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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 $$l$$$$_{rm i}$$ H-mode. The profiles of the core $$n$$$$_{rm e}$$ and $$T$$$$_{rm e}$$ are tends to be peaked. The H-factor for the core plasma depends strongly on $$l$$$$_{rm i}$$. Higher energy confinement obtained at higher $$l$$$$_{rm i}$$ is attributed to the core confinement improvement. The edge pedestal pressure is not significantly changed by core current density profile. In both $$I$$$$_{rm p}$$ ramp and $$I$$$$_{rm p}$$ scan experiments, the core energy confinement is improved by the increased core $$B$$$$_{rm p}$$ value. The effect of magnetic shear on the confinement should be investigated in next step study.

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