抄録
A liquid lead-bismuth target circulated by a bubble pump was proposed for the accelerator target for spallation neutron source and accelerator driven system (ADS). A bubbler is required for the lead-bismuth target loop to control the oxygen concentration for avoiding corrosion. An idea was to use the bubbler as the bubble pump to make target cooling system with out mechanical pump. Measurements of the liquid velocity and the void fraction distributions in the bubble pump system in the target should be clarified at first for the thermal hydraulic designs of this target system. Neutron radiography was applied to these measurements and reasonable results were obtained.
