Study on Neutronics Scheme for Cold Neutron Source in China Advanced Research Reactor

Cold Neutron Source（CNS）is one of the important systems through which China Advanced Research Reactor（CARR）could be used as important application platform of Neutron Scattering Experiment. This paper establishes the calculation program and methods to analyze the nuclear heating and gain factor. Many factors have bean calculated and optimized for the CNS in CARR and the neutronics scheme is decided. The results show that better gain factor can be approached with relatively low nuclear heating for moderator cell,which is accorded with the characteristics of CARR CNS and is a new crescent cell configuration in the world