摘要
储存环标准单元的预准直是高能同步辐射光源(HEPS)项目建设的关键环节,为后续储存环设备在隧道内的顺利安装提供了重要保障。介绍了HEPS储存环标准单元预准直的相关工作。为了实现储存环磁铁设备的高精度预准直,采用了基于激光跟踪仪的四路边长法测量系统,用于测量及实时监测磁铁位置偏差。同时,详细介绍了支架调平及标定方法、单元预准直理论值的计算方法、六极铁及其调整装置的准直方案,以及常规磁铁的准直方案。通过制定标准化作业流程,实现了预准直工作的批量化操作。目前,288台标准单元的预准直工作已全部完成,预准直精度优于10μm。
Objective The circumference of the high energy photon source(HEPES)storage ring is about 1360 m,with 288 girders(96 threemagnet girders,96 fivemagnet girders,and 96 eightmagnet girders)and 1776 magnets.In order to improve the installation efficiency of the storage ring,each girder is usually first prealigned in the laboratory,and then transported to the storage ring to participate in the tunnel alignment.Based on simulation and physical design of the accelerator,the standard deviation for the prealignment adjustment of magnets on one girder in transverse and vertical directions must be below 10μm.Methods To efficiently complete the prealignment work of HEPES and simultaneously ensure the prealignment accuracy,a fourstation laser tracker multilateration measurement system is used for measuring and realtime monitoring the magnet position deviation.The ranging accuracy of laser trackers is much better than that of angle measurement.The multilateration measurement system uses four laser trackers to measure the distance to the target point on every magnet,and a rankdefect freenetwork adjustment model is used to solve the coordinates of the station and target points.The multilateration measurement system can avoid the errors of angle measurement of laser trackers,thus obtain a highprecision result.In order to improve the work efficiency for prealignment,a standardized operating process is established,including girder fiducialization and calculation of the theoretical values of prealignment,sextupole magnet and mover alignment,and conventional magnet alignment.In order to reduce the residual error of beam correction and improve the dynamic aperture,a sextupole magnet mover is developed to perform beambased alignment online.The mover can realize transverse and vertical motions.Therefore,it is necessary to align the movement direction of the mover until it is parallel to the corresponding direction of the coordinate axis,and then carry out the alignment of the sextupole magnet.Since there is no elevation adjustment mechanism between mover and sextupole magnet,it is determined that the mover can be fixed on the girder directly and the shims are inserted in the interface of magnet and mover using a special lifting fixture to adjust the flatness errors.Results and Discussions Three work stations are built in the laboratory for prealignment.All work stations are designed to accomplish alignment of all three girders.Through the continuous optimization of the prealignment process,the prealignment efficiency for the threemagnet girder and the fivemagnet girder are 0.5 d per girder and 1 d per girder,respectively.For the eightmagnet girder,three sextupole magnets and the mover need prealignment after the five conventional magnets are completed.The motion direction of the mover is made parallel to the theoretical direction by the lateral adjustment mechanism of the mover,and then the error in the elevation direction of the sextupole magnet is adjusted to within 10µm by insertion of shims(Fig.9).This pre-alignment scheme for the sextupole magnet and the mover has good results in practice,and the time taken to prealignment each eightmagnet girder is reduced from 5 d per girder at the beginning to 1 d per girder.The multilateration measurement scheme adopted for prealignment can be adjusted according to the size of the target to be measured and the size of the environment,so as to meet the needs for highprecision measurement and adjustment of different equipments.Conclusions In the actual prealignment process through continuous exploration,one needs to sum up standardized operating procedures of the storage ring unit precollimation,prepare the precollimation process control table,and strictly control the precollimation process and the results of each unit.In the end,288 standard girders are prealigned on time with an accuracy of better than 10μm.It shows that the prealignment process is reasonable and the accuracy of the measurement scheme meets the requirements.The alignment accuracy of the multilateration system can still be improved by increasing the height difference of four stations.Furthermore,this laser trackerbased multilateration method can be applied to other high precision fields,for example,the field of industrial measurement.
作者
卢尚
门玲鸰
王梓豪
李春华
梁静
王铜
杨澍
陈思雨
刘晓阳
张露彦
韩圆颖
闫皓月
闫路平
王小龙
马娜
何振强
柯志勇
李波
何晓业
董岚
Lu Shang;Men Lingling;Wang Zihao;Li Chunhua;Liang Jing;Wang Tong;Yang Shu;Chen Siyu;Liu Xiaoyang;Zhang Luyan;Han Yuanying;Yan Haoyue;Yan Luping;Wang Xiaolong;Ma Na;He Zhenqiang;Ke Zhiyong;Li Bo;He Xiaoye;Dong Lan(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,Anhui,China;Dongguan Neutron Science Center,China Spallation Neutron Source,Dongguan 523803,Guangdong,China)
出处
《中国激光》
北大核心
2025年第11期1-9,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(12075264)
粤莞联合基金青年项目(DG22311522)。
关键词
高能同步辐射光源
预准直
边长法
坐标系转换
high energy synchrotron radiation source
prealignment
multilateration method
coordinate system conversion
