运动控制系统是上海光源(SSRF)X射线小角散射(SAXS)实验站建设的重要组成部分,该控制系统通过对实验站运动部件的远程精确控制来实现对光斑的准直调节和寻找最佳的散射实验样品放置位置,以满足不同用户的实验环境要求。该系统采用国际加速器控制界称为“标准模型”的分布式控制体系结构,应用EPICS软件实现了对实验站的23个运动部件的远程运动控制,被控设备包括两个四刀口单色光狭缝及其三维狭缝支撑平台、七维样品台和两个Beam-Stop。运动测试结果表明:系统的运动分辨率最大为20 μm,最小为0.333 33 μm,运动误差约为1%。测试结果满足小角散射实验站运动控制的要求,具有高的稳定性、可重复性和精度。目前该系统已成功应用于SSRF-SAXS实验站的调试运行。

The motion control system of moving components in the Shanghai Synchrotron Radiation Facility (SSRF) Small-angle X-ray Scattering (SAXS) station is an important part of the facility construction,which is applied to accommodate light spots and find the best position of the scattering sample to satisfy the different experiment demands of the users.The system is a distributed control system recognized as the “standard model” in large accelerator laboratories in the world and is developed based on the large-scale software EPICS (Experimental Physics and Industrial Control System).It implements controls for 23 moving components of two four-jaw slits,two slit-bases,a sample-stage and two Beam-Stops.The moving test results indicate that the resolutions of moving components are from 0.333 33 μm to 20 μm and the error is about 1%.The test results can satisfy the requirements of the SAXS station and show advantages in the stability,repeatability and higher precision of the system.Now,the system has been successfully applied to debugging and running in the station.