Nonlinear simulation of energetic particle driven modes in JT-60U

JT-60Uにおける高エネルギー粒子駆動モードの非線形シミュレーション

Bierwage, A.; 相羽 信行; Deng, W.*; 石川 正男; 松永 剛; 篠原 孝司; 藤堂 泰*; 矢木 雅敏

Bierwage, A.; Aiba, Nobuyuki; Deng, W.*; Ishikawa, Masao; Matsunaga, Go; Shinohara, Koji; Todo, Yasushi*; Yagi, Masatoshi

Energetic Particle Modes observed in JT-60U are studied using the global nonlinear code MEGA. For the first time, these modes are simulated in realistic geometry and with realistic bulk plasma pressure. The effect of plasma shaping, bulk pressure and compressibility is examined, looking at the linear growth, initial nonlinear saturation, nonlinear evolution and energetic particle transport. It is found that growth, saturation and evolution of the MHD modes vary significantly depending on the simulation setup. However, the resulting particle transport caused by these strongly driven modes is not correlated to the growth rates and saturation levels. The reduction of the energetic ion density in the central region of the plasma is comparable in all cases studied: circular and shaped plasma, zero and finite bulk beta, weak and strong compressibility effect.