高能同步辐射光源中基于四层滑动导轨的磁铁在线调节机构研制

Development of the Mover based on the Four-layer Sliding Guide in HEPS

在高能同步辐射光源(HEPS)储存环中,基于束流光学参数校正的需要,所有的六极磁铁将安装在基于束流位置进行远程电动调节的机构上。HEPS六极铁在线调节机构需要在高负载下实现超高精度和稳定性,研制难度较大,前期进行方案设计和样机研制有利于为工程实施建立坚实的基础。本文对基于四层滑动导轨的调节机构进行样机研制和测试,探索提高运动精度和减小运动姿态角度误差的加工和装配工艺方法,以准确掌握该方案调节机构的性能,包括线性运动精度、运动姿态角度误差和磁铁支撑系统稳定性。经测试,在450 kg六极磁铁负载下,该调节机构在磁轴位置高度上的运动精度好于5μm;调节机构沿运动轴的俯仰角误差≤2″,摇摆角和滚动角误差≤3″;安装调节机构后磁铁支撑系统的整体固有频率>54 Hz。实测结果表明,基于四层滑动导轨的磁铁在线调节机构最终能达到所需的线性运动精度和运动姿态角度误差要求,且其高刚度特点可以满足HEPS磁铁支撑系统高稳定性的要求。但是,板件之间巨大的滑动摩擦会在运动过程中带来非运动方向的位移耦合,该耦合量需要根据束流的物理需求进行评估。

In the storage ring of HEPS,all sextupoles will be installed on Beam Based Alignment Mover for beam optical correction.HEPS Mover needs to achieve high precision and be with high stability under high load.It is essential to develop the prototype before project implementation.A prototype of Mover based on the four-layer sliding guide has been developed to explore the processing and assembly process methods and tested to realize its performance,including the motion accuracy,angle error and stability of the magnet support system.Under 450 kg load of sextupoles,the motion accuracy of the Mover is higher than 5μm.The pitch,roll and yaw along the Mover motion is better than 2-3".The overall natural frequency of the magnet support system after installing the Mover is higher than 54 Hz.Through the test,the performance of the four-layer sliding guide Mover is definite.and the characteristics of high stability of the sliding scheme are determined.The measured results show that the four-layer sliding guide Mover can finally reach the required absolute accuracy and attitude angle.However,the huge sliding friction between the sliding plates will still bring the coupling in the beginning of vertical motion.