CSNS-Ⅱ靶站质子束窗结构设计与优化分析  

Structure design and optimization analysis of proton beamwindow in target station for CSNS-II

作　　者：王广源[1,2] 刘磊 刘仁洪 康玲[1,2] 张俊嵩 宁常军[1,2] 余洁冰 陈佳鑫[1,2] Wang Guangyuan;Liu Lei;Liu Renhong;Kang Ling;Zhang Junsong;Ning Changjun;Yu Jiebing;Chen Jiaxin(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]散裂中子源科学中心,广东东莞523803

出　　处：《强激光与粒子束》2023年第12期82-88,共7页High Power Laser and Particle Beams

基　　金：集主动减振技术的大行程纳米调姿系统研究基金项目(12105308)。

摘　　要：中国散裂中子源(CSNS)靶站质子束窗位于环到靶站输运线(RTBT)与靶站交接面,起到隔离加速器高真空和靶站氦气环境的作用。随着束流功率提高,目前质子束窗单层膜结构形式已无法满足CSNS-Ⅱ500 kW的高功率需求,因此开展CSNS-Ⅱ质子束窗研制,设计出双层膜中间通水的冷却结构,完成质子束窗双层膜的薄膜半径、薄膜厚度、水冷槽长度与宽度、对流换热系数等各参数对质子束窗温升与热应力的影响分析。通过冷却水需求分析得出,冷却水流速需大于15 L/min。通过质子束窗主体的流固耦合分析,消除箱体内部死水区域。最终优化后质子束窗薄膜位置最高温度47.8℃,薄膜位置最高热应力30.758 MPa。通过FLUKA软件对质子束窗材料的辐照损伤性能进行分析,在每年5000 h工作时长、500 kW高功率束流的辐照下,辐照损伤DPA计算值为1.285 DPA,质子束窗的安全使用寿命在7年以上。The proton beam window of the CSNS target station is located at the interface between theRing to Target Beam Transport(RTBT)line and the target station,which can isolate the high vacuum of theaccelerator and the helium environment of the target station.With the increase of the beam power of CSNS-II,thesingle-layer film structure of the proton beam window can no longer meet the high power of 500 kW,so the upgradingand development of the CSNS-II proton beam window are carried out.The structure design of the CSNS-II protonbeam window is emphasized,and the cooling structure with water in the middle of the double-layer membrane isdesigned.The influence of the parameters of proton beam window,such as film radius,film thickness,length andwidth of water cooling tank,and convection heat transfer coefficient,on the temperature rise and thermal stress of theproton beam window was analyzed.Analysis on cooling water demand shows that the cooling water flow rate shouldbe greater than 15 L/min.Through the fluid structure coupling analysis of the main body of the proton beam window,the dead water area inside the box is eliminated.The maximum temperature of the optimized proton beam windowfilm is 47.8℃.The maximum thermal stress at the film position is 30.758 MPa.The radiation damage performance ofproton beam window material is analyzed by FLUKA software.Under the irradiation of 5000 h of operation per yearand 500 kW high power beam current,the calculated value of DPA of radiation damage per year is 1.285 DPA,andthe life of proton beam window is more than 7 years.

关 键 词：质子束窗 热分析 流固耦合分析 辐照损伤 

分 类 号：TL99[核科学技术—核技术及应用]