Abstract: SHINE facility,Shanghai hard Xray free electron laser (XFEL) facility,and jointly built by Shanghai Institute of advanced research and Shanghai Institute of Applied physics,Chinese Academy of Sciences (SINAP,CAS).It is currently under construction in Zhangjiang Science Park,Shanghai.The SHINE facility consists of an 8 GeV continuous-wave (CW) superconducting linear accelerator,a 100 PW laser system,three undulator lines,and ten experimental end-stations at phase-I.A beam dump set at BC3 accelerator section is designed for beam commissioning with beam energy of 7.7 GeV and beam current 0.3 μA based on the preliminary conceptual design.This paper presents the heat analysis of the dump using ANSYS 17.0 and the activation analysis of the beam dump for radiation safety evaluation by using Monte Carlo simulation code FLUKA.It is assumed conservatively that the beam is continuously injected into the dump for 2 000 h during normal operation.The activation analysis showed that the surrounding concrete shielding with the thickness of 55-85 cm for the dump is required,in order to keep the residual dose rate outside the dump below 25 μSv/h at 1 hour after stopping the beam injection.

Key words: activation analysis, beam dump, radiation safety, FLUKA, FEL facility