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Nishio, Satoshi
Purazuma, Kaku Yugo Gakkai-Shi, 80(11), p.944 - 948, 2004/11
Low aspect ratio tokamak power reactor with super-conducting toroidal field (TF) coils has been proposed. A center solenoid coil system and an inboard blanket were removed. The key point was how to find the engineering design solution of the TF coil system with the high field and high current density. The coil system with the center post radius of less than 1 m can generate the maximum field of 
20 T. This coil system causes a compact reactor concept, where the plasma major and minor radii of 3.5 m and 1.5 m, respectively and the fusion power of 3 GW.
; Miyamoto, Yoshiaki; Shiozawa, Shusaku
Proceedings of 7th International Conference on Nuclear Engineering (ICONE-7) (CD-ROM), 10 Pages, 1999/00
no abstracts in English
Uchida, Masaaki
Journal of Nuclear Science and Technology, 30(8), p.752 - 761, 1993/08
Times Cited Count：2 Percentile：29.78(Nuclear Science & Technology)no abstracts in English
Ninomiya, Hiromasa; JT-60 Team
15th IEEE/NPSS Symp. on Fusion Engineering,Vol. 2, 0, p.779 - 787, 1993/00
no abstracts in English
Yoshida, Hiroshi; Enoeda, Mikio; Hirata, Shingo*; Ito, H.*
JAERI-M 92-070, 45 Pages, 1992/05
no abstracts in English
; ;
JAERI-M 8548, 37 Pages, 1979/11
no abstracts in English
Kosuge, Atsushi; Minehara, Eisuke*
no journal, ,
In the decommissioning of nuclear reactors, it is possible to reduce the amount of radioactive wastes and significantly reduce the storage cost by efficiently decontaminating the contaminated concrete used in the reactor building. Conventional decontamination methods have some disadvantages. Laser decontamination has been shown to be non-contact, remote-controlled, especially capable of a decontamination coefficient of 100%, and significantly suppresses the generation of secondary wastes. Irradiation of the concrete surface with a laser causes the formation of a glass layer on the surface, thermal fracturing, and an explosive fracture by water and carbonate. In this study, we explain observations for elucidating the surface peeling mechanism of the concrete surface layer using high-speed scanning of a high-power density continuous-wave fiber laser.
Kosuge, Atsushi
no journal, ,
Decontamination using lasers is non-contact, can be operated remotely, and can significantly suppress secondary waste generation. We are developing a laser decontamination technique using instantaneous evaporation by focusing a high-power continuous-wave fiber laser to a small spot size and sweeping it at high speed with high power density, and are conducting experimental and analytical evaluations. In this presentation, samples were laser irradiated under various laser irradiation conditions, and the depth of melting was observed by cross-sectional measurement and surface observation of metal ablation. Simulated decontamination tests were also conducted by measuring fluorescence spectral intensity using fluorescent paint as a simulated contaminant, and changes in the amount of removal due to laser irradiation conditions were investigated.
