Feedforward compensation of the insertion devices effects in the SSRF storage ring

作     者：Xin-Zhong Liu Shun-Qiang Tian Xu Wu Meng Wang Zhen-Tang Zhao Bo-Yuan Feng Xin-Zhong Liu;Shun-Qiang Tian;Xu Wu;Meng Wang;Zhen-Tang Zhao;Bo-Yuan Feng

作者机构：University of Chinese Academy of SciencesShanghai 201800China Shanghai Institute of Applied PhysicsChinese Academy of SciencesBeijing 100049China Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai UniversityShanghai 200444China Tsinghua UniversityBeijing 100084China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2022年第33卷第6期

页      面：34-44页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0702[理学-物理学] 

基　　金：supported by the Key Program of Shanghai Science and Technology Innovation Center(No.1174000565)。 

主　　题：Shanghai Synchrotron Radiation Facility(SSRF) Insertion devices(IDs) Closed-orbit distortion Tune shift Coupling Feedforward 

摘      要：The lattice of the Shanghai Synchrotron Radiation Facility(SSRF) storage ring was upgraded in the Phase-II beamline project, and thus far, 18 insertion devices(IDs) have been installed. The IDs cause closed-orbit distortions, tune drift, and coupling distortions in the SSRF storage ring, all of which are significant issues that require solutions. In this study, an ID orbit feedforward compensation system based on a response matrix using corrector coils was developed, and it was applied to all commissioned IDs in the SSRF storage ring. After correction, the maximum ID-induced horizontal and vertical orbit distortions were less than 5.0 and 3.5 μm, respectively. Some interesting phenomena observed during the measurement process were explained. Additionally, optical and coupling feedforward systems were developed using quadrupole and skew quadrupole magnets installed on the front and back of elliptically polarizing undulators(EPUs). Moreover, over nearly four months of operation, the developed strategy delivered a satisfactory performance in the SSRF storage ring.