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(PD/T-2) Formation of an Advanced Tokamak Plasma without the Use of Ohmic Heating Solenoid in JT-60U

Y. Takase¹⁾, S. Ide²⁾, S. Itoh³⁾, O. Mitarai⁴⁾, O. Naito²⁾, T. Ozeki²⁾, Y. Sakamoto²⁾, S. Shiraiwa¹⁾, T. Suzuki²⁾, S. Tanaka⁵⁾, T. Taniguchi¹⁾, M. Aramasu¹⁾, T. Fujita²⁾, T. Fukuda²⁾, X. Gao⁶⁾, M. Gryaznevich⁷⁾, K. Hanada³⁾, E. Jotaki³⁾, Y. Kamada²⁾, T. Maekawa⁵⁾, Y. Miura²⁾, K. Nakamura³⁾, T. Nishi¹⁾, H. Tanaka⁵⁾, K. Ushigusa²⁾, JT-60 Team
 
¹⁾ The University of Tokyo, Tokyo, Japan
²⁾ Japan Atomic Energy Research Institute, Naka, Japan
³⁾ Kyushu University, Kasuga, Japan
⁴⁾ Kyushu Tokai University, Kumamoto, Japan
⁵⁾ Kyoto University, Kyoto, Japan
⁶⁾ Institute of Plasma Physics, Academia Sinica, Hefei, China
⁷⁾ EURATOM/UKAEA Fusion Association, Abingdon, UK

Abstract.  An integrated scenario consisting of (1) a novel plasma start-up method using the vertical field and shaping coils, (2) an intermediate noninductive ramp-up stage, and (3) controlled transition to a high-density, bootstrap-dominated, high-confinement plasma has been demonstrated for the first time on the JT-60U tokamak. It was shown that plasma current can be ramped up even with a negative vertical field (in the direction opposite to that required for toroidal equilibrium) provided that there is a strong source of plasma. The plasma created by this technique had both internal and edge transport barriers, and had $\beta_{p}^{}$ = 3.6 ( $\epsilon$$\beta_{p}^{}$ =1), $\beta_{N}^{}$ = 1.6 (marginally stable to the n =1 kink-ballooning mode), H_H98y2 = 1.6 and f _BS $\ge$ 90% at I_p = 0.6 MA and n_e = 0.5_nGW. In these experiments, inboard turns of the shaping coil supplied about 20% of the total poloidal flux input, but further improvement is possible. This result opens up the possibility of OH-less operation, which is a requirement for ST reactors, and can also make a substantial improvement in the economic competitiveness of conventional aspect ratio tokamak reactors. 1.

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