摘要
束流测试平台作为深圳中能高重复频率X射线自由电子激光(S^(3)FEL)的先行启动项目,将用于攻克高重复频率自由电子激光中的多项重大关键技术。基于先前研究中提出的一种内置于废束桶的束窗方案,对其进行了辐射剂量分析,得到两侧墙与顶墙外30 cm处的辐射剂量符合国标要求,验证了该方案的辐射安全性。并基于束窗结构,对束窗运行时可能存在的异常工况包括束流偏心、束流缩束和冷却水流速降低工况进行热结构分析,结果表明束流偏心对束窗的温度、应力与变形影响不显著;束流缩束和冷却水流速降低均会引起温升、应力与变形的升高,但束流标准差缩束为原先值的百分比不能低于10%及冷却水流速不能低于0.2 m/s,否则将影响束窗的安全运行。明确了束窗安全运行的阈值,为束窗的安全运行提供了理论依据。
[Background]The electron beam test platform,as the pre-research project of ShenzhenSuperconducting Soft X-ray Free Electron Laser(S^(3)FEL),will be used to overcome several major key technologies inhigh repetition frequency free electron laser.[Purpose]Based on the previously proposed beam window(BW)designintegrated into the beam dump,this study aims to conduct the radiation safety analysis and the thermo-structuralanalyses under non-ideal conditions during operation.[Methods]The radiation dose at the beam window wascalculated and analysed using the Monte Carlo method.To evaluate the robustness of BWs during operation,thethermo-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 theradiation dose at 30 cm outside the side walls and ceiling complies with Chinese national standards,verifying theradiation safety of the scheme.Besides,the results indicate that beam eccentricity has negligible effects on thetemperature,stress,and deformation of the beam window.Both beam shrinkage and reduced cooling water flow ratelead to increased temperature,stress,and deformation.[Conclusions]However,the standard deviation of the beamshrinkage must not fall below 10%of its original value,and the cooling water flow rate must not be lower than 0.2m/s;otherwise,the safe operation of the beam window would be compromised.This paper clarifies the safetyoperation threshold for the beam window,providing a theoretical basis for its secure operation.
作者
张浩
黄礼明
林涵文
李磊
赵峰
常仁超
魏建平
朱潇潇
赵禹
陶凯
尉伟
Zhang Hao;Huang Liming;Lin Hanwen;Li Lei;Zhao Feng;Chang Renchao;Wei Jianping;Zhu Xiaoxiao;Zhao Yu;Tao Kai;Wei Wei(Institute of Advanced Light Source Facilities,Shenzhen 518107,China)
出处
《强激光与粒子束》
北大核心
2025年第10期234-240,共7页
High Power Laser and Particle Beams
基金
深圳市科技计划项目(JCYJ20220530140807017)。
关键词
自由电子激光
高重频
束窗
安全性
free electron laser
high repetition frequency
beam window
safety
