摘要: We report the calculated results of neutronic performance of cold moderators in a reference target-moderator-reflector system at the projected 5 MW pulsed spallation neutron source in Japan Atomic Energy Research Institute (JAERI)... 展开 We report the calculated results of neutronic performance of cold moderators in a reference target-moderator-reflector system at the projected 5 MW pulsed spallation neutron source in Japan Atomic Energy Research Institute (JAERI). The cold neutron intensities in present reference model are about 2.3-2.5 times higher than that from the decoupled solid methane (S-CH<sub>4) and close to the values obtained at other facilities (LANSCE Upgrade, NSNS, etc.). The H₂O premoderator (PM) reduces the energy deposition in a liquid-hydrogen (L-H<sub>2) moderator by about a factor of 2 compared with that in a decoupled L-H<sub>2 moderator. The dependence of reflector on the neutron intensity and the energy deposition in the cryogenic moderators is also discussed. Although the pulse shapes were not obtained because of time consuming Monte Carlo calculations, we will discuss the pulse shapes based on experiments. (auth) 收起