Overview of spherical tokamak research in Japan

Y. Takase, A. Ejiri, T. Fujita, N. Fukumoto, A. Fukuyama, K. Hanada, H. Idei, M. Nagata, Y. Ono, H. Tanaka, M. Uchida, R. Horiuchi, Y. Kamada, H. Kasahara, S. Masuzaki, Y. Nagayama, T. Oishi, K. Saito, Y. Takeiri, S. Tsuji-Iio

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Abstract

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 operation and 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.

Original languageEnglish
Article number102005
JournalNuclear Fusion
Volume57
Issue number10
DOIs
Publication statusPublished - Jun 20 2017

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Takase, Y., Ejiri, A., Fujita, T., Fukumoto, N., Fukuyama, A., Hanada, K., Idei, H., Nagata, M., Ono, Y., Tanaka, H., Uchida, M., Horiuchi, R., Kamada, Y., Kasahara, H., Masuzaki, S., Nagayama, Y., Oishi, T., Saito, K., Takeiri, Y., & Tsuji-Iio, S. (2017). Overview of spherical tokamak research in Japan. Nuclear Fusion, 57(10), [102005]. https://doi.org/10.1088/1741-4326/aa62c1