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为进一步提升HLS Ⅱ储存环光源的性能以及为未来实现top-off注入打下基础,研制了新的逐束团流强测量系统。系统硬件部分主要由ADC、FPGA和USB构成,采样精度高、架构简单、成本低。由于BPM和信号的峰值含有束团流强信息,该系统利用峰值采样法测流强。在线测试结果表明,束流的纵向振荡对测量精度有较大影响,在开启纵向反馈抑制住纵向振荡时,该系统测量逐束团流强的精度较高,单束团流强的均方根误差值可达0.002 m A;关闭纵向反馈时,测量精度变差。该系统除了测量逐束团流强外,还实现了纵向工作点的测量,未来还可以测量逐束团寿命等,为合肥光源储存环性能提升,提供更多的束流诊断手段。
In order to further enhance the performance of HLS Ⅱ storage ring light source and lay the foundation for future top-off implantation, a new bunch-by-bunch flow measurement system was developed. System hardware is mainly composed of ADC, FPGA and USB, high sampling precision, simple structure and low cost. Since BPM and signal peaks contain beam-group intensity information, the system uses peak sampling to measure the flow strength. The online test results show that the vertical oscillation of the beam has a great influence on the measurement accuracy. When the longitudinal feedback is suppressed by the longitudinal feedback, the accuracy of the system for measuring the cluster-by-cluster flow is high, and the root mean square The error value can reach 0.002 m A; when the longitudinal feedback is turned off, the measurement accuracy deteriorates. In addition to measuring the bunch-by-bunch flow, the system also measures the longitudinal working point. In the future, it can also measure the lifetime of the bunch by bunch, which can provide more diagnostic tools for the beam storage performance improvement.