一种同步辐射水冷晶体机械密封结构的设计  

Design of a mechanical sealing structure for the synchrotron radiation water-cooled crystal

作　　者：宋丽 樊奕辰[1,2] 金利民 徐中民 SONG Li;FAN Yichen;JIN Limin;XU Zhongmin(Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院上海应用物理研究所,上海201800

出　　处：《核技术》2019年第5期17-21,共5页Nuclear Techniques

基　　金：国家自然科学基金(No.11805262;No.U1832172)资助~~

摘　　要：目前,上海同步辐射光源的水冷晶体基本上都是采用胶体粘结方式进行真空密封。在高能同步辐射环境下,胶体易发生失效而带来晶体剥离脱落的风险。为避免这一现象的发生,提出了利用机械夹持机构进行水冷晶体密封的方法。对因机械负载所引起的晶体子午方向的面形误差进行表面面形检测,结果均方根为3.55μrad,可满足实验要求。通过摇摆曲线测试,机械密封结构水冷晶体的半高宽值(Full Width at Half Maximum,FWHM)为11.86″,与原粘结方式下水冷晶体的FWHM值12.24″相比,两者相差约为3%,结果基本一致。此外,还对该机械密封水冷晶体进行了耐水压与检漏等测试,结果表明晶体装配结构的密封性能良好。利用机械夹持进行密封的水冷晶体,既可满足上海同步辐射光源对水冷晶体的性能要求,又可有效避免晶体在工作中剥离脱落事件的发生,从而为光束线的稳定运行提供了必要的保障。[Background] The water-cooled crystals at Shanghai synchrotron radiation facility (SSRF) are currently vacuum sealed by colloid bonding. In high-energy synchrotron radiation environments, the colloid is prone to failure that will cause the crystal to flake off.[Purpose] This study aims to introduce the recommended sealing method to avoid the above risks.[Methods] Water-cooled crystal sealing structure was applied to mechanical clamping mechanism. Experimental tests were conducted to obtain surface error in meridian direction of crystal caused by mechanical load and rocking curve. In addition, the water pressure resistance test and leak detection test of the mechanically sealed water-cooled crystal were carried out.[Results] The slope error of the crystal caused by mechanical load is approximately 3.55 μrad (root mean square) which satisfies the performance requirements. Rocking curve test shows that the value of full width at half maximum (FWHM) of the water-cooled crystal of the mechanical sealing structure is 11.86″ which is nearly the same as the FWHM value of 12.24″ of the water-cooled crystal under the original bonding mode, and the difference is about 3%. The results of water pressure resistance and leak detection tests show that the sealing performance of the crystal assembly structure is pretty good.[Conclusions] The water-cooled crystal sealed by mechanical clamping can meet the performance requirements, and it can effectively avoid the occurrence of peeling off event of crystal during work, and provided the necessary guarantee for the stable operation of beam lines at SSRF.

关 键 词：同步辐射 水冷晶体 密封设计 面形误差 摇摆曲线 

分 类 号：TL99[核科学技术—核技术及应用]