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(EXP2/16) High Ion Temperature Discharge and its Long Sustainment in the Single-Null Configuration on TRIAM-1M

H. Zushi, K. Nakamura, S. Itoh, K. Sato, M. Sakamoto, K. Hanada, E. Jotaki, K. Makino, S. Kawasaki, H. Nakashima

Advanced Fusion Research Center, Research Institute for Applied Mechanics, Kyushu University 87, Kasuga 816-8580, Japan

Abstract.  A high ion temperature discharge in the lower hybrid (LH) current drive scheme has been first obtained in the world in the superconducting tokamak TRIAM-1M. The high ion temperature mode is triggered by a transition which occurs within an operation window for the density, horizontal plasma position and antenna phasing. A steep ion temperature gradient (> 80 keV/m) is formed near the core region at the transition. Long duration operation of this discharge is successfully demonstrated also in the single-null (SN) configuration by the several control technique.

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