Numerical Simulation of Heat Radiation Characteristics of East Plug-in Cryopump

The EAST window plug-in cryopump is an important component for divertor particle discharge,and the influence of radiant heat load on its pumping performance cannot be ignored. In this paper, the structure of the cryopump is first designed, in which the radiation baffle is preset with three structural forms, and the simulation software COMSOL is used to analyze the radiant heat it receives. The results show that the radiation heat load of the low temperature plate is about three times that of the herringbone baffle when the louvered baffle is used, and a more reasonable baffle structure is obtained from the control analysis. The surface treatment method of the cryopump was explored, and it was found that the effects of polishing and blackening of the inner wall of the cold shield on the radiant heat load on the cryopanel were basically the same, but compared with blackening, polishing could reduce the radiant heat on the cold shield. Under the premise of little influence on the radiant heat load of the cryopanel, polishing the surface of the radiation baffle can reduce the radiant heat by about 40% compared with the blackening of the entire surface. Finally, the radiation heat load distribution of baffle array and cryopanel array is analyzed to provide guidance for the design of cooling structure. The research provides data reference and design basis for the research and development of EAST window plug-in cryopump.