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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), HH98y2 = 1.6 and f BS $ \ge$ 90% at Ip = 0.6 MA and ne = 0.5nGW. 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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IAEA 2003