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Doda, Norihiro; Uwaba, Tomoyuki; Yokoyama, Kenji; Nemoto, Toshiyuki*; Tanaka, Masaaki
Proceedings of 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19) (Internet), 14 Pages, 2022/03
In sodium-cooled fast reactors, reactivity feedback is generated by thermal deformation of the core fuel assembly during core temperature rise. To utilize the core deformation reactivity as an inherent safety characteristic and to eliminate excessive conservativeness of core design in the safety evaluation, an evaluation method by coupling analyses of neutronics, thermal-hydraulics, and structural deformation has been developed. An experiment of unprotected loss-of-flow event in the experimental fast breeder reactor EBR-II was analyzed. The analysis results show that the core deformation reactivity has a negative feedback effect, and that the deformation reactivity is affected not only by the fuel movement but also by the movement of reflectors around the fuel. As a result, the availability of the evaluation method for core deformation reactivity feedback by coupled analysis approach is confirmed.
Kurihara, Kenichi; Yonekawa, Izuru; Kawamata, Yoichi; Sueoka, Michiharu; Hosoyama, Hiroki*; Sakata, Shinya; Oshima, Takayuki; Sato, Minoru; Kiyono, Kimihiro; Ozeki, Takahisa
Fusion Engineering and Design, 81(15-17), p.1729 - 1734, 2006/07
Times Cited Count：13 Percentile：65.83(Nuclear Science & Technology)A large tokamak fusion device JT-60 is expected to explore more advanced tokamak discharge scenario towards the ITER and a future power reactor. We believe the following experimental issues are expected to be solved in JT-60. To clarify how to keep a steady-state plasma with high performance, and how to avoid plasma instabilities almost completely. By stimulus of this motivation, several essential development and modifications of plasma control and data acquisition systems have been performed in JT-60. In this report, we discuss the developments to improve the JT-60 plasma control and data acquisition systems. In addition, a future plasma control and data acquisition systems leading to a standard design for a power reactor is envisaged on the basis of the 20-year plasma operation experiences.
Kobayashi, Tetsuya; Chishiro, Etsuji; Suzuki, Hiroyuki*; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*; Kawamura, Masato*; Fukui, Yuji*; Fang, Z.*
Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.320 - 322, 2005/07
Total System of 324MHz-Low Level RF Control for J-PARC Linac was produced and its performance study was done. In this system, in order to stabilize the Klystron output and to compensate the linearity of that, an analog feedback control system is adopted. The response function including phase characteristic (vector locus) of this feedback system was obtained by means of measurement. From this result the prospect for the transient analysis is discussed.
Honda, Atsushi; Kawai, Mikito; Okano, Fuminori; Oshima, Katsumi*; Numazawa, Susumu*; Oga, Tokumichi; Ikeda, Yoshitaka
Heisei-16-Nendo Osaka Daigaku Sogo Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2005/03
no abstracts in English
Kurihara, Kenichi; JT-60 Team
Proceedings of 9th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2003) (CD-ROM), p.612 - 616, 2004/10
Since tokamak magnetic fusion research has just made a step forward to an international collaborative project ITER, the existing tokamaks including JT-60 are expected to explore more advanced operation scenarios toward the ITER and a future power reactor. Hence, we believe the following experimental issues are to be adequately discussed, and possibly to be solved in JT-60: To clarify how to keep a steady-state plasma with high performance, and how to avoid plasma instabilities almost completely. By stimulus of this motivation, the JT-60 plasma real-time control system has been drastically improved with remodeling in hardware as well as in software. In particular, several essential developments for exploring advanced scenarios have been accomplished or are being conducted. In the developments, we adopted the fast board computers' network linking through large reflective memories. Finally, in addition to presentation on plasma control engineering activities in JT-60, we would like to envisage a future plasma control system toward a power reactor.
Nagai, Ryoji; Sawamura, Masaru; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Nishitani, Tomohiro; Minehara, Eisuke
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.293 - 295, 2004/08
no abstracts in English
Kobayashi, Tetsuya; Chishiro, Etsuji; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.320 - 322, 2004/08
J-PARC (Japan Proton Accelerator Complex) linac, which is 300 m long, consists of 324 MHz accelerating section of the upstream and 972 MHz section (as future plan) of the downstream. In the klystron gallery, totally about 60 RF source control stations will stand for the klystrons and solid-state amplifiers. The error of the accelerating field must be within 
1 degree in phase and 1% in amplitude. Thus, the high phase stability is required to the RF reference for all of the low-level RF control systems and the beam monitor systems. This paper presents a final design and the summary of the performance evaluation of the RF reference distribution system including the timing control signal distribution for this linac.
Kobayashi, Tetsuya; Suzuki, Hiroyuki*; Anami, Shozo*; Yamaguchi, Seiya*; Kawamura, Masato*; Fukui, Yuji*; Kadokura, Eiichi*; Kamikubota, Norihiko*; Takagi, Makoto*; Yoshida, Susumu*; et al.
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.314 - 316, 2004/08
The beam study of the low-energy front of J-PARC linac has been in progress in the KEK site. Last year, DTL1 (the first tank of three DTL's) was installed in addition to RFQ and the Medium Energy Beam Transport line, and the beam commissioning up to 20MeV has been performed successfully. In this paper, the low level RF (LLRF) System for this beam test is summarized and the performance of the RF feed back control system and monitor system of the phase and amplitude of the accelerating fields (324 MHz) is presented. It was found that the feed back system for Bunchers is also necessary to stabilize and to compensate for the beam induced fields.
Uno, Sadanori; Tajima, Satoshi; Takada, Isao; Takayama, Terumitsu*; Koka, Masashi*; Moriya, Yoshinori*; Ebina, Tetsuya*
Dai-16-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.75 - 79, 2004/02
no abstracts in English
Sakamoto, Yoshiteru; Nakano, Tomohide; Oyama, Naoyuki
Purazuma, Kaku Yugo Gakkai-Shi, 79(7), p.715 - 716, 2003/07
no abstracts in English
Fukuda, Takeshi; Oikawa, Toshihiro; Takeji, Satoru; Isayama, Akihiko; Kawano, Yasunori; Neyatani, Yuzuru; Nagashima, Akira; Nishitani, Takeo; Konoshima, Shigeru; Tamai, Hiroshi; et al.
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.357 - 367, 2002/09
Times Cited Count：7 Percentile：44.35(Nuclear Science & Technology)no abstracts in English
Yanagisawa, Hiroshi; Ono, Akio
Journal of Nuclear Science and Technology, 39(1), p.76 - 81, 2002/01
Times Cited Count：3 Percentile：23.41(Nuclear Science & Technology)no abstracts in English
Obara, Toru*; Nakajima, Ken; Miyoshi, Yoshinori; Sekimoto, Hiroshi*
JAERI-Research 2001-037, 60 Pages, 2001/06
JAERI-Research-2001-037.pdf:2.7MB
no abstracts in English
Sakata, Shinya; Koiwa, Motonao*; Aoyagi, Tetsuo*; Matsuda, Toshiaki
Fusion Engineering and Design, 48(1-2), p.225 - 230, 2000/08
Times Cited Count：6 Percentile：42.66(Nuclear Science & Technology)no abstracts in English
Kumazawa, Shigeru
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 12 Pages, 2000/05
no abstracts in English
Oigawa, Hiroyuki; Iijima, Susumu; *
Journal of Nuclear Science and Technology, 36(10), p.902 - 913, 1999/10
Times Cited Count：2 Percentile：21.18(Nuclear Science & Technology)no abstracts in English
Sakai, Takuro; Sato, Takahiro*; Oikawa, Masakazu*; Kamiya, Tomihiro; Uno, Sadanori
Dai-12-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.97 - 99, 1999/07
no abstracts in English
Ishikawa, Nobuyuki; Suzuki, Katsuo
Nihon Genshiryoku Gakkai-Shi, 41(9), p.937 - 945, 1999/00
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Yamanishi, Toshihiko; Iwai, Yasunori; Nishi, Masataka; Yoshida, Hiroshi
Fusion Technology, 34(3), p.531 - 535, 1998/11
no abstracts in English
Moriyama, Shinichi; Kimura, Haruyuki; Fujii, Tsuneyuki; Yamamoto, Takumi; Saigusa, Mikio*
Japanese Journal of Applied Physics, Part 1, 37(11), p.6204 - 6209, 1998/11
Times Cited Count：3 Percentile：18.91(Physics, Applied)no abstracts in English
