Evaluation of gamma-ray and neutron energy for area monitoring system in the IFMIF/EVEDA accelerator building

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• 作者：Hiroki Takahashi ; Sunao Maebara ; Hironao Sakaki ; Keiichi Hirabayashi ; Kosuke Hidaka ; Nobuhiro Shigyo ; Yukinobu Watanabe ; Kenshi Sagara
• 关键词：IFMIF/EVEDA prototype accelerator ; Deuteron ; Area monitoring system ; PHITS code
• 刊名：Fusion Engineering and Design
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：87
• 期：7-8
• 页码：1235-1238
• 全文大小：1039 K

文摘

The engineering validation of the IFMIF/EVEDA prototype accelerator, up to 9 MeV by supplying the deuteron beam of 125 mA, will be performed at the BA site in Rokkasho. A design of this area monitoring system, comprising of Si semiconductors and ionization chambers for covering wide energy spectrum of gamma-rays and ³He counters for neutrons, is now in progress. To establish an applicability of this monitoring system, photon and neutron energies have to be suppressed to the detector ranges of 1.5 MeV and 15 MeV, respectively. For this purpose, the reduction of neutron and photon energies throughout shield of water in a beam dump and concrete layer is evaluated by PHITS code, using the experimental data of neutron source spectra. In this article, a similar model using the beam dump structure and the position with a degree of leaning for concrete wall in the accelerator vault is used, and their energy reduction including the air is evaluated. It is found that the neutron and photon flux are decreased by 10⁴-order by employing the local shields using concrete and polyethylene around beam dump, and the photon energy can be suppressed in the low energy.