高能同步辐射光源快速轨道反馈系统数据分发方案设计与实现

Design and implementation of data transmission of fast orbitfeedback system for HEPS

作为第四代同步辐射光源,高能同步辐射光源对束流轨道稳定性提出了极高的要求,即在500 Hz左右带宽范围内,储存环中束流轨道的水平和垂直方向稳定度要优于该方向束团均方根尺寸的10%。为实现上述目标,快速轨道反馈系统的延时要尽可能低。快速轨道反馈系统将束流位置监测器(BPM)数据从BPM电子学接收并分发至所有子站,其数据传输延时是系统的主要延时。对此,设计并实现了一种基于高性能现场可编程逻辑门阵列(FPGA)和高速收发技术的数据分发方案,来满足快速轨道反馈系统的低延时和高带宽的需求。经过验证平台的搭建与测试,系统数据分发总延时小于10μs,且24 h内未出现误码,满足高能同步辐射光源快速轨道反馈系统的需求。

High Energy Photon Source(HEPS),as a 4^(th) generation synchrotron radiation light source,hasstringent requirement for beam orbit stability:the orbit fluctuations should be below 10%of the beam RMS sizes inboth horizontal and vertical directions with a bandwidth around 500 Hz.Overall,the latency of the Fast OrbitFeedBack(FOFB)system is the key factor to achieve the requirement.Data transmission of the beam positions fromthe beam position monitor(BPM)electronics to all of the FOFB sub-stations is the key to achieve very low latency,aswhich contributes the largest part of the total FOFB system latency.Preliminary test results of prototype showed thatthe total latency of data transmission is less than 10μs with no bit errors during data transmission,satisfying therequirements on the FOFB system of HEPS.