MARS14 Monte Carlo simulation for the shielding studies of the J-PARC 3 GeV ring
1 High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
2 Fermi National Accelerator Laboratory (FNAL), Batavia, IL 60510-0500, USA
3 Japan Atomic Energy Research Institute (JAERI), Present address: Tokai-mura, Ibaraki 319-1195, Japan
4 Stanford Linear Accelerator Center (SLAC), Stanford Univ, Stanford, CA 94309, USA
* Corresponding author: noriaki.nakao{at}kek.jp
MARS14 Monte Carlo simulations were performed for collimation and shielding studies of the J-PARC 3 GeV synchrotron ring. The beam line module locations in the 348.3 m ring and the curved tunnel sections were described by the ‘MAD-MARS beam line builder’ tool. A 400 MeV proton beam loss distribution, calculated with the STRUCT code, was used as a 4 kW source term in the collimator region, with 1 kW source terms in the injection and extraction regions at 400 MeV and 3 GeV, respectively. Deep penetration calculations were carried out with good statistics using a newly developed three-dimensional multi-layer technique. Prompt dose-rate distributions were calculated inside and outside the concrete and soil shield up to the ground level. Using the calculation results obtained thus, an effective shielding design was made.