H. Hojo
University of Tsukuba
11 Papers
149 Citations
H. Hojo is an academic researcher from University of Tsukuba. The author has contributed to research in topics: Ion & Electron. The author has an hindex of 7, co-authored 11 publications.
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Papers
X-ray studies of various shapes of electron-velocity distribution functions and of electron confinement affected by kilovolt-range electrostatic potentials
Teruji Cho,M. Hirata,E. Takahashi,K. Ogura,K. Masai,Naohiro Yamaguchi,T. Kondoh,K. Matsuda,H. Hojo,Masaaki Inutake,K. Ishii,Yasuhito Kiwamoto,Atsushi Mase,T. Saito,Kiyoshi Yatsu,S. Miyoshi +15 more
TL;DR: During experiments with thermal barriers, it has been observed that the bulk-electron temperature and its evolution with time in the central cell are quite different from the electron energy and its temporal evolution in the plug region, and this differences as well as the different shape of the electron-velocity distribution function in each region have clearly demonstrated the existence of a thermal-isolation effect due to the thermal barriers.
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Relaxation of pressure anisotropy due to Alfvén-ion-cyclotron fluctuations observed in ion-cyclotron-range-of-frequency-heated mirror plasmas.
Makoto Ichimura,Masaaki Inutake,Ryota Katsumata,N. Hino,H. Hojo,Kameo Ishii,Teruo Tamano,S. Miyoshi +7 more
TL;DR: Alfvenion-cyclotron modes are generated over a wide range of anisotropy parameter in ICRF-heated central cell plasmas of the GAMMA 10 tandem mirror.
Measurement of Alfvén ion‐cyclotron wave using both X‐ and O‐mode reflectometers
Atsushi Mase,Makoto Ichimura,H. Satake,Ryota Katsumata,Tokihiko Tokuzawa,Y. Ito,H. Hojo,E. J. Doyle,Akiyosi Itakura,Masaaki Inutake,Teruo Tamano +10 more
TL;DR: In this paper, the Fourier amplitude of the instability strongly depends on the anisotropy of the ion velocity distribution function and the plasma β value and the ratio 0.2-0.3 between O−mode and X−mode reflectometer signals suggests that a magnetic fluctuation level similar to the density fluctuation levels is excited in the plasma due to the instability.
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Observation of AIC-mode in ICRF-heated plasmas in the central cell of GAMMA 10 tandem mirror
Makoto Ichimura,Masaaki Inutake,Ryota Katsumata,N. Hino,H. Hojo,Kameo Ishii,Teruji Cho,M. Hirata,A Itakuta,Isao Katanuma,Yasuhito Kiwamoto,Atsushi Mase,Syoichi Miyoshi,Yousuke Nakashima,T. Saito,Teruo Tamano,Naohiro Yamaguchi,Kiyoshi Yatsu +17 more
TL;DR: Alfven ion-cyclotron modes are generated in an ICRF heated plasma in the central cell of the GAMMA 10 tandem mirror as discussed by the authors, and wave characteristics and its effects for the plasma parameters are described.
15
Recent diagnostic developments on LHD
Shigeru Sudo,Y. Nagayama,B.J. Peterson,Kazuo Kawahata,Tsuyoshi Akiyama,N. Ashikawa,M. Emoto,Motoshi Goto,Y. Hamada,Katsumi Ida,T. Ido,H. Iguchi,Shigeru Inagaki,Mitsutaka Isobe,T. Kobuchi,A. Komori,Yunfeng Liang,Suguru Masuzaki,T. Minami,Tomohiro Morisaki,S. Morita,Sadatsugu Muto,Y. Nakamura,Hideya Nakanishi,M Narushima,K. Narihara,Masaki Nishiura,A. Nishizawa,Satoshi Ohdachi,Masaki Osakabe,Tetsuo Ozaki,R. O. Pavlichenko,Satoru Sakakibara,Kuninori Sato,Mamoru Shoji,Naoki Tamura,Kenji Tanaka,K. Toi,T. Tokuzawa,K.Y. Watanabe,Tomo-Hiko Watanabe,Hiroshi Yamada,Ichihiro Yamada,Mikiro Yoshinuma,P. Goncharov,D. Kalinina,T Kanaba,T Sugimoto,Akira Ejiri,Yasushi Ono,H. Hojo,K. Ishii,N. Iwama,Yuichiro Kogi,Atsushi Mase,Mizuki Sakamoto,Katsumi Kondo,H Nagasaki,Satoshi Yamamoto,Nobuhiro Nishino,Shigeki Okajima,T. Saida,Mamiko Sasao,T Takeda,Shunji Tsuji-Iio,D. S. Darrow,H. Takahashi,Yong Liu,J. F. Lyon,A.Yu. Kostrioukov,V B Kuteev,Vladimir Yu. Sergeev,I. Viniar,A. V. Krasilnikov,Andrei Sanin,Leonid Vyacheslavov,Dan Stutman,Michael Finkenthal,O. Motojima +78 more
TL;DR: In this article, the authors developed two-dimensional diagnostics for steady-state plasma in the large helical device (LHD) through domestic and international collaborations, including tangential cameras (fast SX TV, photon counting CCD, Hα TV); tomography (tangential SX CCD); imaging (bolometer, ECE, reflectometer).