available β value with respect to the Suydam criterion is higher in the relaxed state dominated by the higher n mode. Numerical results suggest that experimental RFP plasma has a tendency to relax to the partially relaxed state by the higher n dominant mode.
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