Centers & Labs

RIKEN SPring-8 Center

Safety Design Group

Group Director: Shunji Goto (D.Eng.)
Shunji  Goto(D.Eng.)

The group evaluates radiation safety and radiation shield performance by analyzing the measured data. The group also carries out R&D on beam loss monitors with high functionality and R&D on the performance improvement of the radiation monitors.

Research Subjects

  • Research of radiation physics and behaviors for XFEL accelerators
  • Research of radiation shielding and protection for XFEL accelerators
  • Radiation safety design for advanced XFEL facility
  • Research and developments for radiation monitors including electron beam loss and beam halo monitors of advanced XFEL accelerators.

Selected Publications

  1. Yoshihiro Asano, Toshiro Itoga, and Xavier Marechal:
    "Radiation Shielding aspects of the SCSS prototype XFEL facility."
    Nuclear Technology Vol.168 387-390 (2009)
  2. Yoshihiro Asano, Teruhiko Bizen, and Xavier Marechal:
    "Analyses of the factors for demagnetization of permanent magnet caused by high energy electron irradiation."
    Journal of Synchrotron Radiation Vol. 16 p317-324 (2009)
  3. X.-M.Marechal, T.Itoga, Y.Asano:
    "Fiber Beam loss Monitor For the SPring-8 X-FEL;Test Operation at the SPring-8 250MeV Compact SASE Source."
    International Particle Accelerator Conference (IPAC'10) Kyoto (2010)
  4. H.Aoyagi, T.Itoga, N.Nariyama, T.Bizen, T.Tanaka, H.Kitamura, and Y.Asano:
    "Measurement of Electron Beam halo with Diamond Detector."
    Proc. of the 24th workshop on Radiation Detectors and Their Uses. p73-81, KEK proceedings2010-10
  5. Y.Asano:
    "Application of Heavy Concretes to the Shield Materials of Synchrotron Radiation beamlines."
    Radiation Measurements 46 p546-550 (2011)
  6. T. Itoga, Y.Asano, and Y.Tanimura:
    "Response Function of a Superheated Drop Neutron Monitor with Lead Shell in the thermal to 400MeV Energy Range."
    Radiation Protection Dosimetry ncr120 (2011)
  7. Yoshihiro Asano:
    "Characteristics of radiation safety for Synchrotron Radiation and X-ray Free Electron Laser facilities."
    Radiation Protection Dosimetry ncr131 (2011)
  8. X.M.Mareshal, Y.Asano, T.Itoga:
    "Design, development, and operation of a fiber-based Cherenkov beam loss monitor at the Spring-8 Angstrom Compact Free Electron Laser"
    Nuclear Instruments & Methods A673 (2012)
  9. H.Aoyagi, Y.Asano,T.Itoga, N.Nariyama, T.Bizen, T.Tanaka,, H.Kitamura:
    "Pulse-mode Measurement of Electron Beam halo using Diamond -based detector"
    Physical Review ST Accelerators & Beams 15 (2012)
  10. Yoshihiro Asano:
    "Radiation Ssafety"
    Free electron Laser Chapter 10, Intech Open publisher (2012)