同步加速器脉冲励磁电流质量量化方法  

Quality quantification in pulsed power supply for synchrotron magnet

作　　者：梁毅庆 原有进[2] 王晓俊 申国栋[2] 黄玉珍[2] 李继强[2] 张华剑[2] 高大庆[2] 张翔[2] 杨静 Liang Yiqing;Yuan Youjin;Wang Xiaojun;Shen Guodong;Huang Yuzhen;Li Jiqiang;Zhang Huajian;Gao Daqing;Zhang Xiang;Yang Jing(School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]中国科学院大学核科学与技术学院,北京100000 [2]中国科学院近代物理研究所,兰州730000

出　　处：《强激光与粒子束》2024年第12期80-88,共9页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2019YFA0405402)。

摘　　要：同步加速器中,磁铁励磁电流高频的纹波误差能够引起磁场纹波,进而导致束流接受度降低。励磁电流低频的跟踪误差会影响磁场与束流能量的匹配程度,同时会引起束流闭合轨道畸变。为了从以上两方面评估励磁电流误差对于束流的影响,研究了HIAF BRing二极磁铁磁场纹波与励磁电流纹波之间的关系,并提出了一套基于高低频分离的脉冲励磁电流质量量化方法。该方法利用高斯平滑处理得到励磁电流低频的跟踪误差分量和高频的纹波误差分量,采用三倍标准差作为励磁电流跟踪性能及纹波质量的量化指标。方法中低通滤波器参数由磁铁磁场纹波与励磁电流纹波的响应关系确定,该方法同时准确地量化评估了磁场纹波质量。此外,由该方法得到的电流跟踪误差波形能够应用于同步加速器励磁电源的给定修正,进而提高磁场与束流能量匹配程度。In synchrotrons,the high-frequency ripple error of magnet excitation current causes magnetic field ripple,which leads to decreased beam acceptance.The low-frequency tracking error of the excitation current would affect the matching degree of magnetic field and beam energy,which would cause the closed orbit distortion of the beam.The correlation between magnetic field ripple and excitation current ripple of HIAF BRing dipole magnet is studied in this paper.The current quality quantification methods based on high and low-frequency separation are proposed,which evaluate the effect of excitation current error on the beam.The low-frequency tracking error and high-frequency ripple error of the excitation current are obtained by Gaussian smoothing.Three times the standard deviation is used as the quantification indicator of the excitation current in terms of ripple and tracking error.Since parameters of the low-pass filter are determined by the response relationship between magnetic field ripple and excitation current ripple,this method could accurately quantify the magnetic field ripple.Th current tracking error waveform could be used to adjust the reference waveform of synchrotron pulse power supplies,improving the matching degree of magnetic field and beam energy.

关 键 词：跟踪误差 纹波误差 量化方法 脉冲电源 同步加速器 

分 类 号：TL503.5[核科学技术—核技术及应用]