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Journal Articles

Investigation for tiny metal contamination of water cooling system in J-PARC Linac

Suganuma, Kazuaki; Hiroki, Fumio; Ito, Takashi; Yamazaki, Yoshio

Proceedings of 16th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.846 - 848, 2019/07

In the past, water flow decreased at water cooling system in J-PARC Linac. Contamination get mixed in cooling water. The problem was resolved by changing the system of the circulation pumps and reducing the tiny metal in water cooling system. However, suppression of occurring tiny metal is unresolved. The tiny metal is the unique problem of accelerator. It is caused by heavy using oxygen free copper and phosphorus deoxidized copper. The two copper is used for the part of accelerator and purified water. The object of the report is investigation of tiny metal contamination of water cooling system in J-PARC Linac.

Journal Articles

Present status of water cooling system at J-PARC linac 2018

Suganuma, Kazuaki; Hiroki, Fumio; Ito, Takashi; Yamazaki, Yoshio

Proceedings of 15th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.309 - 311, 2018/08

It is the report to improve the problem of flow reduction in water cooling system resolved completely in summer, 2017. It is continued the phenomenon decreasing the flow (5,800 L/min) of circulating water cooling in DTL and SDTL about 3% per week. By the flow reduction, the entire operation of J-PARC and operation of the accelerator are stopped and low flow contact of flowmeter installed in cavities. The phenomenon is progressed about 9 years since we confirm it and drastic measures for it are aspired. In this report, the point of interest to solve this problem is written. Similarly, it is suggested that the point we should be careful when we use the water cooling system it is one of the utility of J-PARC accelerator. In last summer, the flow reduction is not occur completely as specification changes and replacement of the pumps. Thanks of that, the entire operation and operation of accelerator of J-PARC is operated safety.

Journal Articles

Present status of water cooling system at J-PARC LINAC 2017

Suganuma, Kazuaki; Hiroki, Fumio; Ito, Takashi; Yamazaki, Yoshio

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.871 - 873, 2017/12

J-PARC LINAC has a problem that the amount of the flowing water is reduced. It spends such time from alarm to the restoration that it is desirable to take measures. So we have to solve this problem. We tried to focus again on the related water level fluctuation in the storage tank of cooling water equipment and the flow rate fluctuation all of the cooling water that has observed in cooling water equipment named RI4 from RFQ to SDTL of the LINAC. At the same time, we check new information of the operating data. We have hypothesized about the cause of fluctuation of the whole flow rate. That can be deterioration of water quality and lacking of performance of circulation pumps. That can be deterioration of water quality and lacking of performance of circulation pumps.

Journal Articles

Present status of water cooling system at J-PARC linac

Suganuma, Kazuaki; Hiroki, Fumio; Ito, Takashi; Yamazaki, Yoshio

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.304 - 306, 2016/11

J-PARC LINAC has a problem that the amount of the flowing water is reduced. It spends such time from alarm to the restoration that it is desirable to take measures. So we have to solve this problem. We tried to focus again on the related water level fluctuation in the storage tank of cooling water equipment and the flow rate fluctuation all of the cooling water that has observed in cooling water equipment named RI4 from RFQ to SDTL of the LINAC. At the same time, we check new information of the operating data. We have hypothesized about the cause of fluctuation of the whole flow rate. That can be deterioration of water quality and lacking of performance of circulation pumps. That can be deterioration of water quality and lacking of performance of circulation pumps.

Journal Articles

Influence of magnetic field on turbomolecular pumps

Kanazawa, Kenichiro; Ogiwara, Norio; Suganuma, Kazuaki; Inohara, Takashi*; Wada, Kaoru*

Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.391 - 393, 2008/00

no abstracts in English

Journal Articles

New Decladding System in the Reprocessing Process for Fast Reactor Fuel

Yamada, Seiya; Washiya, Tadahiro; Takeuchi, Masayuki; Suganuma, Takashi; Aose, Shinichi

Proceedings of 12th International Conference on Nuclear Engineering (ICONE-12) (CD-ROM), 8 Pages, 2004/00

As a part of the feasibility study on commercialized fast reactor cycle systems, Japan Nuclear Cycle Development Institute (JNC) has been developing the fuel decladding technology for the dry reprocessing process (oxide electrowinning process) and aqueous reprocessing process. Particularly, in the oxide electrowinning process, the spent fuel should be reduced to powder for quick dissolution in the molten salt at electrolyzer. Heat treatment method such as a voloxidation might not be applicable in the decladding process, because of the high plutonium content as fast reactor fuel. Therefore, JNC proposes new decladding system with innovative mechanical decradding devices. The decladding system consists of fuel crushing stage, hull separation stage and hull rinsing stage. In this paper, the outline of this new decladding system and its innovative devices will be descried.

Journal Articles

Corrosion Resistance of Ceramic Materials in Pyrochemical Electrowinning Condition

Takeuchi, Masayuki; Kato, Toshihiro*; Washiya, Tadahiro; Takashi, Suganuma,; Aose, Shinichi

Saikuru Kiko Giho, (23), p.31 - 40, 2004/00

The corrosion resistance of ceramic materials was discussed through thermodynamic calculation and corrosion test. The corrosion test was basically carried out in alkari molten salt under chlorine gas. In addition, the effects of oxygen, carbon and simulated fission products on ceramics corrosion were evaluated in molten salt under chlorine gas. As results, silicon nitrides, mullite and cordierite had a good corrosion resistance in above conditions.

Journal Articles

Development of New Decladding System in the Reprocessing Process for FBR Fuel

Washiya, Tadahiro; Koizumi, Kenji; Koichi, Sugai,*; Takashi, Suganuma,; Aose, Shinichi

Saikuru Kiko Giho, (25), p.33 - 44, 2004/00

As a part of the feasibility study (FS) on commercialized fast reactor cycle systems, JNC has been developing the fuel decladding technology for the dry reprocessing process (oxide electrowinning process). In this process, the spent fuel should be reduced to powder for quick dissolution in the molten salt at electrolyzer. Therefore, JNC proposes new decladding system with innovative mechanical decradding devices. The decladding system consists of fuel crushing stage, hull separation stage and hull rinsing stage. In the fuel crushing stage, disassembled spent fuel pins are crushed and powdered by mechanical decladding device, then the following stage, the hull and the fuel powder are separated by magnetic separator. Only the fuel powder is fed to the electrolyzer. On the other side, the separated hull is melted by induction heating method, and the small amount of oxide included in the hull fragments is recovered at the hull rinsing stage. The recovered oxide fuel is fed back to the electrolyzer.

Journal Articles

Simple multijunction launcher with oversized waveguides for lower hybrid current drive on JT-60U

Ikeda, Yoshitaka; Naito, Osamu; Seki, Masami; Kondoh, Takashi; Ide, Shunsuke; ; *; ; *; ; et al.

Fusion Engineering and Design, 24, p.287 - 298, 1994/00

 Times Cited Count:21 Percentile:14.54(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Plasma coupling test of RF heating system in JT-60

Uehara, Kazuya; Ikeda, Yoshitaka; Saigusa, Mikio; Sakamoto, Keishi; Fujii, Tsuneyuki; Maebara, Sunao; Tsuneoka, Masaki; Seki, Masami; Moriyama, Shinichi; Kobayashi, Noriyuki*; et al.

Fusion Engineering and Design, 19(1), p.29 - 40, 1992/07

 Times Cited Count:1 Percentile:82.08(Nuclear Science & Technology)

no abstracts in English

Journal Articles

The Distant coupling of LHCD launcher in the JT-60U

Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi; Ushigusa, Kenkichi; Naito, Osamu; Ide, Shunsuke; Kondoh, Takashi; Nemoto, Masahiro; Takeuchi, Hiroshi; Suganuma, Kazuaki; et al.

Proc. of the 19th European Conf. on Controlled Fusion and Plasma Physics, p.985 - 988, 1992/00

no abstracts in English

Journal Articles

Construction and testing of the new multijunction LHRF launcher for JT-60 upgrade

Seki, Masami; Ikeda, Yoshitaka; *; Imai, Tsuyoshi; ; Yokokura, Kenji; Sawahata, Masayuki; Suganuma, Kazuaki; Sato, Minoru; *; et al.

Fusion Technology 1990, p.1060 - 1064, 1991/00

no abstracts in English

Journal Articles

Technical performance of fast frequencyshift of JT-60 LHRF system during a plasma shot

Ikeda, Yoshitaka; Imai, Tsuyoshi; Fujii, Tsuneyuki; Honda, Masao; ; Maebara, Sunao; Nagashima, Takashi; Saigusa, Mikio; Sakamoto, Keishi; Sawahata, Masayuki; et al.

Fusion Engineering and Design, 13, p.209 - 217, 1990/00

 Times Cited Count:1 Percentile:79.77

no abstracts in English

Journal Articles

Efficient lower hybird current drive us ing multijunction launcher on JT-60

Ikeda, Yoshitaka; Imai, Tsuyoshi; Ushigusa, Kenkichi; Seki, Masami; *; Naito, Osamu; Honda, Masao; ; Maebara, Sunao; Nagashima, Takashi; et al.

Nuclear Fusion, 29(10), p.1815 - 1819, 1989/10

 Times Cited Count:24 Percentile:29.9(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Trouble analysis of external stress corrosion cracking on the ultra high-vacuum ceramic break flange

Yokokura, Kenji; Ikeda, Yoshitaka; Suganuma, Kazuaki; Nagashima, Takashi; *

Shinku, 31(12), p.945 - 953, 1988/12

no abstracts in English

Journal Articles

Current drive and confinement studies during LHRF experiments in JT-60

Imai, Tsuyoshi; Ushigusa, Kenkichi; Sakamoto, Keishi; Ikeda, Yoshitaka; Fujii, Tsuneyuki; Saigusa, Mikio; Yoshino, Ryuji; Uehara, Kazuya; Nagashima, Takashi; Kimura, Haruyuki; et al.

Nuclear Fusion, 28(8), p.1341 - 1350, 1988/00

 Times Cited Count:24 Percentile:33.44(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Vacuum pumping system for JT-60 Heating system

Yokokura, Kenji; Ikeda, Yoshitaka; Imai, Tsuyoshi; Suganuma, Kazuaki; Nagashima, Takashi

Shinku, 31(5), p.359 - 364, 1988/00

no abstracts in English

Journal Articles

RF performance test and current operations of LHRF and ICRF heating systems and JT-60

Imai, Tsuyoshi; Nagashima, Takashi; Kimura, Haruyuki; Uehara, Kazuya; ; Fujii, Tsuneyuki; Honda, Masao; Ikeda, Yoshitaka; *; ; et al.

AIP Conference Proceedings 159, p.115 - 118, 1987/00

no abstracts in English

Oral presentation

Development of efficient dissolution technology for FBR MOX fuel, 8; Effect of rocking motion on mass transfer in rotary dram type continuous dissolver

Hoshino, Takanori; Ikeuchi, Hirotomo; Sano, Yuichi; Watanabe, Masayuki; Suganuma, Takashi

no journal, , 

no abstracts in English

Oral presentation

Engneering scale test of FBR fuel disassembly and pin bundle shearing technology

Wakui, Ryohei; Higuchi, Hidetoshi; Kitagaki, Toru; Washiya, Tadahiro; Takeuchi, Masayuki; Kobayashi, Tsuguyuki*; Watanabe, Masayuki; Suganuma, Takashi

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)