横向反馈系统数字滤波算法及系统仿真

Digital filter algorithm study and simulation of SSRF feedback system

上海同步辐射装置SSRF(Shanghai Synchrotron Radiation Facility)拟构建现场可编程门阵列(FPGA,Field Programmable Gate Array)数字信号处理模块为基础的横向反馈系统。基于最小二乘法的滤波器设计,能满足横向反馈对增益和相位的特殊要求,优化设计可节省3倍横向反馈功率。本文通过AT(Accelerator Tool)程序仿真,验证滤波器相位偏移特性,及反馈系统增益与横向反馈衰减时间指标之间的计算关系。并进一步研究衰减时间与横向反馈Kicker功率之间的关系。

Least Square Fitting was used to design a FIR filter of the transverse feedback system for the Shanghai Synchrotron Radiation Facility （SSRF）. The algorithm helped us to set appropriate gain and phase at special frequency points. This reduced the power needed for damping the beam oscillations, which was proved by System View signal simulation. And with AT （Accelerator Tool） simulation, the Gain calculation and settings to the output signals from the FIR filter were deduced. The relationship between the Kicker power and the system damping time was also given.