中国散裂中子源加速器束流引出调试和束损优化  

Beam extraction commissioning and extraction beam loss optimization forChina Spallation Neutron Source accelerator

作　　者：黄明阳[1,2,3,4] 许守彦 齐欣[1,2] 王生 Huang Mingyang;Xu Shouyan;Qi Xin;Wang Sheng(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523808,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Particle Acceleration Physics&Technology,Chinese Academy of Sciences,Beijing 100049,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 [3]中国科学院大学,北京100049 [4]中国科学院粒子加速物理与技术重点实验室,北京100049

出　　处：《强激光与粒子束》2023年第12期48-55,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(12075134);广东省基础与应用基础研究基金项目(2021B1515120021)。

摘　　要：引出系统是中国散裂中子源快循环同步加速器的核心组成部分,对束流精确打靶和加速器稳定运行具有重要意义。首先,详细介绍了快循环同步加速器的引出系统和束流引出方案,重点介绍了一些引出系统相关的关键技术。其次,对引出束流调试进行深入研究,包括纵向束流调试、横向束流调试、引出束流分布优化等,其中纵向束流调试主要针对8个引出Kicker定时进行精确标定,横向束流调试主要指Lambertson型磁铁、8个Kicker磁铁、高能输运线模式的匹配设置。最后,对引出束流束损进行深入研究和针对性优化,探索引出束流损失的各种来源,对Lambertson型磁铁漏场、引出束团长度、Kicker波形平顶、Kicker波形变化进行深入研究并对一些新的测量方法进行详细论述。同时,对Lambertson型磁铁入口产生超大辐射热点的现象进行深入研究,寻找其产生大量束流损失的根源,并提出最终解决方案,降低引出束流损失和辐射剂量,使其满足加速器运行要求。The extraction system is the core component of the Rapid Cycling Synchrotron(RCS)of the ChinaSpallation Neutron Source(CSNS).It is very important for beam striking the target accurately and stable operation ofthe accelerator.In this paper,firstly,the extraction system and beam extraction scheme of the RCS are introduced indetail,with emphasis on some key technologies.Secondly,the extraction beam commissioning is studied in depth,including longitudinal beam commissioning,transverse beam commissioning,and extraction beam distributionoptimization.The longitudinal beam commissioning mainly refers to the accurate calibration of 8 Kickers'timing.Thetransverse beam commissioning mainly refers to the matching settings between the Lambertson magnet,8 Kickermagnets and the beam transport line mode from the RCS to the target.Finally,the extraction beam loss is studied andoptimized in-depth.Various sources of the extraction beam loss are explored.The leakage field of the Lambertsonmagnet,extraction bunch length,flat top of kicker waveform,kicker waveform variation,and so on,are studied indepth.Some new measurement methods are also discussed in detail.At the same time,the phenomenon of super-largeradiation hot spot generated at the entrance of Lambertson magnet is studied in depth to find out the source of the largebeam loss and put forward the final solution to reduce the extraction beam loss and radiation dose,and then make itmeet the requirements of the accelerator operation.

关 键 词：散裂中子源 束流引出 束流调试 束流损失 辐射剂量 

分 类 号：O572.211[理学—粒子物理与原子核物理]