基于八极磁铁的束流均匀化设计方法  

Design Method of Beam Homogenization Based on Octupole Magnet

作　　者：杨新宇 郭刚[1] 彭朝华[1] YANG Xinyu;GUO Gang;PENG Zhaohua(Department of Nuclear Physics,China Institute of Atomic Energy,National Innovation Center of Radiation Application:Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核物理研究所,国防科技工业抗辐照应用技术创新中心,北京102413

出　　处：《现代应用物理》2022年第3期64-69,124,共7页Modern Applied Physics

基　　金：国家自然科学基金项目(11690044)。

摘　　要：随着单粒子效应研究的深入,地面模拟实验对大面积均匀束斑的需求也在逐渐增加。基于八极磁铁束流均匀化的原理,提出了单八极磁铁均匀化、集中均匀化和交替均匀化3种不同的束流均匀化设计方案,采用Transport和Turtle程序分别计算了3种设计方案的束流线参数及均匀化效果。理论分析和模拟计算的结果均表明,交替均匀化方案,即四极磁铁和八极磁铁相间排列,用2个四极磁铁使束流在x和y方向分别成腰,2个八极磁铁放置在束流成腰位置时均匀化效果最好,理想状况下,束流利用率可达到65%。Based on the principle of beam homogenization of octupole magnet,three different beam homogenization design schemes of single octupole magnet homogenization,centralized homogenization,and alternating homogenization are proposed in this paper.The beam line parameters and homogenization effects of the three design schemes are calculated by using Transport and Turtle programs,respectively.The results of theoretical analysis and simulation calculation show that the alternating homogenization scheme,that is,quadrupole magnets and octupole magnets are arranged alternately.Two quadrupole magnets are used to make the beam waist in the x and y directions,respectively.When two octupole magnets are placed at the waist position of the beam,the homogenization effect is the best.Under the theoretical condition,the beam utilization rate can reach 65%.

关 键 词：单粒子效应 八极磁铁 束流均匀化方法 均匀性 

分 类 号：O572[理学—粒子物理与原子核物理] TL99[理学—物理]