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Journal Articles

Ripple reduction with ferritic insert in JFT-2M

Shinohara, Koji; Sato, Masayasu; Kawashima, Hisato; Tsuzuki, Kazuhiro; Suzuki, Sadaaki; Urata, Kazuhiro*; Isei, Nobuaki; Tani, Takashi; Kikuchi, Kazuo; Shibata, Takatoshi; et al.

Fusion Science and Technology, 49(2), p.187 - 196, 2006/02

 Times Cited Count:7 Percentile:50.82(Nuclear Science & Technology)

In JFT-2M, the toroidal field ripple was reduced by ferritic insert. Two kinds of ripple reduction were carried out. In the first case, ferritic steel was installed between toroidal field coil and vacuum vessel, just under toroidal field coil, outside vacuum vessel. In the second one, ferritic steel was installed inside vacuum vessel covering almost whole inside wall. The ripple was successfully reduced in the both cases. The temperature increment on the first wall measured by infrared TV was also reduced. A new version of OFMC code was also developed to analyze fast ion behavior in the complex structure of the toroidal field. The TF ripple reduction with ferritic insert in JFT-2M is summarized in this article.

Journal Articles

Characteristics of plasma operation with the ferritic inside wall and its compatibility with high-performance plasmas in JFT-2M

Tsuzuki, Kazuhiro*; Kimura, Haruyuki; Kusama, Yoshinori; Sato, Masayasu; Kawashima, Hisato; Kamiya, Kensaku; Shinohara, Koji; Ogawa, Hiroaki; Uehara, Kazuya; Kurita, Genichi; et al.

Fusion Science and Technology, 49(2), p.197 - 208, 2006/02

 Times Cited Count:11 Percentile:35.19(Nuclear Science & Technology)

no abstracts in English

Journal Articles

High performance tokamak experiments with a ferritic steel wall on JFT-2M

Tsuzuki, Kazuhiro; Kimura, Haruyuki; Kawashima, Hisato; Sato, Masayasu; Kamiya, Kensaku; Shinohara, Koji; Ogawa, Hiroaki; Hoshino, Katsumichi; Bakhtiari, M.; Kasai, Satoshi; et al.

Nuclear Fusion, 43(10), p.1288 - 1293, 2003/10

 Times Cited Count:38 Percentile:24.34(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Maximum entropy estimation of electron cyclotron emission spectra from incomplete interferograms in ELMy H-mode tokamak experiment

Isayama, Akihiko; Iwama, Naofumi*; Showa, Takeshi*; Hosoda, Yosuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu

Japanese Journal of Applied Physics, Part 1, 42(9A), p.5787 - 5796, 2003/09

 Times Cited Count:3 Percentile:83.53(Physics, Applied)

no abstracts in English

Journal Articles

Singular value decomposition analysis of multichannel electron cyclotron emission signals of tokamak plasma

Isayama, Akihiko; Iwama, Naofumi*; Hosoda, Yosuke*; Satake, Shinsuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu

Japanese Journal of Applied Physics, Part 2, 42(3), p.L329 - L331, 2003/03

 Times Cited Count:2 Percentile:88.59(Physics, Applied)

no abstracts in English

Journal Articles

Recent activities on the compatibility of the ferritic steel wall with the plasma in the JFT-2M tokamak

Tsuzuki, Kazuhiro; Sato, Masayasu; Kawashima, Hisato; Isei, Nobuaki; Kimura, Haruyuki; Ogawa, Hiroaki; Miyachi, Kengo; Yamamoto, Masahiro; Shibata, Takatoshi

Journal of Nuclear Materials, 307-311(Part2), p.1386 - 1390, 2002/12

 Times Cited Count:14 Percentile:31.59(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Dynamics of plasma during the formation of a weak negative central magnetic shear configuration using counter neutral beam injection in the JFT-2M tokamak

Kamiya, Kensaku; Kimura, Haruyuki; Ogawa, Hiroaki; Kawashima, Hisato; Tsuzuki, Kazuhiro; Isei, Nobuaki; Sato, Masayasu; Shinohara, Koji

Purazuma, Kaku Yugo Gakkai-Shi, 78(12), p.1361 - 1367, 2002/12

no abstracts in English

Journal Articles

Diagnostics system of JT-60U

Sugie, Tatsuo; Hatae, Takaki; Koide, Yoshihiko; Fujita, Takaaki; Kusama, Yoshinori; Nishitani, Takeo; Isayama, Akihiko; Sato, Masayasu; Shinohara, Koji; Asakura, Nobuyuki; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.482 - 511, 2002/09

 Times Cited Count:6 Percentile:96.97(Nuclear Science & Technology)

The diagnostic system of JT-60U (JT-60upgrade) is composed of about 50 individual diagnostic devices. Recently, the detailed radial profile measurements of plasma parameters have been improved, so that the internal structure of plasmas has been explored. The understanding of plasma confinement has been enhanced by density and temperature fluctuation measurements using a mm-wave reflectometer and electron cyclotron emission measurements respectively. In addition, the real-time control experiments of electron density, neutron yield, radiated power and electron temperature gradient have been carried out successfully by corresponding diagnostic devices. These measurements and the real time control contribute to improving plasma performance. Diagnostic devices for next generation fusion devices such as a CO2 laser interferometer/polarimeter and a CO2 laser collective Thomson scattering system have been developed.

Journal Articles

Investigation on ripple loss reduction by ferritic steel plate insertion in JFT-2M; Comparison between experimental and computational data

Sato, Masayasu; Kimura, Haruyuki; Miura, Yukitoshi; Nakayama, Takeshi*; Tobita, Kenji; Kawashima, Hisato; Tsuzuki, Kazuhiro; Isei, Nobuaki

Nuclear Fusion, 42(8), p.1008 - 1013, 2002/08

 Times Cited Count:4 Percentile:84.05(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Research activities on Tokamaks in Japan; JT-60U, JFT-2M and TRIAM-1M

Ninomiya, Hiromasa; Kitsunezaki, Akio; Shimizu, Masatsugu; Kuriyama, Masaaki; JT-60 Team; Kimura, Haruyuki; Kawashima, Hisato; Tsuzuki, Kazuhiro; Sato, Masayasu; Isei, Nobuaki; et al.

Fusion Science and Technology, 42(1), p.7 - 31, 2002/07

 Times Cited Count:12 Percentile:75.76(Nuclear Science & Technology)

In order to establish scientific basis for the sustainment of highly integrated performance required in the advanced steady-state operation, JT-60U has been optimizing the discharge control scenarios of improved confinement plasmas and expanding the operation regions. Promising results toward the steady-state tokamak were obtained. The detail of such results is reported. JFT-2M has performed advanced and basic research for the development of high performance tokamak plasma as well as the structural material for a fusion reactor. The toroidal ripple reduction with ferritic steel plates outside the vacuum vessel was successfully demonstrated. No adverse effects were observed in the pre-testing on compatibility between ferritic steel plates, covering ~20% of the inside wall of the vacuum vessel, and plasma. The results of TRIAM-1M is also reported.

Journal Articles

Testing for compatibility of reduced activation ferritic steel with plasma on JFT-2M; Partial coverage of the vacuum vessel with ferritic steel

Tsuzuki, Kazuhiro; Isei, Nobuaki; Kawashima, Hisato; Sato, Masayasu; Kimura, Haruyuki; Ogawa, Hiroaki; Miura, Yukitoshi; Ogawa, Toshihide; Shibata, Takatoshi; Akiyama, Takashi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.455 - 461, 2002/05

no abstracts in English

Journal Articles

A 20-channel electron cyclotron emission detection system for a grating polychromator in JT-60U

Isayama, Akihiko; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu

Review of Scientific Instruments, 73(3), p.1165 - 1168, 2002/03

 Times Cited Count:9 Percentile:50.18(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Advanced material tokamak experiment (AMTEX) on JFT-2M; Design, fabrication, installation and conditioning of inside ferritic steel wall

Shibata, Takatoshi; Akiyama, Takashi*; Isei, Nobuaki; Kawashima, Hisato; Kimura, Haruyuki; Miyachi, Kengo; Okano, Fuminori; Sato, Masayasu; Suzuki, Sadaaki; Tsuzuki, Kazuhiro; et al.

Proceedings of 19th IEEE/NPSS Symposium on Fusion Engineering (SOFE), p.360 - 363, 2002/00

no abstracts in English

Journal Articles

Electron cyclotron emission measurements in JT-60U

Isei, Nobuaki; Isayama, Akihiko; Ishida, Shinichi; Sato, Masayasu; Oikawa, Toshihiro; Fukuda, Takeshi; Nagashima, Akira; Iwama, Naofumi*; JT-60 Team

Fusion Engineering and Design, 53(1-4), p.213 - 220, 2001/11

 Times Cited Count:16 Percentile:24.3

no abstracts in English

Journal Articles

Progress of advanced material tokamak experiment (AMTEX) program on JFT-2M

Kimura, Haruyuki; Sato, Masayasu; Kawashima, Hisato; Isei, Nobuaki; Tsuzuki, Kazuhiro; Ogawa, Hiroaki; Ogawa, Toshihide; Miura, Yukitoshi; Yamamoto, Masahiro; Shibata, Takatoshi; et al.

Fusion Engineering and Design, 56-57, p.837 - 841, 2001/10

 Times Cited Count:14 Percentile:28.08(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Multichannel motional stark effect diagnostic discriminating radial electric field in the JFT-2M tokamak

Kamiya, Kensaku; Kimura, Haruyuki; Hoshino, Katsumichi; Isei, Nobuaki; Kawashima, Hisato; Ogawa, Hiroaki; Ogawa, Toshihide; Tsuzuki, Kazuhiro; Uehara, Kazuya; JFT-2M Group

Review of Scientific Instruments, 72(7), p.2931 - 2935, 2001/07

 Times Cited Count:6 Percentile:58.24(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Long sustainment of quasi-steady-state high $$beta_{p}$$ H-mode discharges in JT-60U

Isayama, Akihiko; Kamada, Yutaka; Ozeki, Takahisa; Ide, Shunsuke; Fujita, Takaaki; Oikawa, Toshihiro; Suzuki, Takahiro; Neyatani, Yuzuru; Isei, Nobuaki; Hamamatsu, Kiyotaka; et al.

Nuclear Fusion, 41(6), p.761 - 768, 2001/06

 Times Cited Count:49 Percentile:17.46(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Application of low activation ferritic steel in the JFT-2M tokamak; Evaluation of magnetic effect to the plasma

Isei, Nobuaki; Sato, Masayasu; Tsuzuki, Kazuhiro; Kawashima, Hisato; Miura, Yukitoshi; Kimura, Haruyuki; JFT-2M Group

Fusion Technology, 39(Part2), p.1101 - 1105, 2001/03

no abstracts in English

Journal Articles

Demonstration of ripple reduction by ferritic steel board insertion in JFT-2M

Kawashima, Hisato; Sato, Masayasu; Tsuzuki, Kazuhiro; Miura, Yukitoshi; Isei, Nobuaki; Kimura, Haruyuki; Nakayama, Takeshi*; Abe, Mitsushi*; Darrow, D. S.*; JFT-2M Group

Nuclear Fusion, 41(3), p.257 - 263, 2001/03

 Times Cited Count:35 Percentile:26.01(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Electron temperature perturbations measured by electron cyclotron emission diagnostic systems in JT-60U

Isayama, Akihiko; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu; Kamada, Yutaka; Ide, Shunsuke; Ikeda, Yoshitaka; Takahashi, Koji; Kajiwara, Ken; Hamamatsu, Kiyotaka; et al.

Fusion Engineering and Design, 53(1-4), p.129 - 135, 2001/01

 Times Cited Count:10 Percentile:38.29(Nuclear Science & Technology)

no abstracts in English

67 (Records 1-20 displayed on this page)