电子感应加速器励磁线圈的有限元分析  

Finite Element Analysis of Electron Induction Accelerator Excitation Coil

作　　者：邓鸿亮 刘琦[4] 陈海生 邹学钢 钟浩威 彭坤涛 邢吉胜 DENG Hongliang;LIU Qi;CHEN Haisheng;ZOU Xuegang;ZHONG Haowei;PENG Kuntao;XING Jisheng(a.School of Nuclear Science and Technology,East China University of Technology,Nanchang 330013,China;School of Information Engineering,East China University of Technology,Nanchang 330013,China;School of Mechanical and Electronic Engineering,East China University of Technology,Nanchang 330013,China;Engineering Research Center for Nuclear Technology Application,Ministry of Education,East China University of Technology,Nanchang 330013,China;Pan-China Detection Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013 [2]东华理工大学信息工程学院,南昌330013 [3]东华理工大学机械与电子工程学院,南昌330013 [4]东华理工大学核技术应用教育部工程研究中心,南昌330013 [5]泛华检测技术有限公司,南昌330013

出　　处：《能源研究与管理》2023年第1期140-146,共7页Energy Research and Management

基　　金：国家自然科学基金项目(12075055);核能开发科研项目(20201192);核技术应用教育部工程研究中心开放基金项目(HJSJYB2020-4,HJSJYB2019-4)。

摘　　要：励磁线圈作为电子感应加速器的关键组成部分,从电子束注入加速管开始,至电子束打靶产生X射线,其产生的时变磁场贯穿电子束的整个加速过程。励磁线圈控制电子加速过程中磁通量的变化,直接决定了电子感应加速器最终产生X射线的能量与剂量率。为了研究励磁线圈的结构参数对电子感应加速器中电子加速轨道上磁感应强度的影响,采用有限元方法来模拟磁场分布。通过有限元仿真软件研究励磁线圈匝数、半径、层间距、排列结构这四种参数对电子加速轨道上磁感应强度的影响。结果表明:提升线圈匝数、半径均可以增强电子加速轨道磁感应强度。其中线圈匝数每增加2匝,电子加速轨道上磁感应强度提高约3%。线圈半径由3 mm增加到4 mm时,电子加速轨道上磁感应强度增幅最大(0.2%)。线圈层间距为8 mm时,磁感应强度取得最大值0.34106 T。线圈由磁极向外递减排列时,排列结构为10-9-9-7的磁感应强度最大,为0.34097 T。线圈由磁极向外递增排列时,线圈排列结构为7-9-9-10的磁感应强度最大,为0.3412 T。上述分析结果对电子感应加速器励磁线圈的结构优化设计有重要的指导作用与意义。As a key component of the Betatron,the excitation coil starts from the injection of the electron beam into the accelerator tube and ends with the X-ray produced by the electron beam hitting the target,the time-varying magnetic field generated by the excitation coil runs through the whole acceleration process of the electron beam.The change of magnetic flux density in the process of electron acceleration controlled by the excitation coil directly determines the energy and dose rate of the final X-ray produced by the Betatron.In order to study the influence of the structure parameters of the excitation coil on the magnetic flux density on the electron acceleration orbit in the Betatron,the finite element method was used to simulate the magnetic field distribution.The influence of the four parameters as the number of turns,the radius,the layer spacing and the arrangement structure of the excitation coil,on the magnetic flux density on the electron acceleration orbit is studied in detail through the finite element simulation software.The results show that the magnetic flux density on the electron acceleration orbit can be enhanced by increasing the number and radius of coils.The magnetic flux density on the electron acceleration orbit increases by about 3%for every 2 turns of coils.The largest increase in magnetic flux density(0.2%)on the electron acceleration orbit was observed when the coil radius was increased from 3 mm to 4 mm.When the coil layer spacing is 8 mm,the maximum magnetic flux density is 0.34106 T.When the coils are arranged from the magnetic poles outward in decreasing order,the maximum magnetic flux density 0.34097 T is achieved with the arrangement structure of 10-9-9-7.When the coils are arranged from the magnetic poles outward in increasing order,the maximum magnetic flux density 0.3412 T is obtained for the coil arrangement of 7-9-9-10.The above analysis results have an important guiding role and significance for the structural optimization design of the excitation coil of the Betatron.

关 键 词：电子感应加速器 励磁线圈 有限元分析 磁感应强度 

分 类 号：TL5[核科学技术—核技术及应用] O441.4[理学—电磁学]