Safety analysis of injector dump beam window for the electron beam test platform of S<sup>3</sup>FEL

Zhang Hao; Huang Liming; Lin Hanwen; Li Lei; Zhao Feng; Chang Renchao; Wei Jianping; Zhu Xiaoxiao; Zhao Yu; Tao Kai; Wei Wei

doi:10.11884/HPLPB202537.250179

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Article Navigation > High Power Laser and Particle Beams > 2025 > Accepted Manuscript

Zhang Hao, Huang Liming, Lin Hanwen, et al. Safety analysis of injector dump beam window for the electron beam test platform of S3FEL[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250179

Citation:

Zhang Hao, Huang Liming, Lin Hanwen, et al. Safety analysis of injector dump beam window for the electron beam test platform of S³FEL[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250179

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Safety analysis of injector dump beam window for the electron beam test platform of S³FEL

doi: 10.11884/HPLPB202537.250179

Institute of Advanced Light Source Facilities, Shenzhen 518107, China

Received Date: 2025-06-20
Accepted Date: 2025-08-21
Rev Recd Date: 2025-08-04

Available Online: 2025-09-06

Abstract

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 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 robust of BWs during operation, the thermo-structural analyses was 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 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.
- free electron laser,
- high repetition frequency,
- beam window,
- safety

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References(18)

References

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