储存环逐束团相位测量系统信号处理算法优化

周逸媚; 冷用斌; 许兴懿; 高波; 曹珊珊

doi:10.11884/HPLPB202032.200033

储存环逐束团相位测量系统信号处理算法优化

doi: 10.11884/HPLPB202032.200033

周逸媚^{1, 2,},
冷用斌^{1, 2, 3, ,},
许兴懿^{1, 2},
高波^{2, 3},
曹珊珊^{2, 3}

1.
中国科学院上海应用物理研究所，上海 201800
2.
中国科学院大学，北京 100049
3.
中国科学院上海高等研究院，上海 201204

基金项目: “万人计划”中青年科技领军人才计划项目；国家自然科学基金项目（11575282）

详细信息

作者简介:
周逸媚（1992—），女，博士，研究生，从事加速器逐束团诊断技术研究；zhouyimei@sinap.ac.cn

通讯作者:
冷用斌（1972—），男，博士，研究员，从事加速器逐束团诊断技术研究；lengyongbin@sinap.ac.cn

中图分类号: TL506
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出版历程
- 收稿日期: 2020-02-17
- 修回日期: 2020-04-15
- 刊出日期: 2020-06-24

Signal processing algorithm optimization of bunch-by-bunch phase measurement system for storage ring

Zhou Yimei^{1, 2
,},
Leng Yongbin^{1, 2, 3
, ,},
Xu Xingyi^{1, 2},
Gao Bo^{2, 3},
Cao Shanshan^{2, 3}

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China

摘要

摘要: 为了进一步提高相位测量精度，上海光源束测组在原有逐束团相位测量系统基础上，提出了一种新的信号处理方式——相关函数法。此方法无需对原始束流信号进行低通滤波，通过直接在时域对示波器全部采样点进行模式匹配来计算逐束团相位，其优势在于数据处理仅受仪器带宽限制，可以保留更多的高次谐波信号。研究结果表明，新方法可避免低通滤波带来的束团间信号串扰问题，降低信号反射带来的系统测量误差。主成分分析法被用来评估相位测量分辨率，电荷量越大，分辨率越好。束团间精确的相位依赖关系还可用于储存环束流尾场及阻抗的分析。
- 上海光源 /
- 逐束团相位测量系统 /
- 相关函数法 /
- 匹配查找表 /
- 串扰 /
- 反射
Abstract: To further improve the accuracy of phase measurement, the Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrumentation (BI) Group proposed a new signal processing method, the correlation function method, based on the bunch-by-bunch phase measurement system. This method calculates the bunch-by-bunch phase by performing pattern matching directly on all sampling points of the oscilloscope in the time domain. The advantage is that the data processing is only limited by the oscilloscope bandwidth, and more BPM (Beam Position Monitor) harmonic signals can be retained. The results show that increasing the BPM signal processing bandwidth can effectively remove the crosstalk between bunches and reduce the system measurement error caused by signal reflection. The principal component analysis (PCA) method is used to evaluate the phase measurement resolution, the larger bunch charge, the better the resolution. The precise phase dependence between the bunches can also be used to analyze the beam wake field and impedance in the storage ring.
- Shanghai Synchrotron Radiation Facility /
- bunch-by-bunch phase measurement system /
- correlation function method /
- look-up table /
- crosstalk /
- reflection

HTML全文

图 1 纵向相位测量实验系统框图

Figure 1. Experimental setup for the longitudinal phase measurement

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图 2 单束团模式下不同带宽信号反射大小评估

Figure 2. Reflection evaluation of different bandwidth in single bunch mode

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图 3 束团响应函数构建图

Figure 3. Construction of the response function

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图 4 匹配查找表的其中四组数据

Figure 4. Four groups of matching data in LUT

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图 5 束团实际采样数据与匹配查找表相关性对比

Figure 5. Correlation between measured data and LUT matching data

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图 6 上海光源正常供光模式

Figure 6. Normal filling pattern of SSRF operation

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图 7 逐束团相位与逐圈相位

Figure 7. Bunch-by-bunch phase and turn-by-turn phase of one bunch

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图 8 SVD分解后奇异值分布与主模式时间向量分布

Figure 8. Singular value distribution after singular value decomposition （SVD） and temporal vector distribution of mode 1

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图 9 逐束团相位测量分辨率与电荷量的依赖性

Figure 9. Dependence between bunch phase resolution and charge

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