Author: Nakamura, H.
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WEPOR021 Residual Radiation Monitoring by Beam Loss Monitors at the J-PARC Main Ring 2715
  • T. Toyama, K. Satou
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • H. Kuboki, H. Nakamura, B. Yee-Rendón
    KEK, Ibaraki, Japan
  • M.J. Shirakata
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  At J-PARC (the Japan Proton Accelerator Research Complex), high intensity proton accelerator, controlling and localizing beam losses and residual radiations are key issue, because the residual radiation limits maintenance work in efficiency and working hours, and then limits machine availability. We are accumulating continuous measurement data of residual radiation after beam stop using beam loss monitors in the Main Ring (MR). The wire cylinder gaseous radiation detectors are used in a proportional counting region. The heads are DC-connected and have a gain as large as 30000 with a bias of -2 kV. We switch the DAQ trigger from "Beam Trigger" to "No Beam Trigger", change the ADC sampling rate to 16 ms, and raise the gain by changing the bias voltage from -1.6 kV to -2.0 kV with a few exceptions when the accelerator operation ends. The offsets are measured with zero bias voltage. Identification of radionuclides has been performed with time decay analysis, with assistance of energy spectrum measurements with the Gamma Ray Spectrometer, Kromek GR1-Spectro.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR021  
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WEPOR022 Residual Radiation Measurements at J-PARC MR Using the ASTROCAM 7000HS Newly Developed Radioactive Substance Visualization Camera 2719
  • N. Ikeda, T. Sugano
    MHI-MS, Kobe, Japan
  • K. Genba, M. Komeda, Y. Kuroda, D.M. Matsuura
    MHI, Komaki, Japan
  • A. Harayama, T. Takahashi, S. Watanabe
    ISAS/JAXA, Kanazawa, Japan
  • H. Nakamura, K. Niki, C. Ohmori, M.J. Shirakata
    KEK, Ibaraki, Japan
  • S. Takeda
    OIST, Onna-son, Okinawa, Japan
  Mitsubishi Heavy Industries, Ltd. (MHI) released the ASTROCAM 7000HS, a radioactive substance visualization camera. The ASTROCAM 7000HS incorporates the technologies for the gamma-ray detector used for the ASTRO-H satellite, which MHI has been developing under entrustment from and together with scientists at the Institute of Space and Astronautical Science (ISAS) at the Japan Aerospace Exploration Agency (JAXA), and the design was modified for use on land to commercialize the product. MHI and Mitsubishi Heavy Industries Mechatronics Systems, Ltd. (MHI-MS) performed on-site residual radiation measurements at the 50 GeV Main Ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC) under collaboration with the High Energy Accelerator Research Organization (KEK) and the Japan Atomic Energy Agency (JAEA) and succeeded visualization of radiation hot spots of the accelerator components. The outline of the ASTROCAM 7000HS, the measurement principle and the first measurement results at the J-PARC MR are described.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR022  
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