Neutron and gamma-ray transport calculations in support of the design of the radiation shielding for the TOFED neutron spectrometer at LHD
作者： S. Sangaroon , S. Sangaroon , K. Ogawa , K. Ogawa , S. Conroy
DOI: 10.1016/J.FUSENGDES.2021.112296
关键词:
摘要: Abstract The neutron emission spectrometer (NES) has been commissioned at the Large Helical Device (LHD) with a new Time-Of-Flight-Enhanced-Diagnostics (TOFED). aim of TOFED is to measure energy spectrum study fast-ions behavior such as high-energy ions created by ion cyclotron resonance heating, beam ions, and D-D fusion born 1 MeV tritons in LHD. instrument assembled first detector S1 second S2. In 2019, was installed Z = 13.5 m below midplane without radiation shielding initially commissioned. Due neutrons streaming through considerable number holes LHD torus hall, ambient background higher than expected, which causes large coincidental events on detectors. obtained time difference between S2 provides strong suggestion relocation development. 2020, relocated basement 18.5 midplane. this work, dedicated design investigated using Monte Carlo N-Particle code (MCNP6). fulfills criteria moderation capability engineering constraints. criteria, borated polyethylene thickness 20 cm being considered lead 5 gamma-ray shielding. suggested be rectangular polyhedron shaped roof. With designed shielding, flux reduced approximately two orders magnitude more while prompt fluence magnitude. Here, detailed radiations for presented. appropriate from work will TOFED.
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