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Combined non-inductive current drive in a high confinement reversed magnetic shear plasma at high normalized density in JT-60U

Ide, Shunsuke; Fujita, Takaaki; Suzuki, Takahiro; Hatae, Takaki; Naito, Osamu; Kamada, Yutaka; Seki, Masami

Non-inductive full current drive (CD) in a reversed magnetic shear plasma (RS) with high energy confinement of 1.4 times the H-mode scaling at 82% of the Greenwald density has been achieved simultaneously for the first time in a tokamak; these results were obtained in the JT-60U tokamak. The full-CD state was realized by a combination of waves in the lower hybrid range of frequency and neutral beam injection together with high bootstrap current fraction ($$f_{rm bs}$$) of 62% to the total plasma current. The combination has demonstrated for the first time active current profile modification in a high $$f_{rm bs}$$ RS plasma both in the core and in peripheral regions.

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Category:Physics, Fluids & Plasmas

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