J-GLOBAL         Last updated: Feb 23, 2017 at 14:41
National Institute for Fusion Science
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Research Interests


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Graduate School, Division of Natural Science, The University of Tokyo
Faculty of Science, The University of Tokyo


S. Okamura, K. Matsuoka, R. Akiyama, D. S. Darrow, A. Ejiri, A. Fujisawa, M. Fujiwara, M. Goto, K. Ida, H. Idei, H. Iguchi, N. Inoue, M. Isobe, K. Itoh, S. Kado, et al
Nuclear Fusion   39(9Y) 1337-1350   Sep 1999
Variation of the plasma position relative to the centre of the helical coil winding is a very effective means of controlling the MHD stability and the trapped particle confinement in heliotron/torsatron systems, but improving one of these two char...
K. Tanaka, K. Tanaka, S. Okamura, T. Minami, K. Ida, K. Ida, D. R. Mikkelsen, M. Osakabe, M. Osakabe, Y. Yoshimura, M. Isobe, M. Isobe, S. Morita, S. Morita, K. Matsuoka
Plasma Physics and Controlled Fusion   58    Mar 2016
© 2016 IOP Publishing Ltd.The hydrogen isotope effects of particle transport were studied in the hydrogen and deuterium dominant plasmas of the Compact Helical System (CHS). Longer decay time of electron density after the turning-off of the gas pu...
S. Okamura, K. Matsuoka, K. Nishimura, K. Tsumori, R. Akiyama, S. Sakakibara, H. Yamada, S. Morita, T. Morisaki, N. Nakajima, K. Tanaka, J. Xu, K. Ida, H. Iguchi, A. Lazaros, T. Ozaki, H. Arimoto, A. Ejiri, M. Fujiwara, H. Idei, O. Kaneko, K. Kawahata, T. Kawamoto, A. Komori, S. Kubo, O. Motojima, V. D. Pustovitov, C. Takahashi, K. Toi, I. Yamada
Nuclear Fusion   35(3) 283-296   Dec 1995
High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas...
Shoichi Okamura, Shoichi Okamura
Plasma and Fusion Research   8    Jun 2013
Magnetic configurations of LHD experiment are analyzed based on the Fourier modes of the plasma boundary shapes. It was found that a small number of Fourier modes is sufficient to determine the confinement characteristics of different configuratio...
Shoichi Okamura, Shoichi Okamura
Plasma Physics and Controlled Fusion   55    Mar 2013
Magnetic configurations adopted in the Large Helical Device (LHD (Yamada H et al 2009 Fusion Eng. Des. 84 186)) experiment are analyzed from the viewpoint of their toroidal boundary shape using a Fourier mode representation. A minimum number of Fo...

Research Grants & Projects

Configuration Optimization of Advanced Stellarators
Plasma Confinement Study of Low-Aspect-Ratio Stellarator