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(FTP2/13) Study on the Steady-state Tokamak Reactor with Combined Heating and Current Drive

I. Senda¹⁾, H. Takase²⁾, T. Shoji¹⁾, M. Araki¹⁾, T. Tsunematsu^1)
 
1) Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Ibaraki, Japan
²⁾ Power and Industrial Systems Research and Development Center, Toshiba Corp., Kanagawa, Japan

Abstract.  The control of burning plasma in the compact ITER is investigated by analyses of the heating and current drives combined with the 1.5D transport simulations. The transport coefficients are determined by analyses in ELMy H mode consistently with IPB98(y,2) scaling and the shear-dependent reduction of diffusivity is introduced in the reversed shear (RS) mode. The heating and current drive by the neutral beam injection and the electron cyclotron wave are considered. The long-pulse operations in ELMy H mode with Q = 4.2 and higher are obtained. The loop voltage in the long-pulse operation is less than 0.02V, which corresponds to the burn time 2500 seconds. The steady state operations in RS mode are investigated and operations with Q > 6.5 are obtained. The thermal energy confinement time in RS mode increases more than 30% compared with IPB98(y,2) scaling due to the formation of the internal transport barrier. The position of the transport barrier moves toward the plasma edge as the fusion power is increased. It is found that the burning plasma in RS mode has characteristics to organize its profiles by the balance among itself. For both ELMy H and RS modes, the local heating at the region of low diffusivity improves the performance of the plasma. The possibility to obtain high fusion power ( > 1GW) in RS mode of the compact ITER is discussed.

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