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Kawano, Yasunori; Nakano, Tomohide; Asakura, Nobuyuki; Tamai, Hiroshi; Isayama, Akihiko; Kondoh, Takashi; Hatae, Takaki; Takenaga, Hidenobu; Ide, Shunsuke
Purazuma, Kaku Yugo Gakkai-Shi, 81(10), p.743 - 744, 2005/10
Electron density of post-disruption runaway plasmas in JT-60U has been measured by the tangential CO
laser interferometer. Increases in electron density after the first drop of runaway plasma current have been observed during a fast termination phase of the runaway plasma. At the second current drop, an increase in electron density with multiple spikes or oscillation with the period of 1 ms has been found. It is suggested that the increased electron density seems to take part in the shorter current decay time after the second current drop.
Bakhtiari, M.; Kramer, G. J.*; Takechi, Manabu; Tamai, Hiroshi; Miura, Yukitoshi; Kusama, Yoshinori; Kamada, Yutaka
Physical Review Letters, 94(21), p.215003_1 - 215003_4, 2005/06
Times Cited Count：45 Percentile：82.81(Physics, Multidisciplinary)Bremsstrahlung radiation of runaway electrons is found to be an energy limit for runaway electrons in tokamaks. The minimum and maximum energy of runaway electron beams is shown to be limited by collisions and Bremsstrahlung radiation, respectively. It is also found that a massive injection of a high-Z gas such as Xenon can terminate a disruption-generated runaway current before the runaway electrons hit the walls.
Bakhtiari, M.; Tamai, Hiroshi; Kawano, Yasunori; Kramer, G. J.*; Isayama, Akihiko; Nakano, Tomohide; Kamiya, Kensaku; Yoshino, Ryuji; Miura, Yukitoshi; Kusama, Yoshinori; et al.
Nuclear Fusion, 45(5), p.318 - 325, 2005/05
Times Cited Count：45 Percentile：78.65(Physics, Fluids & Plasmas)In the previous works we had shown that injecting a mixture of large amounts of hydrogen and small amounts of argon can terminate a tokamak discharge quickly with avoiding runaway electron generation. In this work we have done the same experiments but with different gases in addition to argon. In fact we compared the effect of the puffing of argon, krypton, and xenon gases with and without simultaneous hydrogen gas puffing on disruption mitigation. We observed that injecting all impurities in the form of an admixture in hydrogen lead to faster plasma shutdowns with less runaway electron generation. We also found that injecting krypton gas (with or without hydrogen) seems to be a good candidate for plasma shutdown purposes since it induces low heat flux to divertor plates and avoids runaway electron generation more effectively.
Bakhtiari, M.; Yoshino, Ryuji; Nishida, Yasushi*
Fusion Science and Technology, 41(2), p.77 - 87, 2002/03
Times Cited Count：6 Percentile：39.54(Nuclear Science & Technology)no abstracts in English
Tokuda, Shinji; Higuchi, Takatoshi*; Suzuki, Noriyuki*
Purazuma, Kaku Yugo Gakkai-Shi, 77(12), p.1180 - 1220, 2001/12
no abstracts in English
Yoshino, Ryuji; D.J.Campbell*; E.Fredrickson*; Fujisawa, Noboru; N.Granetz*; Gruber, O.*; T.C.Hender*; D.A.Humphreys*; N.Ivanov*; S.Jardin*; et al.
Fusion Energy 2000 (CD-ROM), 4 Pages, 2001/05
no abstracts in English
Tokuda, Shinji; Yoshino, Ryuji
Nuclear Fusion, 39(9), p.1123 - 1132, 1999/09
Times Cited Count：21 Percentile：56.38(Physics, Fluids & Plasmas)no abstracts in English
ITER Physics Expert Group on Disruptions, Plasma Control, and MHD
Nuclear Fusion, 39(12), p.2251 - 2389, 1999/00
no abstracts in English
*; ; Kunugi, Tomoaki*; Akiba, Masato
JAERI-Research 98-033, 35 Pages, 1998/07
JAERI-Research-98-033.pdf:1.37MB
no abstracts in English
Yoshino, Ryuji; Kondoh, Takashi; Neyatani, Yuzuru; Itami, Kiyoshi; Kawano, Yasunori; Isei, Nobuaki
Plasma Physics and Controlled Fusion, 39(2), p.313 - 332, 1997/02
Times Cited Count：99 Percentile：93.13(Physics, Fluids & Plasmas)no abstracts in English
) plasma-current start-up in JT-60UYoshino, Ryuji; Seki, Masami
Plasma Physics and Controlled Fusion, 39(1), p.205 - 222, 1997/01
Times Cited Count：38 Percentile：75.07(Physics, Fluids & Plasmas)no abstracts in English
Yoshino, Ryuji; JT-60 Team
Proc. of 36th IEEE Conf. on Decision and Control, 4, p.3709 - 3714, 1997/00
no abstracts in English
Yoshino, Ryuji; Neyatani, Yuzuru; Isei, Nobuaki; Koide, Yoshihiko; Kawano, Yasunori; A.Tanga*; Campbell, D. J.*; M.F.Johnson*; L.Rossi*
IAEA-CN-60/A5-8, 0, p.685 - 695, 1995/00
no abstracts in English
H.-W.Bartels*; Kunugi, Tomoaki; A.J.Russo*
Atomic and Plasma-Material Interaction Data for Fusion, Vol. 5, 0, p.225 - 244, 1994/00
no abstracts in English
Kunugi, Tomoaki
Fusion Engineering and Design, 23, p.329 - 339, 1993/00
Times Cited Count：5 Percentile：47.66(Nuclear Science & Technology)no abstracts in English
Yoshino, Ryuji; Neyatani, Yuzuru; Hosogane, Nobuyuki; S.W.Wolfe*; Matsukawa, Makoto; Ninomiya, Hiromasa
Nuclear Fusion, 33(11), p.1599 - 1612, 1993/00
Times Cited Count：34 Percentile：71.57(Physics, Fluids & Plasmas)no abstracts in English
Kunugi, Tomoaki; Akiba, Masato; Ogawa, Masuro; *; *
KEK-PROC-92-16, p.56 - 63, 1992/12
no abstracts in English
Kunugi, Tomoaki; Akiba, Masato; Ogawa, Masuro; *; *
Fusion Technology, 21, p.1868 - 1872, 1992/05
no abstracts in English
; ; ; ; Sengoku, Seio; ; ; Matsumoto, Hiroshi; ;
Journal of the Physical Society of Japan, 48(3), p.1053 - 1054, 1980/00
Times Cited Count：7 Percentile：67.37(Physics, Multidisciplinary)no abstracts in English
