Author: Ogitsu, T.
Paper Title Page
THPPD024 Irradiation Effects in Superconducting Magnet Materials at Low Temperature 3551
  • M.Y. Yoshida, M.I. Iio, S. Mihara, T. Nakamoto, H. Nishiguchi, T. Ogitsu, M. Sugano, K. Yoshimura
    KEK, Ibaraki, Japan
  • M. Aoki, T. Itahashi, Y. Kuno, A. Sato
    Osaka University, Osaka, Japan
  • Y. Kuriyama, Y. Mori, B. Qin, K. Sato, Q. Xu, T. Yoshiie
    Kyoto University, Research Reactor Institute, Osaka, Japan
  Superconducting magnets for high intensity accelerators and particle sources are exposed to severe radiation from beam collisions and other beam losses. Neutron fluence on the superconducting magnets for the next generation projects of high energy particle physics, such as LHC upgrades and the COMET experiment at J-PARC, is expected to exceed 1021 n/m2, which is close to the requirements on the fusion reactor magnets. Irradiation effects at low temperature in superconducting magnet materials should be reviewed to estimate the stability of the superconducting magnet system in operation and its life. The pion capture superconducting solenoids for the COMET experiment are designed with aluminum stabilized superconducting cable to reduce the nuclear heating by neutrons. Also, the heat is designed to be transferred in pure aluminum strips. Irradiation effects on the electrical conductance of aluminum stabilizer and other materials are tested at cryogenic temperature using the reactor neutrons. This paper describes the study on the irradiation effects for the magnet developments.  
THPPR047 Design of Superconducting Rotating-gantry for Heavy-ion Therapy 4080
  • Y. Iwata, T. Furukawa, A. I. Itano, K. Mizushima, S. Mori, K. Noda, T. Shirai
    NIRS, Chiba-shi, Japan
  • N. Amemiya
    Kyoto University, Kyoto, Japan
  • T. Fujimoto
    AEC, Chiba, Japan
  • T.F. Fujita
    National Institute of Radiological Sciences, Chiba, Japan
  • T. Obana
    NIFS, Gifu, Japan
  • T. Ogitsu
    KEK, Ibaraki, Japan
  • T. Orikasa, S.T. Takami, S. Takayama, I. Watanabe
    Toshiba, Tokyo, Japan
  We designed a superconducting rotating-gantry for heavy-ion therapy. This isocentric rotating-gantry can transport heavy ions having 430 MeV/u to the isocenter with irradiation angles between 0-360 degrees, and further has the capability of our fast raster-scanning irradiation, as employed in the existing fixed-irradiation-ports. For the magnets, combined-function superconducting-magnets will be employed. The use of these superconducting magnets allowed us to design the compact gantry, while keeping a sufficient scan size at the isocenter; the length and radius of the gantry would be approximately 13m and 5.5m, respectively, which are comparable to those of the existing proton gantries. Superconducting coils were designed by using the 3D field solver, so as to obtain uniform field distributions. The two superconducting magnets are being constructed. We will present the design of the superconducting gantry as well as details of the superconducting magnets.