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Journal Articles

Downward terrestrial gamma-ray flash observed in a winter thunderstorm

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:3 Percentile:25.77(Physics, Multidisciplinary)

Journal Articles

Chaos in runaway electron motion

Matsuyama, Akinobu

Purazuma, Kaku Yugo Gakkai-Shi, 91(3), p.204 - 208, 2015/03

no abstracts in English

Journal Articles

Fokker-Planck simulation of runaway electron generation in tokamak disruptions

Nuga, Hideo; Matsuyama, Akinobu; Yagi, Masatoshi; Fukuyama, Atsushi*

Plasma and Fusion Research (Internet), 10, p.1203006_1 - 1203006_2, 2015/01

Journal Articles

Characteristics of post-disruption runaway electrons with impurity pellet injection

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 $$sim$$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.

Journal Articles

Optical diagnostics

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 $$sim$$3. It is also mentioned that the development of the pulse X-ray imaging spectroscopy is required for this diagnostics method.

Journal Articles

Characteristics of runaway plasmas in JT-60U

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.

Journal Articles

Fast plasma shutdown scenarios in the JT-60U tokamak using intense mixed gas puffing

Bakhtiari, M.; Kawano, Yasunori; Tamai, Hiroshi; Miura, Yushi; Yoshino, Ryuji; Nishida, Yasushi*

Nuclear Fusion, 42(10), p.1197 - 1204, 2002/10

 Times Cited Count:43 Percentile:19.34(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Disruption studies in JT-60U

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:9 Percentile:45.27(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Runaway current termination in JT-60U

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:33 Percentile:26.55(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Runaway electrons in magnetic turbulence and runway current termination in discharges

Yoshino, Ryuji; Tokuda, Shinji

Nuclear Fusion, 40(7), p.1293 - 1309, 2000/07

 Times Cited Count:122 Percentile:4.25(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Energetic Particles in Magnetic Confinement Systems

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:3 Percentile:27.5(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Report on ITER Physics R&D Expert Group Meeting

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

JAEA Reports

Journal Articles

Results of ITER physics R&D, 4; Disruption, MHD and plasma control

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

JAEA Reports

Development of a multi-channel X-ray monitor system for the JFT-2M tokamak

Okano, Fuminori; Umino, Kazumi*

JAERI-Tech 99-070, p.19 - 0, 1999/09

JAERI-Tech-99-070.pdf:3.05MB

no abstracts in English

Journal Articles

Generation and termination of runaway electrons at major disruptions in JT-60U

Yoshino, Ryuji; Tokuda, Shinji; Kawano, Yasunori

Nuclear Fusion, 39(2), p.151 - 161, 1999/02

 Times Cited Count:129 Percentile:3.88(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Design & analysis of ITER shield blanket

*; Hatano, Toshihisa; *; *; Miura, H.*; Kuroda, Toshimasa*; Furuya, Kazuyuki; Sato, Satoshi; Enoeda, Mikio; Takatsu, Hideyuki; et al.

JAERI-Tech 98-055, 97 Pages, 1998/12

JAERI-Tech-98-055.pdf:3.16MB

no abstracts in English

Journal Articles

Suppression of runaway-electrons generation during desruptive discharge-terminations in JT-60U

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

Journal Articles

Fast current shutdown scenario for major disruption softening in JT-60U

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

Journal Articles

Present status and future plan of ITER physics R&D expert group,4; Disruption, plasma control and MHD

Yoshino, Ryuji; Yamazaki, Kozo*; Tokuda, Shinji

Purazuma, Kaku Yugo Gakkai-Shi, 72(6), p.513 - 516, 1996/06

no abstracts in English

41 (Records 1-20 displayed on this page)