S
Shigeki Okajima
Researcher at Chubu University
Publications - 122
Citations - 1279
Shigeki Okajima is an academic researcher from Chubu University. The author has contributed to research in topics: Laser & Interferometry. The author has an hindex of 19, co-authored 122 publications receiving 1211 citations. Previous affiliations of Shigeki Okajima include University College of Engineering.
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Journal ArticleDOI
Far infrared laser interferometer system on the Large Helical Device
TL;DR: A multichannel far-infrared laser interferometer system has been developed for the measurement of the spatial and temporal behaviors of the electron density on the Large Helical Device (LHD) at the National Institute for Fusion Science.
Journal ArticleDOI
Experimental study of particle transport and density fluctuations in LHD
Kenji Tanaka,Clive Michael,Andrei Sanin,Leonid Vyacheslavov,Kazuo Kawahata,Sadayoshi Murakami,A. Wakasa,Shigeki Okajima,Hiroshi Yamada,Mamoru Shoji,J. Miyazawa,S. Morita,T. Tokuzawa,Tsuyoshi Akiyama,Motoshi Goto,Katsumi Ida,Mikiro Yoshinuma,Ichihiro Yamada,Masayuki Yokoyama,Suguru Masuzaki,Tomohiro Morisaki,Ryuichi Sakamoto,H. Funaba,Shigeru Inagaki,Makoto I. Kobayashi,A. Komori +25 more
TL;DR: In this article, the particle transport coefficients, i.e. diffusion coefficient (D) and convection velocity (V), were obtained in the standard configuration from density modulation experiments.
Journal ArticleDOI
Overview of LHD experiments
M. Fujiwara,Kazuo Kawahata,Nobuyoshi Ohyabu,Osamu Kaneko,Akio Komori,Hiroshi Yamada,N. Ashikawa,Larry R. Baylor,S.K. Combs,P. deVries,Masahiko Emoto,Akira Ejiri,P. W. Fisher,Hisamichi Funaba,Motoshi Goto,Dirk Hartmann,Katsumi Ida,Hiroshi Idei,S. Iio,Katsunori Ikeda,Shigeru Inagaki,N. Inoue,Mitsutaka Isobe,Shinichiro Kado,K. V. Khlopenkov,T. Kobuchi,A. V. Krasilnikov,Shin Kubo,Ryuhei Kumazawa,F. Leuterer,Y. Liang,J. F. Lyon,Suguru Masuzaki,Takashi Minami,J. Miyajima,Tomohiro Morisaki,S. Morita,S. Murakami,Sadatsugu Muto,Takashi Mutoh,Yoshio Nagayama,Noriyoshi Nakajima,Y. Nakamura,Hideya Nakanishi,Kazumichi Narihara,K. Nishimura,N. Noda,Takashi Notake,Satoshi Ohdachi,Yoshihide Oka,Shigeki Okajima,Masao Okamoto,Masaki Osakabe,T. Ozaki,R. O. Pavlichenko,Byron J. Peterson,Akio Sagara,Kenji Saito,Satoru Sakakibara,Ryuichi Sakamoto,H. Sanuki,H. Sasao,Mamiko Sasao,Kuninori Sato,M. Sato,Tetsuo Seki,Takashi Shimozuma,Mamoru Shoji,Hideo Sugama,Hajime Suzuki,M. Takechi,Yasuhiko Takeiri,Naoki Tamura,Kenji Tanaka,Kazuo Toi,Tokihiko Tokuzawa,Yuki Torii,Katsuyoshi Tsumori,K.Y. Watanabe,Tsuguhiro Watanabe,T. Watari,Ichihiro Yamada,Soichiro Yamaguchi,S. Yamamoto,Masayuki Yokoyama,Naoaki Yoshida,Yasuo Yoshimura,Y. Zhao,R. Akiyama,K. Haba,M. Iima,J. Kodaira,T. Takita,Toshihiro Tsuzuki,K. Yamauchi,H. Yonezu,Hirotaka Chikaraishi,Shinji Hamaguchi,Shinsaku Imagawa,A. Iwamoto,S. Kitagawa,Y. Kubota,Ryuji Maekawa,Toshiyuki Mito,K. Murai,A. Nishimura,Kazuya Takahata,Hitoshi Tamura,S. Yamada,Nagato Yanagi,Kimitaka Itoh,Keisuke Matsuoka,Kunizo Ohkubo,I. Ohtake,Sadao Satoh,Takashi Satow,Shigeru Sudo,S. Tanahashi,K. Yamazaki,Yasuji Hamada,Osamu Motojima +120 more
TL;DR: In the first two years of the LHD experiment, the following results have been achieved: (i) higher Te (Te(0) = 4.4 KV at ne = 5.3 KV, Te( 0) = 1.1 KV and Pabs = 2.0 KV.
Journal ArticleDOI
Two-dimensional phase contrast imaging for local turbulence measurements in large helical device (invited).
K. A. Tanaka,Clive Michael,Leonid Vyacheslavov,Andrei Sanin,Kazuo Kawahata,T. Akiyama,T. Tokuzawa,Shigeki Okajima +7 more
TL;DR: Two-dimensional phase contrast imaging installed on the large helical device (LHD) is a unique diagnostic for local turbulence measurements and the 2D k-spectrum, a fluctuation profile over almost the entire plasma diameter can be obtained at a single moment.
Journal ArticleDOI
Overview of confinement and MHD stability in the Large Helical Device
O. Motojima,Katsumi Ida,K.Y. Watanabe,Y. Nagayama,A. Komori,Tomohiro Morisaki,B.J. Peterson,Y. Takeiri,Kunizo Ohkubo,Kenji Tanaka,Takashi Shimozuma,Shigeru Inagaki,T. Kobuchi,Satoru Sakakibara,J. Miyazawa,Hiroshi Yamada,Nobuyoshi Ohyabu,K. Narihara,K. Nishimura,Mikiro Yoshinuma,S. Morita,Tsuyoshi Akiyama,N. Ashikawa,C. D. Beidler,M. Emoto,Takaaki Fujita,T. Fukuda,H. Funaba,P. R. Goncharov,Motoshi Goto,T. Ido,Katsunori Ikeda,Akihiko Isayama,Mitsutaka Isobe,Hiroe Igami,K. Ishii,Kimitaka Itoh,Osamu Kaneko,Kazuo Kawahata,H. Kawazome,Shin Kubo,Ryuhei Kumazawa,Suguru Masuzaki,K. Matsuoka,T. Minami,Sadayoshi Murakami,Sadatsugu Muto,Takashi Mutoh,Y. Nakamura,Hideya Nakanishi,Y. Narushima,Masaki Nishiura,A. Nishizawa,N. Noda,Takashi Notake,H. Nozato,Satoshi Ohdachi,Yoshihide Oka,Shigeki Okajima,Masaki Osakabe,T. Ozaki,Akio Sagara,T. Saida,K. Saito,Mizuki Sakamoto,Ryuichi Sakamoto,Yoshiteru Sakamoto,Mamiko Sasao,Kuninori Sato,Masahide Sato,Tetsuo Seki,Mamoru Shoji,S. Sudo,N. Takeuchi,Hidenobu Takenaga,Naoki Tamura,K. Toi,T. Tokuzawa,Yuki Torii,Katsuyoshi Tsumori,T. Uda,A. Wakasa,T. Watari,Ichihiro Yamada,Satoshi Yamamoto,K. Yamazaki,Masayuki Yokoyama,Yasuo Yoshimura +87 more
TL;DR: The Large Helical Device (LHD) as mentioned in this paper is a heliotron device with L = 2 and M = 10 continuous helical coils with a major radius of 3.5-4.1 m, a minor radius of 0.6 m and a toroidal magnetic confinement system for a steady state thermonuclear fusion reactor.