title: Mars14 Monte Carlo simulation for the shielding studies of the J-PARC 3 GeV ring.
abstract: 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.
authors.affiliation: High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan. noriaki.nakao@kek.jp
authors.forename: Noriaki
authors.initials: N
authors.lastname: Nakao
authors.forename: Nikolai
authors.initials: N
authors.lastname: Mokhov
authors.forename: Kazami
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Irie
authors.forename: Alexander
authors.initials: A
authors.lastname: Drozhdin
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007564:Japan; D015233:Models, Statistical; D009010:Monte Carlo Method; D011522:Protons; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods*; D011874:Radiometry / Q000379:methods*; D017356:Synchrotrons / Q000295:instrumentation*
chemical_list: D011522:Protons