Author: Kobayashi, H.
Paper Title Page
THPPR048 Construction of a BNCT Facility using an 8-MeV High Power Proton Linac in Tokai 4083
  • H. Kobayashi, T. Kurihara, H. Matsumoto, M. Yoshioka
    KEK, Ibaraki, Japan
  • T. Hashirano, F. Inoue, K. Sennyu, T. Sugano
    MHI, Hiroshima, Japan
  • F. Hiraga, Y. Kiyanagi
    Hokkaido University, Sapporo, Japan
  • H. Kumada
    Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan
  • A. Matsumura, H. Sakurai
    Tsukuba University, Ibaraki, Japan
  • T. Nakamura, H. Nakashima, T. Shibata
    JAEA, Ibaraki-ken, Japan
  • T. Ohba, Su. Tanaka
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture, Japan
  An accelerator-based BNCT (Boron Neutron Capture Therapy) facility is now under construction and the entire system including the patient treatment system will be installed in the Ibaraki Medical Center for Advanced Neutron Therapy (tentative name). The linac specification is 8 MeV with 10 mA of average current (80 kW) with a duty factor of 20%. The linac is composed of a 3-MeV RFQ and a drift-tube linac and can accelerate a peak current of 50 mA up to 8-MeV. The neutron producing target is a 0.5 mm thick beryllium disk 150 mm in diameter which is formed on a heat sink plate. The material components used in the neutron moderator system, including the target, should be selected to have a reduced residual radio-activity. Special attention should be paid to mitigate the swelling of target materials due to hydrogen implantation as well. The development of an accelerator-based BNCT suited for practical application requires input from a wide spread of technical specialties. To obtain the needed breath and strength, we have organized our team with contributing members from diverse institutes and companies. The research and development activities of this integrated team will be presented.  
THPPR059 Progress of the Equivalent Velocity Spectroscopy Method for Femtosecond Pulse Radiolysis by Pulse Rotation and Pulse Compression 4109
  • T. Kondoh, K. Kan, K. Norizawa, A. Ogata, S. Tagawa, J. Yang, Y. Yoshida
    ISIR, Osaka, Japan
  • H. Kobayashi
    KEK, Ibaraki, Japan
  Femtosecond pulse radiolysis is developed for studies of electron beam induced ultra-fast reaction in matter. 98 fs electron pulse was generated by a photocathode RF gun LINAC with a magnetic bunch compressor. However for more fine time resolution, the Equivalent velocity spectroscopy (EVS) method is required to avoid degradation of time resolution caused by velocity difference between electron and analysing light in sample. In the EVS method, incident analysing light is oblique toward electron beam with an angle associated with refractive index of sample, and then, electron pulse is rotated toward the direction of travel to overlap with light pulse. In previous studies, pulse rotation had not been compatible with pulse compression. However, by oblique incident of light to the photocathode, pulse rotation was compatible with pulse compression, and the time resolution was improved by principle of the equivalent velocity spectroscopy.