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Yamamoto, Kazami; Kinsho, Michikazu; Hayashi, Naoki; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Tani, Norio; Takayanagi, Tomohiro; Kamiya, Junichiro; Shobuda, Yoshihiro; et al.
Journal of Nuclear Science and Technology, 59(9), p.1174 - 1205, 2022/09
Times Cited Count：5 Percentile：87.42(Nuclear Science & Technology)In the Japan Proton Accelerator Research Complex, the purpose of the 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at a repetition rate of 25 Hz at high intensities, the RCS was elaborately designed. After starting the RCS operation, we carefully verified the validity of its design and made certain improvements to establish a reliable operation at higher power as possible. Consequently, we demonstrated beam operation at a high power, namely, 1 MW. We then summarized the design, actual performance, and improvements of the RCS to achieve a 1 MW beam.
Sn superconducting coils in JAERI Demo Poloidal Coil ProjectOkuno, Kiyoshi; Takahashi, Yoshikazu; Tsuji, Hiroshi; Ando, Toshinari; Nishi, Masataka; Yoshida, Kiyoshi; Sugimoto, Makoto; Koizumi, Norikiyo; Hosono, Fumikazu*; *
IEEE Transactions on Applied Superconductivity, 3(1), p.602 - 605, 1993/03
Times Cited Count：5 Percentile：50.18(Engineering, Electrical & Electronic)no abstracts in English
Ishimaru, Tsuneari; Niwa, Masakazu; Shimada, Koji; Kurosawa, Hideki; Moriya, Toshifumi*
no journal, ,
Fault activity causes deformation and mechanical damage, and subsequent change in the groundwater flow, to the surrounding rocks. For the site selection of underground repositories of high-level radioactive waste, describing the spatial distribution and characteristics of topographic lineaments, crush zones and fractures concerning fault activity is essential for the assessment of long-term stability of geological environment in the investigation area. As regarding fault crush zones, their spatial distribution is constrained by the heterogeneity of fault geometry such as stepover, and their characteristics is involved in their permeability structure. Here, we present the procedure and result of the geological survey in the western part of the Atotsugawa Fault, Gifu Prefecture, which is practiced a case study focused on the spatial distribution and characteristics of fault crush zones.
Niwa, Masakazu; Ishimaru, Tsuneari; Kurosawa, Hideki; Shimada, Koji; Moriya, Toshifumi*; Takahashi, Kazuharu*
no journal, ,
It is suggested that fracture zones formed by fault activities have an effect on hydrologic feature of surrounding rocks. Spatial distribution and features of fracture zones in surveyed areas are informative for site selection and design of geological repositories. Here we show a case study in the Atotsugawa Fault, northern Gifu Prefecture. Field mapping in the study area indicates that the number of fracture zone is sharply reduced, and width of each fracture zones falls within 2 m, with distance of more than 500 m from the surface trace of the Atotsugawa Fault.
