A new digital beam position and phase measurement implementation based on a field programmable gate array for the high intensity heavy-ion accelerator iLinac.
A new digital beam position and phase measurement implementation based on a field programmable gate array for the high intensity heavy-ion accelerator iLinac.
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DOI：
10.1063/5.0089407
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Fafu Ni;Zhixue Li;J. Wu;Yuan Wei;Xuejing Hu;K. Gu;Ruixia Tian;Yong Zhang;G. Zhu;J. Su;Yanyu Wang
中科院分区：
文献类型：
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作者：
Fafu Ni;Zhixue Li;J. Wu;Yuan Wei;Xuejing Hu;K. Gu;Ruixia Tian;Yong Zhang;G. Zhu;J. Su;Yanyu Wang
为高强度重离子加速器装置的离子直线加速器设计了一种新型数字束流位置和相位测量（BPM）系统。从BPM电极检索基波和二次谐波信号，以同时计算它们各自的射束位置和相位。所有数据采集和数字信号处理算法例程都在现场可编程门阵列（FPGA）中执行。通过同相和正交解调方法获得位置和相位信息。提出了一种简单实用的产生二次谐波参考信号的方法，用于二次谐波信号的处理。可重构滤波器被集成到FPGA中，以允许测量短光束脉冲长度。实验室测试结果表明，当输入信号为-60 dBm和-45 dBm时，相位分辨率分别优于0.2°和0.03°。在输入功率约为-60 dBm时，位置分辨率优于30 μm;在输入功率大于-45 dBm时，位置分辨率可达7 μm。算法的整个执行时间在3.4 µs内完成，这为快速光束联锁信号提供了足够的反应时间到机器保护系统。这种新设计的原型BPM电子学的性能进行了评估与在线质子束。
A new digital beam position and phase measurement (BPM) system was designed for the ion-Linac accelerator at the high intensity heavy ion accelerator facility. The fundamental and second harmonic signals are retrieved from the BPM electrodes to simultaneously calculate their respective beam positions and phases. All data acquisition and digital signal processing algorithm routines are performed in a field programmable gate array (FPGA). The position and phase information are obtained by using the in-phase and quadrature demodulation method. A practical and straightforward method is used to generate the second harmonic reference signal for processing the second harmonic beam signal. The reconfigurable filters are integrated into the FPGA to allow the measurement of short beam pulse length. The laboratory test results show that the achieved phase resolution is better than 0.2° and 0.03° when the input signal is -60 and -45 dBm, respectively. A position resolution better than 30 μm was achieved for an input power level of approximately -60 dBm, and it can reach 7 μm with the input power higher than -45 dBm. The entire execution time of the algorithm is accomplished within 3.4 µs, which provides a sufficient reaction time for the fast beam interlock signal to the machine protection system. The performance of this newly designed prototype BPM electronics was evaluated with the online proton beam.