CHG-SRFEL光学速调管磁极间隙全闭环控制系统

Close-loop control system of the optical klystron magnetic gap of CHG-SRFEL

描述了CHG SRFEL光学速调管磁极间隙全闭环控制系统的原理,给出了系统硬件结构和软件设计。可独立或同步调节光学速调管调制段、色散段及辐射段磁极间隙的大小,分辨率达到20μm,精度达到5μm。通过改进系统位置监测设备,可进一步提高分辨率及精度。系统已经在光学速调管磁场测量、垫补中使用,具有精度高、安全性高、操作方便等特点。

This paper gives a description of the principle of the magnetic gap control system of the optical klystron for the coherent harmonic generation storagering freeelectron laser in the National Synchrotron Radiation Laboratory. The hardware construction and software flowchart are illustrated for reliably engineering implementation of the system. The three parts of optical klystron, modulator, dispersive section and radiator can be adjusted separately or simultaneously, and the resolution can reach 20μm and the precision 5μm. By means of optimizing the position monitoring instrument of the system, the resolution and the precision can be improved to 1.0μm and 0.2μm respectively. The vacuum chamber of the storage ring between the optical klystron is free of destruction by multiprotection system. Such system has been employed in the measuring and shimming of the optical klystron magnetic field.