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Report No.

Shielding Design of a Neutron Beam Line "NOBORU" at JSNS/J-PARC

Harada, Masahide  ; Oikawa, Kenichi  ; Kasugai, Yoshimi ; Maekawa, Fujio 

NOBORU is one of 23 neutron beam ports in JSNS/J-PARC to measure neutron source characteristics and to be applicable to various test experiments. Shielding for NOBORU must be tough due to the large neutron beam size and the high beam power at 1MW. In this study, we determined the shielding structure of NOBORU by neutronics calculations. In the shielding calculation, we considered neutron beam loss conditions caused by various beam line components. As a result, shielding structures that satisfied all the necessary radiation dose limits adopted in the J-PARC were determined. We measured dose rates in the experimental room of NOBORU during operation. The measured values were in good agreement with the calculated ones within a factor of 2. In addition, we also evaluated the effectiveness of a neutron beam shutter and radioactivity of the T$$_{0}$$ chopper.



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