数字束流位置信号处理算法优化

Optimization of signal processing algorithm for digital beam position monitor

在已有束流位置信号下变频算法的设计与实现的基础上,优化了算法时序,设计实现了数字自动增益控制、慢应用信号处理等模块功能,能获得逐圈、快应用及闭轨数据。上海光源储存环上的束流测试结果显示,处理器可正确获取包含束流真实运动的多速率位置数据。在174mA储存环流强、500个束团的填充模式时,逐圈位置数据分辨力达到0.84μm,快应用位置数据分辨力达到0.44μm,闭轨位置数据分辨力达到0.23μm,性能满足设计要求。

Based on turn-by-turn （TBT） signal processing, the paper emphasizes on the optimization of system timing and implementation of digital automatic gain control, slow application （SA） modules. Beam position including TBT, fast application （FA） and SA data can be acquired. On-line evaluation on Shanghai Synchrotron Radiation Facility （SSRF） shows that the processor is able to get the multi-rate position data which contain true beam movements. When the storage ring is 174 mA and 500 bunches filled, the resolutions of TBT data, FA data and SA data achieve 0.84, 0.44 and 0.23μm respectively. The above re sults prove that the design could meet the performance requirements.