; Wu Qing-Biao] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Li Wen-Qian] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
The current design of the CSNS/RCS beam collimation system consists of a two-stage betatron collimation and a single momentum collimator. This paper summarizes various aspects of collimator design, including collimation principle and layout, material choice and collimator mechanical structure, etc. At last, radiation and thermal analysis are carried out to illustrate the feasibility of the current beam collimation scheme.