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Hirano, Masashi; Yonomoto, Taisuke; Ishigaki, Masahiro; Watanabe, Norio; Maruyama, Yu; Shibamoto, Yasuteru; Watanabe, Tadashi; Moriyama, Kiyofumi
Journal of Nuclear Science and Technology, 49(1), p.1 - 17, 2012/01
Times Cited Count：97 Percentile：91.67(Nuclear Science & Technology)An unprecedented earthquake and tsunami struck the Fukushima Dai-ichi Nuclear Power Plants on 11 March 2011. Although extensive efforts have been continuing on investigations into the causes and consequences of the accident, and the Japanese Government has presented a comprehensive report on the accident in the IAEA Ministerial Conference held in June 2011, there is still much to be clarified on what happened during the accident and why. This article aims at identifying what should be clarified further about the progression of the accident at Units 1-3 through the review and analysis of information released from Tokyo Electric Power Company and government authorities. It also discusses the safety issues raised by the accident based on the insights gained, in order to contribute to establishing a new framework that pursues continuous improvement toward the highest standards of safety that can reasonably be achieved.
Kobayashi, Takayuki; Isayama, Akihiko; Yokokura, Kenji; Shimono, Mitsugu; Hasegawa, Koichi; Sawahata, Masayuki; Suzuki, Sadaaki; Terakado, Masayuki; Hiranai, Shinichi; Sato, Fumiaki; et al.
Nuclear Fusion, 51(10), p.103037_1 - 103037_10, 2011/10
Times Cited Count：19 Percentile：62.29(Physics, Fluids & Plasmas)A new gyrotron operation technique to increase oscillation efficiency was developed on the JT 60 ECRF system. The electron pitch factor was optimized by controlling anode voltage within 0.1 s after the start of the operation. By applying this technique, the gyrotron output power of 1.5 MW for 4 s was recorded, for the first time. The reduced collector heat load at 1.5 MW operations was reduced by 20% and it will be acceptable for longer pulse operation. A new gyrotron with an improved mode converter was developed in order to demonstrate reduction of the stray radiation which had limited the pulse length. The stray radiation was reduced to 1/3 of that of the original gyrotron. A conditioning operation of the improved gyrotron is proceeding up to 31 s at 1 MW. These progresses significantly contribute to enhancing the high power and long pulse capability of the ECRF system toward JT 60SA.
Taguchi, Mitsumasa; Moriyama, Masahiro*; Namba, Hideki; Hiratsuka, Hiroshi*
Radiation Physics and Chemistry, 64(2), p.115 - 122, 2002/05
Times Cited Count：4 Percentile：29.2(Chemistry, Physical)no abstracts in English
Taguchi, Mitsumasa; Hayano, Kazuki*; Xu, Y.; Moriyama, Masahiro*; Kobayashi, Yasuhiko; Hiratsuka, Hiroshi*; Ono, Shinichi*
Radiation Physics and Chemistry, 60(4-5), p.263 - 268, 2001/03
Times Cited Count：16 Percentile：73.13(Chemistry, Physical)no abstracts in English
Taguchi, Mitsumasa; Matsumoto, Yuichi*; Moriyama, Masahiro*; Namba, Hideki; Aoki, Yasushi; Hiratsuka, Hiroshi*
Radiation Physics and Chemistry, 58(2), p.123 - 129, 2000/04
Times Cited Count：6 Percentile：42.55(Chemistry, Physical)no abstracts in English
n eigenmodes, burst modes and chirping modes in the Alfvn frequency range driven by negative ion based neutral beam injection in JT-60UKusama, Yoshinori; Kramer, G. J.; Kimura, Haruyuki; Saigusa, Mikio*; Ozeki, Takahisa; Tobita, Kenji; Oikawa, Toshihiro; Shinohara, Koji; Kondoh, Takashi; Moriyama, Shinichi; et al.
Nuclear Fusion, 39(11Y), p.1837 - 1843, 1999/11
Times Cited Count：68 Percentile：87.25(Physics, Fluids & Plasmas)no abstracts in English
Taguchi, Mitsumasa; Xu, Y.; Kobayashi, Yasuhiko; Moriyama, Masahiro*; Hiratsuka, Hiroshi*
JAERI-Review 99-025, TIARA Annual Report 1998, p.25 - 27, 1999/10
no abstracts in English
Taguchi, Mitsumasa; Furukawa, Katsutoshi; Moriyama, Masahiro*; Ono, Shinichi*
JAERI-Review 99-025, TIARA Annual Report 1998, p.91 - 92, 1999/10
no abstracts in English
Ikeda, Yoshitaka; Fujita, Takaaki; Hamamatsu, Kiyotaka; Ide, Shunsuke; Imai, Tsuyoshi; Isayama, Akihiko; Iwase, Makoto; Kasugai, Atsushi; Kondoh, Takashi; Kusama, Yoshinori; et al.
AIP Conference Proceedings 485, p.279 - 287, 1999/09
no abstracts in English
Iwase, Makoto; Koide, Yoshihiko; Tobita, Kenji; Moriyama, Shinichi; Takenaga, Hidenobu; Fujita, Takaaki; Shirai, Hiroshi; Kusama, Yoshinori; Nemoto, Masahiro; Oikawa, Toshihiro; et al.
Proc. of 13th Topical Conf. on Applications of Radio Frequency Power to Plasmas, p.116 - 119, 1999/04
no abstracts in English
Kusama, Yoshinori; Kimura, Haruyuki; Nemoto, Masahiro; Hamamatsu, Kiyotaka; Tobita, Kenji; Oikawa, Toshihiro; Afanassiev, V. I.*; Morioka, Atsuhiko; Fujita, Takaaki; Koide, Yoshihiko; et al.
Plasma Physics and Controlled Fusion, 41(5), p.625 - 643, 1999/00
Times Cited Count：5 Percentile：20.1(Physics, Fluids & Plasmas)no abstracts in English
Kusama, Yoshinori; Fu, G. Y.*; Kramer, G. J.*; Saigusa, Mikio*; Oikawa, Toshihiro; Ozeki, Takahisa; Moriyama, Shinichi; Tchernychev, F. V.*; Nemoto, Masahiro; Kondoh, Takashi; et al.
Plasma Physics and Controlled Fusion, 41(9), p.1167 - 1177, 1999/00
Times Cited Count：5 Percentile：20.1(Physics, Fluids & Plasmas)no abstracts in English
n eigenmodes and their impact on plasma characteristics in JT-60UKusama, Yoshinori; Nazikian, R.*; Kramer, G. J.*; Kimura, Haruyuki; Saigusa, Mikio*; Ozeki, Takahisa; Fu, G. Y.*; Tobita, Kenji; Oikawa, Toshihiro; Shinohara, Koji; et al.
Fusion Energy 1998, 2, p.537 - 544, 1998/10
no abstracts in English
Kimura, Haruyuki; Kusama, Yoshinori; Saigusa, Mikio*; Kramer, G. J.*; Tobita, Kenji; Nemoto, Masahiro; Kondoh, Takashi; Nishitani, Takeo; O.DaCosta*; Ozeki, Takahisa; et al.
Nuclear Fusion, 38(9), p.1303 - 1314, 1998/09
Times Cited Count：126 Percentile：95.15(Physics, Fluids & Plasmas)no abstracts in English
Kusama, Yoshinori; Kimura, Haruyuki; Ozeki, Takahisa; Saigusa, Mikio*; Kramer, G. J.*; Oikawa, Toshihiro; Moriyama, Shinichi; Nemoto, Masahiro; Fujita, Takaaki; Tobita, Kenji; et al.
Nuclear Fusion, 38(8), p.1215 - 1223, 1998/08
Times Cited Count：41 Percentile：76.58(Physics, Fluids & Plasmas)no abstracts in English
Nemoto, Masahiro; Kusama, Yoshinori; Afanassiev, V. I.*; Hamamatsu, Kiyotaka; Kimura, Haruyuki; Fujii, Tsuneyuki; Moriyama, Shinichi; Saigusa, Mikio
Plasma Physics and Controlled Fusion, 39(10), p.1599 - 1614, 1997/10
Times Cited Count：8 Percentile：30.8(Physics, Fluids & Plasmas)no abstracts in English
and C
ions in fast proton neutralization in ICRF and combined ICRF/NBI-heated JT-60U plasmasAfanassiev, V. I.*; Kusama, Yoshinori; Nemoto, Masahiro; Kondoh, Takashi; Petrov, S. Y.*; Kozlovskij, S. S.*; Sato, Minoru; Morioka, Atsuhiko; Tsukahara, Yoshimitsu; Nishitani, Takeo; et al.
Plasma Physics and Controlled Fusion, 39(10), p.1509 - 1524, 1997/10
Times Cited Count：21 Percentile：58.77(Physics, Fluids & Plasmas)no abstracts in English
-ray measurements in JT-60UKondoh, Takashi; Kusama, Yoshinori; Kimura, Haruyuki; Saigusa, Mikio; Fujii, Tsuneyuki; Moriyama, Shinichi; Nemoto, Masahiro; Tobita, Kenji; Morioka, Atsuhiko; Nagashima, Keisuke; et al.
Journal of Nuclear Materials, 241-243, p.564 - 568, 1997/02
Times Cited Count：12 Percentile：67.87(Materials Science, Multidisciplinary)no abstracts in English
Tobita, Kenji; Nishitani, Takeo; Harano, Hideki*; Tani, Keiji; Isobe, Mitsutaka*; Fujita, Takaaki; Kusama, Yoshinori; G.A.Wurden*; Shirai, Hiroshi; Oikawa, Toshihiro; et al.
Fusion Energy 1996, Vol.1, p.497 - 505, 1997/00
no abstracts in English
Kimura, Haruyuki; Moriyama, Shinichi; Saigusa, Mikio; Kusama, Yoshinori; Ozeki, Takahisa; Kramer, G. J.*; Fujita, Takaaki; Oikawa, Toshihiro; Fujii, Tsuneyuki; Nemoto, Masahiro; et al.
Fusion Energy 1996, Vol.3, p.295 - 305, 1997/00
no abstracts in English
