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Roles of toroidal rotation at the plasma edge, toroidal field ripple and configuration on ELMs in the JT-60U tokamak

Kamiya, Kensaku; Urano, Hajime; Oyama, Naoyuki; Kamada, Yutaka

Effects of plasma rotation and losses of fast ion on the Type-I ELM characteristics have been systematically studied in the JT-60U tokamak, scanning combinations of NBI (tangential co-, balanced-, and counter-NBI plus perpendicular NBI) at the three types of plasma configurations (corresponding toroidal field ripple at the plasma edge, 0.4, 1, and 2%). New findings on the Type-I ELM characteristics are as follows. Smaller ELM energy loss normalized by pedestal stored energy, and more frequent ELM frequency, are confirmed in the counter-NBI in comparison to the co-NBI discharges. Nevertheless, the power loss due to ELM normalized by heating power crossing the separatrix is constant regardless of the direction of the momentum injection at each plasma configurations.

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