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在电子储存环中，弯转磁铁的场误差、转动误差和四极磁铁的横向位置偏差所产生的二极磁场分量，会导致循环电子的闭合轨道畸变（COD）。以SSRF电子储存环为例，探讨如何利用国际通用加速器程序MAD和RACETRACK进行第三代储存环的闭合轨道畸变校正。首先对SSRF电子储存环闭合轨道校正方案中的校正子和BPM不同安放方案作了比较研究，结果表明，采用每个单元安放10BPM（安在六极磁铁附近），每个普通单元安装8个校正子（水平、垂直方向各4个）的方案是可行的，可以将COD均方根校正到0．1mm以下。并且探讨了弯转磁铁场误差、转动误差和四极磁铁位置偏差、BPM读数误差及校正子误差对COD均方根和校正子最大强度的影响。结果表明，通过闭合轨道畸变校正后，可将SSRF电子储存环的动力学孔径恢复到理想情况下的75％以上。
In the electronic storage ring, the field error, the rotation error and the dipole magnetic field component generated by the lateral position deviation of the quadrupole magnet lead to closed orbit distortion (COD) of the circulating electrons. Taking SSRF electronic storage ring as an example, this paper discusses how to use the global accelerator MAD and RACETRACK to calibrate the closed orbit distortion of the third generation storage ring. First of all, a comparison study of different fixtures and BPMs in the closed orbit correction scheme of the SSRF electronic storage ring was carried out. The results show that each unit is equipped with 10BPM (near the six-pole magnet) Sub (horizontal, vertical direction of the four) program is feasible, you can correct the COD root mean square to 0.1mm or less. The effects of bending magnet field error, rotational error and quadrupole magnet position deviation, BPM reading error and syndrome error on COD root mean square (RMS) and maximum intensity of syndrome were discussed. The results show that the kinetic aperture of the SSRF electronic storage ring can be recovered to more than 75% of the ideal under the correct conditions after correction of the closed orbit distortion.