151 Papers
1.4K Citations
S. Okamura is an academic researcher from National Institutes of Natural Sciences, Japan. The author has contributed to research in topics: Plasma & Magnetic field. The author has an hindex of 28, co-authored 148 publications.
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Papers
Electron thermal transport barrier and density fluctuation reduction in a toroidal helical plasma
Akihide Fujisawa,H. Iguchi,T. Minami,Yasuo Yoshimura,H. Sanuki,Kimitaka Itoh,S. Lee,Kenji Tanaka,Masashi Yokoyama,Mamoru Kojima,S.-I. Itoh,S. Okamura,R. Akiyama,Katsumi Ida,Mitsutaka Isobe,S. Morita,Shin-Ichiro Nishimura,Masaki Osakabe,Akihiro Shimizu,Chihiro Takahashi,K. Toi,Y. Hamada,Ken Matsuoka,M. Fujiwara +23 more
TL;DR: A thermal transport barrier resulting in a high central electron temperature of $\ensuremath{sim}2\mathrm{keV}$ is established in the core of electron-cyclotron-resonance heated plasmas of the Compact Helical System Heliotron/Torsatron.
180
Physics and engineering design studies on the Large Helical Device
Osamu Motojima,Kenya Akaishi,Kozo Fujii,S. Fujiwaka,Shinsaku Imagawa,Hantao Ji,Hiroshi Kaneko,S. Kitagawa,Y. Kubota,Ken Matsuoka,Toshiyuki Mito,S. Morimoto,Arata Nishimura,K. Nishimura,N. Noda,I. Ohtake,Nobuyoshi Ohyabu,S. Okamura,Akio Sagara,Mizuki Sakamoto,Sadao Satoh,Kazuya Takahata,Hitoshi Tamura,S. Tanahashi,Toshihiro Tsuzuki,Shuichi Yamada,Hiroshi Yamada,Kozo Yamazaki,Nagato Yanagi,H. Yonezu,Junya Yamamoto,Masami Fujiwara,A. Iiyoshi +32 more
TL;DR: The construction of the Large Helical Device (LHD) is progressing as a seven-year project in Japan, which began in 1990 as mentioned in this paper, and necessary research and development programs are nearly reaching the final goal of the original schedule.
103
Experimental study of the bifurcation nature of the electrostatic potential of a toroidal helical plasma
Akihide Fujisawa,H. Iguchi,Takashi Minami,Yasuo Yoshimura,Kenji Tanaka,Kimitaka Itoh,H. Sanuki,S. Lee,M. Kojima,M. Kojima,Sanae I. Itoh,Masayuki Yokoyama,Shinichiro Kado,S. Okamura,R. Akiyama,Katsumi Ida,Mitsutaka Isobe,Seiya Nishimura,Masaki Osakabe,I. Nomura,Akihiro Shimizu,Chihiro Takahashi,Kazuo Toi,Keisuke Matsuoka,Yasuji Hamada,M. Fujiwara +25 more
TL;DR: In this paper, Matsuoka et al. studied the bifurcation nature of the electrostatic structure in the toroidal helical plasma of the Compact Helical System (CHS).
Local island divertor experiments on LHD
A. Komori,Nobuyoshi Ohyabu,Suguru Masuzaki,T. Morisaki,Hajime Suzuki,Chihiro Takahashi,Satoru Sakakibara,Kuniaki Watanabe,T. Minami,S. Morita,Kenji Tanaka,Satoshi Ohdachi,Shin Kubo,Nobuyuki Inoue,Hiroshi Yamada,Kiyohiko Nishimura,S. Okamura,Ken Matsuoka,O. Motojima,M. Fujiwara,A. Iiyoshi,C. Christopher Klepper,J. F. Lyon,A.C. England,D.E. Greenwood,Dongkyu Lee,D. R. Overbey,James A. Rome,D.E. Schechter,C.T. Wilson +29 more
TL;DR: In this article, a local island divertor (LID) experiment has been conducted on LHD, with the aims of controlling edge recycling and improving the plasma confinement, and the results of edge modeling using the EMC3-EIRENE code are also presented.
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Discovery of electric pulsation in a toroidal helical plasma
Akihide Fujisawa,H. Iguchi,Hiroshi Idei,Shin Kubo,Keisuke Matsuoka,S. Okamura,Kenji Tanaka,Takashi Minami,Satoshi Ohdachi,S. Morita,Hideki Zushi,S. Lee,Masaki Osakabe,R. Akiyama,Yasuo Yoshimura,Kazuo Toi,H. Sanuki,Kimitaka Itoh,Akihiro Shimizu,Shoji Takagi,Akira Ejiri,Chihiro Takahashi,Mamoru Kojima,S. Hidekuma,Katsumi Ida,Seiya Nishimura,Mitsutaka Isobe,N. Inoue,Ryuichi Sakamoto,Sanae I. Itoh,Yasuji Hamada,M. Fujiwara +31 more