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Wada, Yuki*; Enoto, Teruaki*; Nakazawa, Kazuhiro*; Furuta, Yoshihiro; Yuasa, Takayuki*; Nakamura, Yoshitaka*; Morimoto, Takeshi*; Matsumoto, Takahiro*; Makishima, Kazuo*; Tsuchiya, Harufumi
Physical Review Letters, 123(6), p.061103_1 - 061103_6, 2019/08
Times Cited Count：33 Percentile：88.25(Physics, Multidisciplinary)Matsuyama, Akinobu
Purazuma, Kaku Yugo Gakkai-Shi, 91(3), p.204 - 208, 2015/03
no abstracts in English
Nuga, Hideo; Matsuyama, Akinobu; Yagi, Masatoshi; Fukuyama, Atsushi*
Plasma and Fusion Research (Internet), 10, p.1203006_1 - 1203006_2, 2015/01
Kawano, Yasunori; Nakano, Tomohide; Isayama, Akihiko; Asakura, Nobuyuki; Tamai, Hiroshi; Kubo, Hirotaka; Takenaga, Hidenobu; Bakhtiari, M.; Ide, Shunsuke; Kondoh, Takashi; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 81(8), p.593 - 601, 2005/08
An experiment to investigate mitigation effects of impurity pellet injection on disruption generated runaway electrons was carried out in the JT-60U tokamak device. Deposition of impurity neon pellets into a post-disruption runaway plasma was observed with increment of bulk electron density. At the impurity pellet injection, decay time of runaway current became shorter as factor of 
2. There was an approximately linear relationship between changes in decay rate of runaway current and a photo-neutron signal which indicated loss of runaway electrons from the plasma. Consequently, enhanced loss of runaway electrons from a tokamak plasma, hence mitigation effect on them, by injection of impurity neon pellets was found.
Kawano, Yasunori
Denki Gakkai Gijutsu Hokoku, Dai-1018-Go, p.25 - 29, 2005/05
Aims of "The Investigation Committee on Pulsed Power Generation and Application" are to investigate recent developments on generation and control of pulsed power, to clarify the technological issues, and to provide the future prospects of such research area. This paper is written as the "section 3.3 Optical Diagnostics" in the technical report of the committee. Here, "diagnostics of relativistic electron beam in a torus plasma by laser inverse Compton scattering" is reported. This method has been newly proposed by JAERI for active measurement of the energy distribution of runaway electrons in a tokamak plasma. The paper presents the basic properties of scattered photons estimated in the case of runaway electron beam observed in JT-60U (number of beam electrons=2e17 electrons, beam electron energy = 30 MeV). For instance, when we use the fundamental YAG laser with the energy of 10 J/pulse and pulse widths of 1 ns, maximum energy of scattered photons would be in the X-ray region, and the signal to noise ratio can be estimated as 3. It is also mentioned that the development of the pulse X-ray imaging spectroscopy is required for this diagnostics method.
Kawano, Yasunori; Nakano, Tomohide; Isayama, Akihiko; Hatae, Takaki; Konoshima, Shigeru; Oyama, Naoyuki; Kondoh, Takashi; Tamai, Hiroshi; Kubo, Hirotaka; Asakura, Nobuyuki; et al.
Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00
In order to mitigate the post-disruption runaway electrons, experiments has been carried out with impurity pellet injection. As a result, we have observed the prompt exhaust of the runaway electrons and the reduction of runaway plasma. We have presented one possible explanation for basic behavior of the runaway plasma current that it follows the balance of the avalanche generation of runaway electrons and their slowing down predicted by the model, including effects by synchrotron radiation. On the other hand, standing on the fact that the current quench time is extended by runaway electrons, the experiment for avoiding the current quench by runaway electrons has been carried out. The runaway electrons reinforced the discharge to survive against the low Te of less than several tens eV and an additional impurity pellet injection, and thus the plasma current was maintained and terminated as programmed. To study the dynamics of runaway electrons precisely, a new active and direct diagnostic concept using the laser inverse Compton scattering has been proposed.
Bakhtiari, M.; Kawano, Yasunori; Tamai, Hiroshi; Miura, Yushi; Yoshino, Ryuji; Nishida, Yasushi*
Nuclear Fusion, 42(10), p.1197 - 1204, 2002/10
Times Cited Count：49 Percentile：80.12(Physics, Fluids & Plasmas)no abstracts in English
Kawano, Yasunori; Yoshino, Ryuji; Neyatani, Yuzuru; Nakamura, Yukiharu; Tokuda, Shinji; Tamai, Hiroshi
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.298 - 314, 2002/09
Times Cited Count：13 Percentile：63.36(Nuclear Science & Technology)no abstracts in English
Tamai, Hiroshi; Yoshino, Ryuji; Tokuda, Shinji; Kurita, Genichi; Neyatani, Yuzuru; Bakhtiari, M.; Khayratdinov, R. R.*; Lukash, V.*; Rosenbluth, M. N.*; JT-60 Team
Nuclear Fusion, 42(3), p.290 - 294, 2002/03
Times Cited Count：34 Percentile：70.69(Physics, Fluids & Plasmas)no abstracts in English
Yoshino, Ryuji; Tokuda, Shinji
Nuclear Fusion, 40(7), p.1293 - 1309, 2000/07
Times Cited Count：136 Percentile：95.56(Physics, Fluids & Plasmas)no abstracts in English
Ninomiya, Hiromasa; Tobita, Kenji; Schneider, U.*; Martin, G.*; Heidbrink, W. W.*; Kolesnichenko, Ya. I.*
Nuclear Fusion, 40(7), p.1287 - 1291, 2000/07
Times Cited Count：4 Percentile：80(Physics, Fluids & Plasmas)no abstracts in English
Ozeki, Takahisa; Iio, Shunji*; Yoshino, Ryuji; Shimada, Michiya; Fujisawa, Noboru; Ebisawa, Katsuyuki*; Ioki, Kimihiro*; Nakamura, Yukiharu; Tokuda, Shinji; Hayashi, Nobuhiko
Purazuma, Kaku Yugo Gakkai-Shi, 76(7), p.694 - 696, 2000/07
no abstracts in English
Department of Fusion Plasma Research
JAERI-Conf 2000-004, p.140 - 0, 2000/03
JAERI-Conf-2000-004.pdf:10.5MB
no abstracts in English
Yoshino, Ryuji; Ozeki, Takahisa; Tokuda, Shinji; Iio, Shunji*; Yamazaki, Kozo*
Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.116 - 126, 2000/02
no abstracts in English
Okano, Fuminori; Umino, Kazumi*
JAERI-Tech 99-070, p.19 - 0, 1999/09
no abstracts in English
Yoshino, Ryuji; Tokuda, Shinji; Kawano, Yasunori
Nuclear Fusion, 39(2), p.151 - 161, 1999/02
Times Cited Count：137 Percentile：95.53(Physics, Fluids & Plasmas)no abstracts in English
*; Hatano, Toshihisa; *; *; Miura, H.*; Kuroda, Toshimasa*; Furuya, Kazuyuki; Sato, Satoshi; Enoeda, Mikio; Takatsu, Hideyuki; et al.
JAERI-Tech 98-055, 97 Pages, 1998/12
no abstracts in English
Kawano, Yasunori; Yoshino, Ryuji; Neyatani, Yuzuru; Kondoh, Takashi; Isei, Nobuaki; Ishida, Shinichi; Tobita, Kenji; Hatae, Takaki; Itami, Kiyoshi; Sakasai, Akira; et al.
24th EPS Conf. on Controlled Fusion and Plasma Physics, 21A, p.501 - 504, 1997/00
no abstracts in English
Kawano, Yasunori; Yoshino, Ryuji; Neyatani, Yuzuru; Kondoh, Takashi; Isei, Nobuaki; Ishida, Shinichi; Tobita, Kenji; Hatae, Takaki; Itami, Kiyoshi; Sakasai, Akira; et al.
Fusion Energy 1996, Vol.1, p.345 - 357, 1997/00
no abstracts in English
Yoshino, Ryuji; Yamazaki, Kozo*; Tokuda, Shinji
Purazuma, Kaku Yugo Gakkai-Shi, 72(6), p.513 - 516, 1996/06
no abstracts in English
