强激光与粒子束2017，Vol.29Issue(7)：104-108,5.DOI:10.11884/HPLPB201729.170014
DEPU对上海光源储存环的影响与补偿
Compensations of double elliptical polarization undulator effects on the SSRF storage ring
摘要
Abstract
A pair of Apple-Ⅱ type EPU (double elliptical polarization undulators,DEPU) was installed in the SSRF storage ring.The unwanted integral magnetic field errors induced by the devices lead to closed-orbit distortions (COD),tune shifts,coupling variation,reduction of the dynamic aperture and so on.These effects deteriorate the operation performance of the SSRF.Feedforward tables of corrector coils,quadrupoles and skew quadrupoles are used to correct the COD,tune shifts and coupling,respectively.The max COD keeps smaller than 10 μm,the tune shifts keep around 0.001 and the coupling keeps 0.1％.Sextupole strengths were optimized to restore the dynamic aperture,the injection efficiency resumes to more than 80％.In the nearly 4 years operation,the compensations have been working well,and there are still more and more supplements and revisions of the feedforward tables in development for the COD corrections.关键词
椭圆极化波荡器/闭轨畸变/工作点漂移/耦合度/动力学孔径Key words
elliptical polarization undulator/closed-orbit distortion/tune shift/coupling/dynamic aperture分类
能源科技引用本文复制引用
张满洲,王坤,张庆磊,田顺强,姜伯承..DEPU对上海光源储存环的影响与补偿[J].强激光与粒子束,2017,29(7):104-108,5.基金项目
中国科学院青年创新促进会资助项目(2015210) （2015210）
