DEVELOPMENT OF SOLID TARGET FOR SPALLATION NEUTRON SOURCE

摘要

Manufacturing of tungsten based materials for the target of spallation neutron source for the next generation is described. A sintered tungsten block cladded with tantalum sheet and a stainless-steel bonded heavy alloy were selected as candidates for the long-life target materials having enough resistance to corrosion in hot water and less intense susceptibility to radiation damage. The process conditions and pertaining metallurgical problems for the target fabrication are briefly described and discussed. The tantalum-clad tungsten target has been used in the current proton-accelerator-driven pulsed neutron source of the High Energy Accelerator Research Organization, Tsukuba, Japan, and has proved to give neutron yield of 20% higher than that of the current Ta target. The stainless-steel bonded heavy alloy still needs further investigation on the mechanical and corrosion properties.