An improved method of bunch-by-bunch beam position calculation in a heavy-ion synchrotron

An improved method of bunch-by-bunch beam position calculation in a heavy-ion synchrotron
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重离子同步加速器逐束束位置计算的改进方法

DOI:
10.1016/j.nima.2021.165947
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发表时间:
2021-10
期刊:
Nuclear Inst. and Methods in Physics Research, A
影响因子:
--
通讯作者:
Min LI
Min LI
中科院分区:
其他
文献类型:
--
作者:
Xiaojuan Wei;Min LI

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束流位置监测系统是重离子同步加速器轨道校正系统的关键组成部分。逐束团束流位置计算算法是束流位置测量系统的重要组成部分,它决定了束流位置测量的处理速度、精度和分辨率。本文提出了一种基于指数加权滑动平均(EWMA)滤波器的总体最小二乘(TLS)算法,称为EWMA TLS方法,用于估计波束位置。利用该方法对兰州重离子加速器主冷却储存环(HIRFL-CSRm)的BPM信号、实验台的束流信号以及真实的束流信号进行了分析。结果表明,提高了准确性的聚束的位置计算,该方法是更强大的抗噪声比以前的方法,特别是在低信噪比(SNR)的条件下,例如,由于低光束强度。
The beam position monitor (BPM) system is a key element of the orbit correction system of a heavy-ion synchrotron. The bunch-by-bunch beam position calculation algorithm is one of the important parts of the BPM system, which determines the processing speed, accuracy and resolution of the beam position measurement. In this paper, a total least squares (TLS) algorithm based on an Exponentially Weighted Moving Average (EWMA) filter called EWMA TLS method is proposed, which applies to evaluate the beam position. A numerically simulated BPM signal, the signal from a test bench, as well as the real beam signal tested at the main Cooler Storage Ring of the Heavy Ion Research Facility in Lanzhou (HIRFL-CSRm) are analyzed using the new approach. The results demonstrate an improved accuracy of the position calculation of the bunches, and the method is much more robust against noise than previous methods, especially under the condition of a low signal-to-noise ratio (SNR), e.g. due to low beam intensities.
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