束内散射效应下HALF储存环物理参数的优化设计  

Parameters optimization considering intra-beam scattering in HALF lattice design

作　　者：罗楚文 刘刚文 李伟伟 胡楠 李为民 白正贺 王琳 Luo Chuwen;Liu Gangwen;Li Weiwei;Hu Nan;Li Weimin;Bai Zhenghe;Wang Lin(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,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260029

出　　处：《强激光与粒子束》2022年第10期33-39,共7页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2016Y-FA0402000);国家自然科学基金青年科学基金项目(12005226);国家自然科学基金面上项目(11475167)。

摘　　要：合肥先进光源(HALF)是我国规划建设的软X射线与VUV衍射极限储存环光源(DLSR)。如何有效地实现衍射极限束流发射度,是DLSR物理设计中的核心问题之一。基于束流发射度演化方程,针对HALF预研项目的储存环物理设计方案,计算了束内散射(IBS)效应带来的发射度增长,研究了DLSR中关键参数选择对IBS造成的发射度增长的影响。研究表明,在中低能DLSR物理设计中需要综合考虑储存环的周长、同步辐射阻尼时间等关键参数,以更好地抑制束流发射度的增长。在此研究基础上,通过综合考虑用户需求与储存环物理要求,提出了HALF当前工程项目的储存环物理设计方案。进一步综合应用束团拉伸、全耦合等措施后,更高效地抑制了HALF储存环内IBS造成的束流发射度增长。Hefei Advanced Light Facility(HALF) is aimed to be a world-class diffraction limited storage ring(DLSR) in the soft X-ray & VUV regime. The characteristics and law of beam emittance evolution due to intrabeam scattering(IBS) in HALF storage ring was studied based on equations of equilibrium emittance. The results show that, it is necessary to comprehensively optimize the key parameters to obtain excellent beam performance in physical design of middle to low-energy DLSR. Applying the key parameters optimization strategy and taking methods to release the emittance growth due to IBS into consideration, the new version of HALF lattice can meet the needs of soft X-ray diffraction limit.

关 键 词：衍射极限储存环 合肥先进光源 亮度 束内散射 发射度增长 

分 类 号：TL503[核科学技术—核技术及应用]