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Effect of poloidal rotation on ELM and RWM in toroidally rotating tokamaks

Aiba, Nobuyuki; Shiraishi, Junya; Tokuda, Shinji*; Yagi, Masatoshi

Numerical analysis is performed for identifying the poloidal rotation effect on the stability of edge localized MHD mode, which relates to the type-I ELM, and that of the resistive wall mode (RWM), which sometimes causes a disruption. This analysis clarifies that the poloidal rotation observed experimentally can destabilize the edge localized MHD mode but stabilize RWM. Furthermore, when the plasma rotates in both the toroidal and the poloidal directions, MHD stability depends on the direction of the toroidal rotation. This dependence is qualitatively consistent with the experimental result of the relation between ELM phenomena and the toroidal rotation direction in JT-60U. Though this dependence of RWM is not discussed until now, this result suggests that we need to confirm whether or not this dependence can be observed experimentally to stabilize RWM in JT-60SA and ITER.

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