Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Kenya Akaishi"'
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 26:321-327
Stainless-steel specimens (15×15×0.5mm3) containing homogeneously distributed tritium were used for the experiments. To investigate the fate of tritium in the surface region, about 70μm were chemically etched and the regrowth of tritium on the top
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc5f80ff4121f6423ddbf598d23ffe67
https://doi.org/10.1116/1.2889391
https://doi.org/10.1116/1.2889391
Autor:
Kenya Akaishi
Publikováno v:
Journal of Plasma and Fusion Research. 79:518-523
This article is a lecture on vacuum technique. The discussion matter is outgassing characteristics of water vapor and hydrogen in a vacuum chamber. The role of surface treatment of vacuum chamber is also mentioned from the view of reduction of outgas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a70991879e1251caa538e83a2757635
https://doi.org/10.1585/jspf.79.518
https://doi.org/10.1585/jspf.79.518
Publikováno v:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 20:848-856
To simulate hydrogen outgassing in an ultrahigh vacuum (UHV) chamber and a fusion device, an outgassing theory based on the recombination limited model is presented, where the time evolution of hydrogen concentration in the wall of the vacuum chamber
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f85b5f301251a8c4e618385c4082714
https://doi.org/10.1116/1.1471354
https://doi.org/10.1116/1.1471354
Autor:
Hideya Nakanishi, Masahiko Emoto, K.Y. Watanabe, N. Inoue, Ryuichi Sakamoto, Shin Kubo, S. Murakami, Tomo-Hiko Watanabe, Y. Zhao, Masayuki Yokoyama, Osamu Kaneko, Kenya Akaishi, Shinichiro Kado, Dirk Hartmann, Yuki Torii, Mamoru Shoji, Motoshi Goto, Hisamichi Funaba, Hiroshi Yamada, T. Kobuchi, Ryuhei Kumazawa, K. Nishimura, Katsumi Ida, M. Fujiwara, Ichihiro Yamada, T. Watari, Akio Komori, Shigeru Inagaki, Kazuo Toi, Katsunori Ikeda, Akio Sagara, J. Miyazawa, Hiroshi Idei, Osamu Motojima, M. Sato, T. Ozaki, Kazumichi Narihara, Yasuji Hamada, Kazuo Kawahata, A. V. Krasilnikov, Yasuo Yoshimura, Nobuyoshi Ohyabu, Yoshio Nagayama, N. Noda, Tomohiro Morisaki, Byron J. Peterson, Takashi Minami, Hajime Suzuki, S. Morita, N. Ashikawa, H. Sasao, Y. Nakamura, Kuninori Sato, Soichiro Yamaguchi, Satoshi Ohdachi, Kimitaka Itoh, P.C. De Vries, Mamiko Sasao, S. Yamamoto, Yasuhiko Takeiri, Satoru Sakakibara, Yoshihide Oka, Sadatsugu Muto, Masaki Osakabe, Shigeru Sudo, Mitsutaka Isobe, Kenji Saito, Tetsuo Seki, K. Yamazaki, Suguru Masuzaki, Fujio Shimpo, Tokihiko Tokuzawa, Takashi Mutoh, Kunizo Ohkubo, Katsuyoshi Tsumori, Kenji Tanaka, Goro Nomura, Atsushi Fukuyama, Mitsuhiro Yokota, Takashi Shimozuma
Publikováno v:
Nuclear Fusion. 41:1021-1035
The ICRF heating experiments conducted in 1999 in the third experimental campaign on LHD are reported, with an emphasis on the optimization of the heating regime. Specifically, an exhaustive study of seven different heating regimes was carried out by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae494fee058f5a056c24237b4611534b
https://doi.org/10.1088/0029-5515/41/8/306
https://doi.org/10.1088/0029-5515/41/8/306
Autor:
S. Tanahashi, Hiroshi Yamada, M. Fujiwara, Kazuo Kawahata, K. Saito, Naoko Ashikawa, Kazuo Toi, Kazuya Takahata, Hiroshi Idei, Hisamichi Funaba, Satoshi Ohdachi, Kimitaka Itoh, Kazumichi Narihara, S. Kitagawa, Yasuji Hamada, Y. Kubota, Masaki Osakabe, J. Miyazawa, Tokihiko Tokuzawa, Takashi Mutoh, Osamu Motojima, Ryuichi Sakamoto, Byron J. Peterson, Ichihiro Yamada, T. Watari, Masao Okamoto, Hideo Sugama, Nobuyoshi Ohyabu, Suguru Masuzaki, Shigeru Sudo, Sadao Satoh, Shigeru Inagaki, Shin Kubo, S. Murakami, Mitsutaka Isobe, Akio Sagara, K. Nishimura, Sadatsugu Muto, Y. Nakamura, K. Adachi, Hajime Suzuki, Masayuki Yokoyama, K. Yamazaki, Mamoru Shoji, Kunizo Ohkubo, Katsumi Ida, S. Yamamoto, Mamiko Sasao, Yoshio Nagayama, P. de Vries, S. Morita, Yasuhiko Takeiri, Motoshi Goto, Katsuyoshi Tsumori, A. Nishizawa, T. Kobuchi, Tomohiro Morisaki, Soichiro Yamaguchi, Keisuke Matsuoka, Satoru Sakakibara, Kenji Tanaka, Kenya Akaishi, Shinichiro Kado, Akio Komori, Ryuji Maekawa, M. Sato, K.Y. Watanabe, A. Nishimura, Toshiyuki Mito, T. Ozaki, Hideya Nakanishi, Masahiko Emoto, Masaki Takeuchi, Takashi Shimozuma, Yasuo Yoshimura, S. Yamada, Takashi Satow, A. Iwamoto, Hitoshi Tamura, Osamu Kaneko, Tetsuo Seki, K. Murai, Kuninori Sato, I. Ohtake, A. Iiyoshi, Nagato Yanagi, Tomo-Hiko Watanabe, Hirotaka Chikaraishi, Ryuhei Kumazawa, Katsunori Ikeda, Takashi Minami, Yoshihide Oka, Shinsaku Imagawa, N. Noda, H. Sasao
Publikováno v:
Nuclear Fusion. 40:1157-1166
The Large Helical Device is the world's largest heliotron type helical system, with the plasma confining magnetic field being generated by only external superconducting coils. One of the main objectives of the LHD project is to sustain high temperatu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c26b3c7cff6ecb010118b6e20f3185f
https://doi.org/10.1088/0029-5515/40/6/313
https://doi.org/10.1088/0029-5515/40/6/313
Autor:
Ryuhei Kumazawa, X. Jikang, Takashi Minami, Tokihiko Tokuzawa, Takashi Mutoh, Mamoru Shoji, Katsumi Ida, Hisamichi Funaba, Ichihiro Yamada, T. Watari, S. Morita, G. Nomura, Yoshihide Oka, Ryuichi Sakamoto, Kuninori Sato, Kunizo Ohkubo, Takashi Shimozuma, Shin Kubo, Katsuyoshi Tsumori, Yasuo Yoshimura, Kenji Tanaka, Suguru Masuzaki, Kazumichi Narihara, G. Cattanei, Fujio Shimpo, S. Murakami, Masaki Osakabe, Hajime Suzuki, Osamu Kaneko, Y. Nakamura, Tomo-Hiko Watanabe, Satoru Sakakibara, Akio Sagara, J. Miyazawa, Osamu Motojima, Shigeru Sudo, Hiroshi Yamada, Yasuhiko Takeiri, Mamiko Sasao, Nobuyoshi Ohyabu, M. Fujiwara, Sadatsugu Muto, K. Nishimura, Kazuo Toi, Kazuo Kawahata, Kenya Akaishi, Tomohiro Morisaki, Shinichiro Kado, Shigeru Inagaki, Akio Komori, T. Ozaki, M. Sato, K.Y. Watanabe, Yoshio Nagayama, K. Yamazaki, N. Noda, Hiroyuki Okada, Kenji Saito, H. Sasao, Tetsuo Seki, Satoshi Ohdachi, Hiroshi Idei, Motoshi Goto, Byron J. Peterson
Publikováno v:
Plasma Physics and Controlled Fusion. 42:265-274
The first experiment of the ion cyclotron range of frequencies (ICRF) heating in the Large Helical Device (LHD) was carried out at the end of 1998. The LHD is a large superconducting heliotron device and its first plasma was produced in March 1998. D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::feb12704520797fcd6d03c5eaf91cf9a
https://doi.org/10.1088/0741-3335/42/3/304
https://doi.org/10.1088/0741-3335/42/3/304
Autor:
Soichiro Yamaguchi, Nagato Yanagi, Hisamichi Funaba, Y. Kubota, Suguru Masuzaki, T. Kato, Satoru Sakakibara, M. Fujiwara, K. Yasui, Kenya Akaishi, Akio Sagara, T. Inoue, Hiroshi Yamada, Ryuichi Sakamoto, Kazuya Takahata, Mamoru Shoji, A. Iiyoshi, Y. Nakamura, Shinji Hamaguchi, J. Miyazawa, Akio Komori, I. Ohtake, Ryuji Maekawa, Osamu Motojima, N. Yamamoto, S. Kitagawa, Nobuyoshi Ohyabu, H. Ogawa, S. Moriuchi, Hajime Suzuki, H. Sekiguchi, Toshihiro Tsuzuki, S. Takami, S. Yamada, Takashi Satow, K. Ooba, Takuya Nagasaka, K. Murai, Takeo Muroga, A. Iwamoto, Hitoshi Tamura, K. Nishimura, S. Kato, H. Hayashi, Tomohiro Morisaki, T. Kondo, Y. Taniguchi, T. Baba, N. Suzuki, Shigeru Inagaki, Sadao Satoh, K.Y. Watanabe, H. Yonezu, M. Iima, A. Nishimura, N. Inoue, N. Noda, K. Yamazaki, Toshiyuki Mito, Hirotaka Chikaraishi, Shinsaku Imagawa
Publikováno v:
Nuclear Fusion. 40:599-609
In March 1998, the LHD project finally completed its eight year construction schedule. LHD is a superconducting (SC) heliotron type device with R = 3.9 m, ap = 0.6 m and B = 3 T, which has simple and continuous large helical coils. The major mission
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7883977ab26676a64add7caa23f46a23
https://doi.org/10.1088/0029-5515/40/3y/322
https://doi.org/10.1088/0029-5515/40/3y/322
Publikováno v:
Vacuum. 53:285-289
The effect of neon glow discharge cleaning (GDC) on the reduction of water outgassing and the production of ultrahigh vacuum was studied using a 304 stainless steel chamber. Two pumping systems having different effective pumping speeds of 10 l s-1 an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d439ef4f5cbad21bcdb13b05b70ac4d5
https://doi.org/10.1016/s0042-207x(98)00376-5
https://doi.org/10.1016/s0042-207x(98)00376-5
Publikováno v:
SHINKU. 42:204-207
The outgassing rates of an unbaked vacuum chamber were measured by the orifice pumping and the pressre rise methods. It was found that the measured outgassing rates were dependent on pumping speed. The change of residual gas composition in the test c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ca51223786d8bf01644dfd240079688
https://doi.org/10.3131/jvsj.42.204
https://doi.org/10.3131/jvsj.42.204
Autor:
Kenya Akaishi
Publikováno v:
SHINKU. 42:620-627
In order to consider the outgassing behavior in the pump-down of a vacuum system of a reversibly adsorbed phase, modeling of the pump-down based on the Temkin isotherm was attempted. In the modeling, two variables of relative surface coverage θ and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3002447b35b27e42d974de5f252db24c
https://doi.org/10.3131/jvsj.42.620
https://doi.org/10.3131/jvsj.42.620