Purpose The high-energy photon source (HEPS) is the first fourth-generation light source under construction in China. It is designed to operate at an average current of 200 mA stored beam current with a top-up model at 6 GeV energy. Considering the linac radiation shielding design, a suitable beam loss scenario, optimized thickness for the bulk shielding and detailed structure design for dumps should be proposed. In this paper, the beam loss scenarios were determined and categorized as normal; the dose limits were presented; using these scenarios and the dose limits, the thickness of the linac tunnel was calculated and detailed designs of the main beam dumps were established. The material selection and size setting of the low-power electron beam dump were discussed. Method The Monte Carlo code is a good choice to simulate the radiation analysis. And the iSHIELD11 was used to verify the simulation calculations. Result and conclusionThe designs of the linac bulk shield and dumps satisfied the requirements of radiation protection.

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