CSRm束流累积阶段闭轨校正系统设计

为测量兰州重离子加速器冷却储存环主环(CSRm)束流累积阶段的闭轨畸变并进行闭轨校正，开发了闭轨校正系统，该系统由轨道测量系统、闭轨控制系统和校正磁铁系统构成。轨道测量系统实现对束流轨道的实时监测；闭轨控制系统读取束流轨道信息，然后进行闭轨校正计算，并将计算后的校正值传输给校正磁铁系统；校正磁铁系统通过改变校正电源的值，改变校正磁铁的强度，实现对束流轨道的调整，完成闭轨校正。模拟测试结果表明，束流轨道水平方向的最大畸变由校正前的3.37 mm减小为校正后的0.39 mm，垂直方向的最大畸变由校正前的4.21 mm减小为校正后的0.31 mm。该系统能够实现响应矩阵的自动测量和束流轨道的自动校正，满足设计要求。

Design of closed orbit correction system for beam accumulation stage of CSRm

To measure the closed orbit distortion of the beam in Lanzhou Heavy Ion accelerator Cooling Storage Ring main ring (CSRm) and perform closed orbit correction, the authors have developed a closed orbit correction system. It consists of an orbit measure system, a closed orbit control system and a corrector magnet system. The orbit measure system realizes real-time monitoring of the beam orbit; the closed orbit control system reads the orbit information, performs the closed orbit correction calculation, and transmits the calculated correction value to the corrector magnet system; the corrector magnet system changes the intensity of the corrector magnet by changing the settings of the corrector power supply, thereby realizing the adjustment of the beam orbit. The simulation test show that the maximum distortion in the horizontal direction is reduced from 3.37 mm to 0.39 mm, and the maximum distortion in the vertical direction is reduced from 4.21 mm to 0.31 mm. The system can measure the response matrix and correct the beam orbit automatically. It meets the design requirements.