Heat transport and pedestal structure of H-mode in the variation of current density profiles in JT-60U

Urano, Hajime; Sakamoto, Yoshiteru; Suzuki, Takahiro; Fujita, Takaaki; Kamiya, Kensaku; Isayama, Akihiko; Kamada, Yutaka; Takenaga, Hidenobu; Oyama, Naoyuki; Matsunaga, Go; Ide, Shunsuke; Idomura, Yasuhiro   ; JT-60 Team

Dependence of the H-mode confinement and pedestal structure on the plasma current is investigated. Higher energy confinement is obtained in higher H-mode. The profiles of the core and are tends to be peaked. The H-factor for the core plasma depends strongly on . Higher energy confinement obtained at higher is attributed to the core confinement improvement. The edge pedestal pressure is not significantly changed by core current density profile. In both ramp and scan experiments, the core energy confinement is improved by the increased core value. The effect of magnetic shear on the confinement should be investigated in next step study.