Neutronic performance of cold moderators in the JAERI 5 MW pulsed spallation source

Conference · Mon Sep 01 04:00:00 EDT 1997

OSTI ID:1164834

Watanabe, N.; Teshigawara, T.; Takada, H.; Nakashima, H.; Suzuki, J.; Aizawa, K.; Oyama, Y.; Kosako, K.

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-CH₄) 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-H₂) moderator by about a factor of 2 compared with that in a decoupled L-H₂ 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)

• Research Organization: Japan Atomic Energy Research Inst., Tokai-mura, Ibaraki (Japan); Sumitomo Atomic Power Industries, Ltd., Tokyo (Japan)
• OSTI ID: 1164834
• Report Number(s): IWCMPNS--1997; CONF-9709132--
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
COLD NEUTRONS
COMPARATIVE EVALUATIONS
ENERGY ABSORPTION
ENERGY LOSSES
HYDROGEN
JAERI
LIQUIDS
MODERATORS
MONTE CARLO METHOD
NEUTRON REFLECTORS
NEUTRON SOURCES
PERFORMANCE
POWER RANGE 01-10 MW
PULSES
SPALLATION
WATER