HEPS储存环真空系统研制  

Research and Development of the HEPS Storage Ring Vacuum System

作　　者：董海义[1] 何平[1] 李琦[1] 郭迪舟[1] 王徐建 马永胜[1] 刘佰奇[1] 黄涛[1] 张磊[1] 孙飞 刘天锋 田丕龙 杨雨晨 杨奇[1] 王鹏程[1] 刘佳明[1] 刘顺明 孙晓阳 朱邦乐 谭彪 DONG Haiyi;HE Ping;LI Qi;GUO Dizhou;WANG Xujian;MA Yongsheng;LIU Baiqi;HUANG Tao;ZHANG Lei;SUN Fei;LIU Tianfeng;TIAN Pilong;YANG Yuchen;YANG Qi;WANG Pengcheng;LIU Jiaming;LIU Shunming;SUN Xiaoyang;ZHU Bangle;TAN Biao(Institute of High Energy Physics,CAS,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《真空》2025年第2期1-11,共11页Vacuum

基　　金：高能同步辐射光源国家重大科技基础设施项目(发改高技【2017】2173号)。

摘　　要：高能同步辐射光源(High Energy Photon Source,HEPS)是束流能量为6 GeV、流强为200 mA的第四代光源。HEPS加速器由直线加速器、增强器、储存环和将这三者连接在一起的三条输运线组成,其中储存环是HEPS的核心部分。本文概述了储存环真空系统的特点,并对一些关键部件的设计和工艺进行了说明。储存环真空系统设计的主要技术难点是研制挤压成型的薄壁铬锆铜真空盒并在其内表面镀吸气剂膜,以解决真空盒上同步辐射光热沉积大和真空盒(内径22 mm)流导受限的问题。目前已完成所有真空部件的生产,储存环真空系统于2023年11月开始正式安装,并于2024年7月完成。通过对真空系统分段在线烘烤和吸气剂膜激活,其平均静态真空达到5×10^(-8) Pa,优于设计指标。这标志着HEPS储存环真空系统成功实现了从真空盒、RF屏蔽波纹管、光子吸收器等非标设备的设计加工到磁控溅射镀吸气剂膜、现场安装以及吸气剂膜的在线激活等各个技术环节的闭环验证。经历20余天的试运行,HEPS储存环流强达到12 mA,HEPS加速器取得了里程碑式进展。HEPS(high energy photon source)is the 4th generation ring-based light source with a beam energy of 6 GeV and a beam current intensity of 200 mA.The HEPS accelerator consists of a linac,a booster,a storage ring,and three transport lines connecting them together.The storage ring serves as the core region of HEPS.In this paper,the characteristics of the storage ring vacuum system are reviewed,and the design and fabrication approach for some key vacuum components are detailed.The main challenges include extruding thin-walled CrZrCu vacuum chambers and coating NEG films on their inner surfaces.These are used to mitigate substantial heat loads induced by synchrotron radiation along the vacuum chamber walls and provide an effective pumping speed for conductance-limited vacuum pipes with an inner diameter of 22 mm.At present,the procurement of all the vacuum components has been completed.The installation of the storage ring vacuum system started in November 2023,and finished in July 2024.Vacuum sectors were baked and activated in-situ for the NEG films inside the vacuum chambers,an average static pressure of 5×10^(-8) Pa has been reached,which is better than the specification.The results verify the feasibility of the storage ring vacuum system from the design and fabrication of vacuum chambers,RF shielding bellows,photon absorbers,etc.to NEG coating with magnetron sputtering,installation,activation of NEG films in-situ,etc.After more than 20 days of conditioning,the beam current of the HEPS storage ring reached 12 mA,marking a milestone progress in the HEPS accelerator.

关 键 词：高能同步辐射光源 真空盒 RF屏蔽波纹管 光子吸收器 NEG镀膜 

分 类 号：TL50[核科学技术—核技术及应用]