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Report No.
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Long-pulse hybrid scenario development in JT-60U

Oyama, Naoyuki; Isayama, Akihiko; Matsunaga, Go; Suzuki, Takahiro; Takenaga, Hidenobu; Sakamoto, Yoshiteru; Nakano, Tomohide; Kamada, Yutaka; Ide, Shunsuke; JT-60 Team

The performance and sustained duration of long-pulse discharges for ITER hybrid scenario have been improved in JT-60U. The peaked density profile in the core plasma can be maintained with NBIs for central heating even when the density at the pedestal increased in the latter phase of the discharge due to the increase in the divertor recycling. High normalized beta ($$beta_{rm N}$$) of 2.6 and high thermal confinement enhancement factor ($$H_{rm H98(y,2)} > 1$$) was sustained for 25 s ($${sim}14 tau_{rm R}$$, where $$tau_{rm R}$$ is the current diffusion time.) under the ITER relevant small toroidal rotation condition. High $$beta_{rm N}H_{rm H98(y,2)}$$ of 2.6 gives high G-factor ($$beta_{rm N}H_{rm H98(y,2)}/q_{rm 95}^{2}$$) of 0.25 and peaked pressure profile gives large bootstrap current fraction ($$f_{rm BS} > 0.43$$).

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Category:Physics, Fluids & Plasmas

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