The influence of non-uniform toroidal plasma rotation on the stability of resistive wall modes is analysed for high-β advanced tokamak equilibria, using toroidal ideal MHD. For advanced tokamak equilibria with q min in the range of 1.6-2.1, a main role is played by the rotation at the resonance where q ⋍2. A rotation frequency of at least 3% of the central Alfvén frequency is required around at the q ⋍2 resonance in order to raise the ideal β limit significantly above the no-wall value. Certain types of rotation profiles do not lead to stabilization at any rotation velocity. Comparison with experimental results from DIII-D indicates that ideal MHD thresholds are in reasonable agreement with experiment.
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Gregoratto et al. (2001) studied this question.
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