28-30 November 2019
C-CUBE, Kyushu University Chikushi Campus 九州大学筑紫キャンパス総合研究棟 (C-Cube)
Asia/Tokyo timezone
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Contribution Oral

C-CUBE, Kyushu University Chikushi Campus 九州大学筑紫キャンパス総合研究棟 (C-Cube) - Chikushi Hall 筑紫ホール

Topics from Radiation Safety Design of J-PARC


The J-PARC (Japan Proton Accelerator Research Complex) is a high-intensity and high-energy proton accelerator complex which consists of the accelerator components of a 400-MeV linac, a 3 GeV synchrotron with 1 MW power and a 30-GeV synchrotron with a few tenth of kW power. These accelerators are providing 3 GeV beam of 1 MW to the Material and Life science Experimental Facility and 50 GeV beam of a few tenth of kW to the Hadron Experimental and the Neutrino Experimental Facilities.
Because of its very high beam power and its energy as well as the large-scale accelerator complex, we encountered some very difficult radiation problems on radiation safety design. The shielding study revealed that the facilities required very thick shielding, resulting in shielding required large portion of the total construction cost. Therefore, the radiation safety design was carried out in various characteristics ways, such as combining simple and detailed design methods. In this presentation, I will introduce the activity confinement system, the use of low- activationaized concrete, and the environmental impact assessment as examples in the various ways. In addition, as new issues found during the 10 years after the completion of construction, the activity caused by muons, and the effects of Λ and Σ particles on radiation transport will be presented.