高精度环形谱仪等时性模式的闭轨校正模拟  

Closed Orbit Correction for the Isochronous Mode of Spectrometer Ring

作　　者：王耿[1,2] 杨建成 夏佳文[1] WANG Geng;YANG Jiancheng;XIA Jiawen(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《原子核物理评论》2019年第4期419-425,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11375243);广东省引进创新创业团队计划资助项目(2016ZT06G373)~~

摘　　要：高精度环形谱仪(SRing)是HIAF装置的重要组成部分,闭轨校正设计是该同步加速器设计的关键部分。由于等时性模式(γt=1.43)线性光学水平β函数很大,磁铁场误差及安装误差会引起较大的闭轨畸变,并导致线性光学发生变化。模拟过程采用奇异值分解(SVD)算法,通过多次计算响应矩阵并计算校正铁校正量实现闭轨校正。同时考虑BPM误差的影响,并通过减少特征值使用个数降低校正铁校正量。校正后全环最大闭轨小于0.8 mm,线性光学也得到明显优化。The Spectrometer Ring(SRing),which is an important component of the High Intensity heavy-ion Accelerator Facility(HIAF),has to be optimized for the closed orbit correction system.Since the maximum horizontalβfunction of the isochronous mode(γt=1.43)is very large,the field imperfections and alignment deviations of the magnets will cause large closed orbit distortion(COD),which will result in the distortions of linear optics.Therefore,the closed orbit correction is critical to the operation of SRing.In the simulations,the Singular Value Decomposition(SVD)algorithm is adopted.The repeated correction method is applied and the response matrices are multi-calculated before each correction.The influences of BPM reading errors are analyzed.In addition,the effects of reduced singular values are analytically expressed and simulated.As a result,the closed orbits are corrected to be less than 0.8 mm,and the linear optics is also well optimized.

关 键 词：SRing 闭轨 SVD 

分 类 号：O571.53[理学—粒子物理与原子核物理]