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Effects of edge collisionality on ELM characteristics in the grassy ELM regime

Oyama, Naoyuki; Kojima, Atsushi; Aiba, Nobuyuki; Horton, L. D.*; Isayama, Akihiko; Kamiya, Kensaku; Urano, Hajime; Sakamoto, Yoshiteru; Kamada, Yutaka; JT-60 Team

The effect of the edge collisionality on ELM characteristics has been investigated in the grassy ELM regime on JT-60U. Both in high and low $$q$$ regimes ($$q_{95} > 6$$ and $$q_{95} sim 4.3$$), ELM amplitude becomes higher in plasmas with high edge collisionality. This collisionality dependence is opposite to the dependence observed in type I ELM regime, where the ELM amplitude decreases with increasing the edge collisionality. This collisionality dependence is favorable for next step devices such as ITER.

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Category:Physics, Fluids & Plasmas

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