HUNS upgrade; Simulation of the beam profile for a thermal neutron source in HUNS-2
- Dr. Kaoru HARA
- Dr. Kaoru HARA (Faculty of Engineering, Hokkaido University)
The electron linear accelerator in Hokkaido University Neutron Source (HUNS ) was recently upgraded toward HUNS-2 to increase the electron beam current. The HUNS-2 is an accelerator-driven neutron source that is equipped with a cold-, thermal- and fast-neutron type of sources. Experiments such as a small angle neutron scattering , neutron transmission imaging  and neutron irradiation test have been currently conducted using HUNS-2 for studies of material science and developments of measurement method.
In this work, the neutron beam profile for the HUNS-2 thermal neutron source was calculated with the Monte Carlo simulation code PHITS  to improve a target, moderator and reflector assembly (TMRA) of the present thermal neutron source system . The TMRA consists mainly of a neutron production target with a tungsten disc, lead blocks and water channels, a polyethylene moderator and graphite reflectors. Through the simulations, a position and size of TMRA was designed for increasing the intensity of thermal neutron beam.
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