螺线管透镜对加速管束流匹配的影响研究  

Effect Research of Solenoid Lens on the Beam Matching of Acceleration Tube

作　　者：张青鵾 王志刚[1] 王永峰[1] 刘超[1] 章勇 王文[1] 王芳[1] 吴宜灿[1] 凤麟团队 ZHANG Qingkun;WANG Zhigang;WANG Yongfeng;LIU Chao;ZHANG Yong;WANG Wen;WANG Fang;WU Yican;FDS Team(Key Laboratory of Neutronics and Radiation Safety,Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences,Hefei of Anhui Prov.230031,China)

机构地区：[1]中国科学院核能安全技术研究所中子输运理论与辐射安全重点实验室

出　　处：《核科学与工程》2019年第6期905-909,927,共6页Nuclear Science and Engineering

基　　金：国家自然科学基金(NO.11805229)

摘　　要：螺线管透镜具有轴对称性、结构尺寸小等优点,在束流传输系统中得到了广泛应用,然而螺线管透镜磁场的非线性部分(像差)会导致束流发射度增长,降低束流的传输效率。本文采用TRACK程序模拟,研究了螺线管透镜像差与束流发射度增长的关系,发现束流发射度的增长与磁透镜的磁感应强度有关,同时优化螺线管透镜的磁场均匀性有效抑制了束流发射度增长。此外,基于一种磁场均匀度较高的螺线管透镜研究了离子源引出系统与加速管的束流匹配过程,结果表明相比汇聚入射束和准平行入射束,发散入射束通过加速管后的束流包络较小,束流发散相对较缓慢。Solenoid lens has been widely used in beam transport systems due to its axial symmetry and relatively small size.However,the aberrations,which are the nonlinear part of the magnetic field of the solenoid lens,lead to the growth of beam emittance,and reduce the beam transmission efficiency.In this paper,the beam emittance growth induced by aberration of solenoid lens was studied by the TRACK code.The results show that emittance growth is related to the magnetic strength of the solenoid lens,and the growth of the emittance can be reduced by optimizing the magnetic field uniformity of the solenoid lens.Meanwhile,the matching process of the extracting beam and the acceleration tube was studied based on the two solenoid lens with high magnetic field uniformity.The results show that,compared with the focused beam and the quasi par-allel beam,the defocused beam has the smaller envelope at the end of the acceleration tube,and the beam divergence is slower.

关 键 词：螺线管透镜 像差 束流发射度 加速管 束流匹配 

分 类 号：TL501.5[核科学技术—核技术及应用]