Journal Article Overview of spherical tokamak research in Japan

高瀬, 雄一  ,  Ejiri, A.  ,  Fujita, T.  ,  Fukumoto, N.  ,  Fukuyama, A.  ,  Hanada, K.  ,  Idei, H.  ,  Nagata, M.  ,  Ono, Y.  ,  Tanaka, H.  ,  M.Uchida  ,  Horiuchi, R.  ,  鎌田, 裕  ,  Kasahara, H.  ,  Masuzaki, S.  ,  Nagayama, Y.  ,  Oishi, T.  ,  Saito, K.  ,  Takeiri, Y.

57 ( 10 )  , p.102005 , 2018-05 , IOP Publishing
Nationally coordinated research on spherical tokamak is being conducted in Japan. Recent achievements include: (i) plasma current start-up and ramp-up without the use of the central solenoid by RF waves (in electron cyclotron and lower hybrid frequency ranges), (ii) plasma current start-up by AC Ohmic operation and by coaxial helicity injection, (iii) development of an advanced fuelling technique by compact toroid injection, (iv) ultra-long-pulse operationand particle control using a high temperature metal wall, (v) access to the ultra-high-β regime by high-power reconnection heating, and (vi) improvement of spherical tokamak plasma stability by externally applied helical field.

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