Development of digital beam position monitor system based on pilot tone technology
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摘要: 为改善传统的束流位置测量电子学系统受电子学通道非线性、温度漂移和系统噪声等因素对位置测量精度带来的影响，介绍了一种新型的基于导频技术的数字束流位置测量电子学系统。该系统硬件包括模拟信号采集电子学、数字信号处理电子学和PTC(导频信号耦合)模块；软件包括顶层应用软件和底层驱动，束流信号与导频信号在耦合电路中耦合后，经电子学处理，在FPGA中计算得到归一化后的束流位置信息。实验室测试结果分析，经导频信号归一化处理后能够有效改善各通道随温度变化的现象，束流位置漂移从4.5 μm改善至0.5 μm，分辨率从57.25 nm提升到13.37 nm，并且进行导频信号开关实验更加直观观测导频信号对束流位置测量的在线校正效果。设计的基于导频信号的数字束流位置测量（DBPM）电子学可以高效、实时地实现对加速器束流位置的在线校正，提升电子学系统的实时分辨率性能。Abstract: A new DBPM electronics system based on pilot tone is introduced in this paper to improve the traditional DBPM electronics system which is affected by the non-linearity of electronic channel, temperature drift and system noise.The hardware of the electronics consists of analog signal acquisition electronics, digital signal processing electronics and pilot tone combiner electronics. The software consists of application software and firmware.The beam signal and pilot tone signal are coupled in the pilot tone combiner, and then the combined signal processed by electronic hardware board, and finally calculated by FPGA(Field Programmable Gate Array) to obtain the normalized beam position information. The electronics was tested in the laboratory and it is shown that the normalized pilot tone can effectively educe the measurement variation with temperature of each channel. After normalization, the accuracy the channel changing with temperature is effectively improved. The beam position drift is improved from 4.5 μm to 0.5 μm, and the resolution is improved from 57.25 nm to 13.37 nm. And the pilot tone switching experiment can show intuitively the effect of the pilot signal on the beam position measurement of online correction. The design of DBPM electronics based on pilot tone can realize online correction of beam position measurement efficiently and in real time, and improve the real-time resolution performance of the electronics system.
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图 3 基于导频信号的DBPM电子学系统架构图
Figure 3. Architecture diagram of DBPM electronics system based on pilot tone
表 1 导频信号耦合电路一致性测试
Table 1. Conformance test of PTC circuit
Channel Δ/dB Ch A 20.50 Ch B 20.20 Ch C 20.10 Ch D 20.30 
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表 2 导频信号耦合电路隔离度测试
Table 2. Isolation test of PTC circuit
input
0 dBmoutput/dBm Ch A+PT Ch B+PT Ch C+PT Ch D+PT Ch A −2.02 −85.04 −68.54 −75.45 Ch B −88.73 −1.88 −82.52 −82.92 Ch C −70.07 −80.18 −2.03 −87.42 Ch D −91.33 −82.98 −88.26 −1.87
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