基于分裂型弯铁的储存环超周期HMBA磁聚焦结构  

Storage Ring Super-Period HMBA Lattice With Split-Bend

作　　者：谭家杰 黄玥靖 许建豪 李为民[1] 白正贺 TAN Jiajie;HUANG Yuejing;XU Jianhao;LI Weimin;BAI Zhenghe(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)

机构地区：[1]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《现代应用物理》2024年第3期64-67,74,共5页Modern Applied Physics

基　　金：国家自然科学基金资助项目(12375325)。

摘　　要：提出了1种使用分裂型弯铁(split-bend)实现的储存环超周期混合型多弯铁消色散(hybrid multi-bend achromat,HMBA)磁聚焦结构(lattice),该结构具有高低β函数值的2种直线节。直线节处较低的β函数值可以提高插入件的辐射亮度,降低插入件对光学函数的影响,而较高的β函数值则可以增大动力学孔径,有利于束流注入。该HMBA lattice使用分裂型弯铁与四极磁铁doublet结构结合形成类triplet结构,在实现高低β函数值直线节的同时,还降低了束流发射度。根据HMBA lattice结构设计了1台能量为3 GeV的衍射极限储存环光源,其自然发射度为101 pm·rad,高β函数值直线节中点处的6D水平动力学孔径约为-8~9 mm,低β函数值直线节中点处的水平与垂直β函数值均小于3.1 m。A storage ring super-period HMBA lattice with split-bend is proposed,which has two different types of straight sections with high and low β.Lower β at the straight sections can increase the radiation brightness of insertion devices and reduce the impact of insertion devices on the optics.And the higher β can enlarge the dynamic aperture,which is beneficial for beam injection.In this HMBA lattice,a split-bend and a quadrupole doublet are combined into a triplet-like structure,which is used to realize high and low β at the straight sections and is beneficial for emittance reduction as well.A storage ring light source with an energy of 3 GeV is designed based on this concept,with a natural emittance of 101 pm·rad.The 6D horizontal dynamic aperture at the middle of high β straight section is approximately-8~9 mm,and the horizontal and vertical β at the middle of low β straight section are less than 3.1 m.

关 键 词：储存环 磁聚焦结构 HMBA 分裂型弯铁 非线性动力学 

分 类 号：TL503[核科学技术—核技术及应用] TL54