; Ouyang Hua-Fu] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Wu Xiao-Bing] CAS, Grad Univ, Beijing 100049, Peoples R China
There are two cooling systems to maintain the thermal stability of the CSNS H- ion source during its operation: Air-cooling in the source body of the discharging chamber and water-cooling in the flange on which the discharging chamber is installed. The optimal cooling parameters to ensure the operation of the H- ion source are determined through a thermal analysis. In addition, a transient analysis is also performed to know exactly the transient temperature variation during the whole 40 ms period of the pulsed mode operation of the ion source.