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Spontaneous excitation of waves due to anisotropic velocity distribution in GAMMA 10 and JT-60U

Ichimura, Makoto*; Yamaguchi, Yusuke*; Sato, Shoichi*; Katano, Makoto*; Ouchi, Toshiaki*; Muro, Taishi*; Sekihara, Yusuke*; Murakami, Tatsuya*; Moriyama, Shinichi; Kobayashi, Takayuki; Kojima, Atsushi; Shinohara, Koji; Sakamoto, Yoshiteru; Watanabe, Tsuguhiro*; Imai, Tsuyoshi*

Fluctuations in the ion cyclotron range of frequency are investigated both on GAMMA 10 and JT-60U. Ion cyclotron emissions (ICEs) due to deuterium-deuterium fusion-product (FP) ions on JT-60U are described. ICE due to H-ions is newly identified. ICE(T) with lower frequency has larger wave numbers than ICE ($$^{3}$$He) in the same discharge. The excitation of slow Alfv$'e$n waves is elucidated for the first time as the mechanism for ICE due to T-ions. The anisotropy of T-ions at the outer plasma edge is evaluated by using Escape Particle Orbit analysis Code (EPOC).



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