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Yoshino, Ryuji
Nuclear Fusion, 45(11), p.1232 - 1246, 2005/11
Times Cited Count：37 Percentile：74.07(Physics, Fluids & Plasmas)Prediction of major disruptions observed at the 
-limit for tokamak plasmas has been investigated in JT-60U with developing neural networks. A sub-neural network is trained to output a value of the 
limit every 2 ms. The target limit is artificially set by the operator in the first step training and is modified in the second step training using the output limit from the trained network. To improve the prediction performance further, the difference between the estimated limit and the measured and the other 11 parameters are inputted to a main neural network to calculate the stability level. Major disruptions have been predicted with a prediction success rate of 80% at 10 ms prior to the disruption while the false alarm rate is lower than 4%. This 80% is much higher than about 10% previously obtained. A prediction success rate of 90% has been also obtained with a false alarm rate of 12% at 10 ms prior to the disruption. This 12% is about a half of previously obtained one.
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.
Shimada, Michiya; Costley, A. E.*; Federici, G.*; Ioki, Kimihiro*; Kukushkin, A. S.*; Mukhovatov, V.*; Polevoi, A. R.*; Sugihara, Masayoshi
Journal of Nuclear Materials, 337-339, p.808 - 815, 2005/03
Times Cited Count：65 Percentile：96.35(Materials Science, Multidisciplinary)ITER is an experimental fusion reactor for investigation and demonstration of burning plasmas, characterised of its heating dominated by alpha-particle heating. ITER is a major step from present devices and an indispensable step for fusion reactor development. ITER's success largely depends on the control of plasma-wall interactions(PWI), with power and particle fluxes and time scales one or two orders of magnitude larger than in present devices. The strategy for control of PWI includes the semi-closed divertor, strong fuelling and pumping, disruption and ELM control, replaceable plasma-facing materials and stepwise operation.
Yoshino, Ryuji
Nuclear Fusion, 43(12), p.1771 - 1786, 2003/12
Times Cited Count：49 Percentile：79.65(Physics, Fluids & Plasmas)no abstracts in English
Abe, Tetsuya; Kanari, Moriyasu; Tanzawa, Sadamitsu; Hiroki, Seiji
JAERI-Tech 2002-093, 17 Pages, 2002/12
JAERI-Tech-2002-093.pdf:3.04MB
no abstracts in English
Yoshino, Ryuji
Purazuma, Kaku Yugo Gakkai-Shi, 75(12), p.1337 - 1374, 1999/12
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
Yoshino, Ryuji; Nakamura, Yukiharu; Neyatani, Yuzuru
Nuclear Fusion, 37(8), p.1161 - 1166, 1997/00
Times Cited Count：8 Percentile：30.9(Physics, Fluids & Plasmas)no abstracts in English
Koizumi, Koichi; Yamazaki, Kozo*
Purazuma, Kaku Yugo Gakkai-Shi, 72(12), p.1352 - 1361, 1996/12
no abstracts in English
*; Komatsuzaki, Manabu*; Nishio, Satoshi; Koizumi, Koichi; Takatsu, Hideyuki
JAERI-Tech 96-031, 16 Pages, 1996/07
no abstracts in English
Araki, Masanori; *
Review of Scientific Instruments, 67(1), p.178 - 184, 1996/01
Times Cited Count：4 Percentile：43.42(Instruments & Instrumentation)no abstracts in English
Yoshino, Ryuji; Nakamura, Yukiharu; Neyatani, Yuzuru
Nuclear Fusion, 36(3), p.295 - 307, 1996/00
Times Cited Count：35 Percentile：72.66(Physics, Fluids & Plasmas)no abstracts in English
Sato, Kazuyoshi; ; Araki, Masanori; Nakamura, Kazuyuki; Watanabe, Kazuhiro; ; Dairaku, Masayuki; Okumura, Yoshikazu; Ohara, Yoshihiro; Akiba, Masato
16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 1, p.220 - 223, 1995/00
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
Nishio, Satoshi; Miura, H.*; *
International Journal of Applied Electromagnetics and Mechanics, 6, p.37 - 54, 1995/00
no abstracts in English
Akiba, Masato; Madarame, Haruki*
Journal of Nuclear Materials, 212-215(1), p.90 - 96, 1994/09
no abstracts in English
Nishio, Satoshi; Abe, Tetsuya; *; Yamazaki, Seiichiro*
JAERI-Tech 94-006, 18 Pages, 1994/08
no abstracts in English
Iwamoto, Shuichi*; Ando, Toshinari
JAERI-M 93-071, 18 Pages, 1993/03
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
Akiba, Masato; Araki, Masanori; ; Ise, Hideo*; Nakamura, Kazuyuki; ; Dairaku, Masayuki; Tanaka, Shigeru
Journal of Nuclear Materials, 191-194, p.373 - 376, 1992/00
no abstracts in English
