Abstract:
Background The electron beam test platform, as the pre-research project of Shenzhen Superconducting Soft X-ray Free Electron Laser (S3FEL), will be used to overcome several major key technologies in high repetition frequency free electron laser.
Purpose Based on the previously proposed beam window (BW) design integrated into the beam dump, this study aims to conduct the radiation safety analysis and the thermo-structural analyses under non-ideal conditions during operation.
Methods The radiation dose at the beam window was calculated and analysed using the Monte Carlo method. To evaluate the robustness of BWs during operation, the thermo-structural analyses were conducted using the finite element analysis method under non-ideal situations, including beam eccentricity, beam shrinkage, and reduced cooling water flow rate.
Results The results show that the radiation dose at 30 cm outside the side walls and ceiling complies with Chinese national standards, verifying the radiation safety of the scheme. Besides, the results indicate that beam eccentricity has negligible effects on the temperature, stress, and deformation of the beam window. Both beam shrinkage and reduced cooling water flow rate lead to increased temperature, stress, and deformation.
Conclusions However, the standard deviation of the beam shrinkage must not fall below 10% of its original value, and the cooling water flow rate must not be lower than 0.2 m/s; otherwise, the safe operation of the beam window would be compromised. This paper clarifies the safety operation threshold for the beam window, providing a theoretical basis for its secure operation.
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