Dynamics and stability of resistive wall mode in the JT-60U high- plasmas

Matsunaga, Go; Sakamoto, Yoshiteru; Aiba, Nobuyuki; Shinohara, Koji; Takechi, Manabu; Suzuki, Takahiro; Fujita, Takaaki; Isayama, Akihiko; Oyama, Naoyuki; Asakura, Nobuyuki; Kamada, Yutaka; Ozeki, Takahisa; JT-60 Team

The dynamics and stability of the resistive wall mode (RWM) are investigated in the JT-60U high- plasmas, and the sustainment of high- plasmas above the ideal no-wall -limit has been demonstrated using a plasma rotation. We have successfully sustained for , which is about 3 times the current diffusion time . In this high- regime, new MHD instabilities have been observed, that is, an high- bursting mode (HBM) and a slowly growing mode (SGM). These modes play important roles for a MHD stability in the wall-stabilized high region. These results suggest that the kinetic contribution and the rotational shear are important to determine the RWM stability.