合肥光源横向反馈系统的改进与试验结果
Update and experiment results of Hefei light source transverse feedback system
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摘要: 介绍了在合肥光源横向模拟反馈样机系统进行的改造和升级。主要包括前端束流位置信号处理模块的重建和与直流成分剔除单元模块。同时还进行了信号矢量合成模块的优化与改造、增加独立可调增益模块以及优化信号传输线路在内的重要改进。对改进后的反馈系统进行了抑制耦合束团不稳定性试验，相关试验数据分析结果表明，反馈系统提供的注入阻尼率提高了一个数量级。Abstract: The transverse analog feedback system of Hefei light source has been redeveloped. The new improved designs including beam position signal processing unit, DC-component signal removing unit, vector signal computing unit, etc, are described and new system’s commissioning results are discussed. The transverse coupled bunch instability at 200 MeV injection status is experimentally studied. The results show that, the injection damping rate is improved from 1.22 ms to 0.16 ms and the remnant beta oscillation can be suppressed.
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Key words:
- feedback system /
- vectorial resultant /
- damping rate /
- sideband
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