Measurement method for beam position of single pass beam position monitor
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摘要: 针对当前单次通过型数字束流位置探测器（BPM）有效采样点数少、数据信噪比低、测量分辨率差的问题，提出了一种基于“束流单次通过”的数字BPM测量改进算法。该算法通过模拟信号的功分-延迟-合成，增加了有效采样数据，并通过采样数据的截取与数据拼接、数字滤波等数据处理方式，提高了采样数据的信噪比，并最终实现了BPM测量分辨率的提高。实验结果表明，该算法在不改变模数转换器（ADC）采样率的情况下，将单次通过型BPM的测量分辨率提高了约2倍。该测量方法为提高单次通过型BPM的测量分辨率提供了一种新的解决方案，已成功应用于北京正负电子对撞机（BEPCII）和高能同步辐射光源（HEPS）直线加速器项目中。
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关键词:
- 单次通过型束流位置探测器 /
- 模拟信号延迟 /
- 有效采样数据 /
- 数字带通滤波 /
- 分辨率
Abstract: Due to the low effective sampling points, low data signal-to-noise ratio (SNR), and lower measurement resolution in the current single-pass digital Beam Position Monitor (BPM), a digital BPM measurement improvement algorithm for “beam single-pass” case is proposed. This algorithm enhances the effective sampling points by employing the “power division-delay-synthesis” technique for the analog signal. It improves the SNR of the sampling data through various data processing techniques, including data truncation, data concatenation, and digital bandpass filtering (BPF). Consequently, the resolution of the BPM is significantly enhanced. Experimental results demonstrate that this algorithm improves the measurement accuracy of the single-pass BPM by approximately two times without increasing the Analog-to-Digital Converter (ADC) sampling rate. The measurement method studied in this paper presents a novel solution for enhancing the measurement resolution of the single-pass BPM and has been successfully implemented in the Beijing Electron Position Collider II(BEPCII) and High Energy Photon Source (HEPS) linear accelerator projects. -
图 7 一路幅度的求取示意
Figure 7. Schematic diagram for calculating the amplitude of a certain path
图 8 重心法束流位置计算
Figure 8. Calculation of beam position using the center of gravity method
图 9 BPM模拟信号及ADC数据产生过程示意图
Figure 9. Schematic diagram of BPM analog signal and ADC data generation process
图 10 X/Y方向位置分辨及其标准值
Figure 10. X/Y-direction position resolution and its standard value
图 12 实际束流“纯时域求绝对值积分法”测试结果
Figure 12. Test results of the “pure time domain absolute value integration method” for actual beam flow
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