消色散270°偏转磁铁系统设计及束流动力学研究

李佳; 赵全堂; 冉朝晖; 龙渊铭; 宗阳; 李宇伦; 曹树春; 申晓康; 张子民; 袁平

doi:10.11884/HPLPB202234.220180

消色散270°偏转磁铁系统设计及束流动力学研究

doi: 10.11884/HPLPB202234.220180

李佳^{1, 2,},
赵全堂^{1, 2, ,},
冉朝晖¹,
龙渊铭¹,
宗阳¹,
李宇伦^{1, 2},
曹树春^{1, 2},
申晓康^{1, 2},
张子民^{1, 2},
袁平^{1, 2}

1.
中国科学院近代物理研究所，兰州 730000
2.
中国科学院大学核科学与技术学院，北京 100049

基金项目: 中科院STS项目(E12E701Y)；甘肃省自然科学基金项目(21JR7RA103)；核能开发科研(冷链病毒消杀)项目(HNKF2021001)

详细信息

作者简介:
李　佳，lijia@impcas.ac.cn

通讯作者:
赵全堂，zhaoquantang@impcas.ac.cn

中图分类号: TL53
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-02
- 修回日期: 2022-07-20
- 录用日期: 2022-08-12
- 网络出版日期: 2022-11-02
- 刊出日期: 2022-11-02

Design and beam dynamic analysis of 270° achromatic deflection magnet system

Li Jia^{1, 2
,},
Zhao Quantang^{1, 2
, ,},
Ran Zhaohui¹,
Long Yuanming¹,
Zong Yang¹,
Li Yulun^{1, 2},
Cao Shuchun^{1, 2},
Shen Xiaokang^{1, 2},
Zhang Zimin^{1, 2},
Yuan Ping^{1, 2}

1.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
College of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 对三种常用结构的270°偏转磁铁进行系统的分析研究，采用数值计算和模拟方法对双磁铁不对称偏转结构、三块90°磁铁偏转结构和70°+130°+70°偏转结构这三种不同的270°偏转磁铁系统进行模拟，给出偏转系统的消色散传输条件，并且分析了束流包络在偏转系统和出口管道中的变化情况。经过分析对比，详细列出了三种结构的优势与劣势。双磁铁不对称结构适用于医用加速器，三块90°磁铁偏转结构适用于需要在出口长距离漂移的辐照加速器，而70°+130°+70°偏转结构可以满足出口一定距离的无损漂移，同时实现相对较低的成本，是工业辐照加速器较为经济适宜的选择。
- 工业辐照电子加速器 /
- 270°磁铁偏转系统 /
- 束流动力学优化 /
- 消色散传输 /
- 射束偏转
Abstract: The 270° beam deflection system with magnets is widely used in medical electron linear accelerators and high-energy electron industrial irradiation accelerators. In this paper, three common structures of 270° deflection magnet are systematically analyzed and discussed. Numerical calculation and simulation methods are used for the two-magnet asymmetric deflection structure, the three 90° magnets deflection structure and the 70°+130°+70° deflection structure. The achromatic transmission conditions of the deflection systems are given, and the changes of beam envelope in the deflection and exit beam line are analyzed. After analysis and comparison, the advantages and disadvantages of the three structures are listed in detail, which has certain guiding significance for the selection of structures in specific application fields. The two-magnet asymmetric deflection structure is suitable for medical accelerators. The three 90° magnets deflection structure is suitable for irradiation accelerators that require long-distance drift at the exit. The 70°+130°+70° deflection structure can satisfy the non-destructive drift of a certain distance from the exit, and it achieves relatively low cost, therefore, it which is a more economical and suitable choice for industrial irradiation accelerators.
- industrial irradiation electron accelerator /
- 270° magnet deflection system /
- beam dynamics optimization /
- achromatic transmission /
- beam deflection system

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图 1 双磁铁不对称270°偏转磁铁系统布局

Figure 1. Layout of the dual asymmetric 270° deflection magnet system

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图 2 三块90°磁铁组成的270°偏转磁铁系统布局

Figure 2. Layout of the 270° deflection magnet system composed of three 90° magnets

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图 3 双磁铁不对称270°偏转系统漂移段和焦距随半径的变化

Figure 3. Variation of drift space and focal length with radius of dual asymmetric 270° deflection system

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图 4 双磁铁不对称270°偏转系统出口束斑尺寸随进出口极面角的变化

Figure 4. Variation of beam size at the exit of the dual asymmetric 270° deflection system with the entrance and exit polar face angles

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图 5 三块90°磁铁组成的270°偏转结构的消色散约束关系

Figure 5. Achromatic constraints of 270° deflection system composed of three 90° magnets

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图 6 双磁铁不对称270°偏转磁铁束流参数变化曲线

Figure 6. Variation curve of beam parameters in dual-magnet asymmetric 270° deflection system

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图 7 三块90°磁铁组成270°偏转磁铁的束流参数变化曲线

Figure 7. Variation curve of beam parameters in 270° deflection system composed of three 90° magnets

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图 8 三块非90°磁铁组成的270°偏转磁铁系统示意图

Figure 8. Layout of the 270° deflection magnet system composed of three non-90° magnets

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图 9 70°+130°+70°组成270°偏转磁铁的束流参数变化曲线

Figure 9. Variation curve of beam parameters in 270° deflection system composed of 70°+130°+70° magnets

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表 1 两种270°偏转系统的结构参数

Table 1. Structural parameters of two 270° deflection systems

description	magnet angle/(°)	radius/m	injection angle/(°)	exit angle/(°)	gap/m	drift/m	focus distance/m
two magnets	165.4，104.6	0.1−1	5.73，−59.6	59.6，−14.3	0.03	0.023−0.23	0.1−1
three magnets	90，90，90	S₂/1.4	10.2，10.2，10.2	10.2，10.2，10.2	0.07	0.2−1（S₂）	＞2

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表 2 两种270°偏转系统在不同弯转半径下出口1.5 m处发射度和束斑的变化

Table 2. Changes of emittance and beam spot size at 1.5 m exit point of two 270° deflection systems under different turning radius

R/m	two magnets		three magnets
R/m	drift/m	σ_x,σ_y/(mm, mm)	drift/m	σ_x,σ_y/(mm, mm)
0.2	0.046	33.8，32.5	0.28	8.72，8.07
0.3	0.069	23.3，21.7	0.42	8.53，8.05
0.4	0.092	18.1，16.3	0.56	8.41，8.04
0.5	0.115	14.3，12.4	0.7	8.31，8.03

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表 3 70°+130°+70°磁铁组成的270°偏转系统结构参数

Table 3. Structural parameters of 270° deflection system composed of 70°+130°+70° magnets

magnet angle/(°)	radius/m	injection angle/(°)	exit angle/(°)	gap/m	drift /m	focus distance/m
70，130，70	0.2	0，8，−4.3	−4.3，8，0	0.04	0.1924	2

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表 4 三种270°偏转系统结构参数及出口1.5 m处束流参数

Table 4. Structural parameters of three 270° deflection systems and beam parameters at 1.5 m

type	magnet angle/(°)	radius/ m	injection angle/(°)	exit angle/ (°)	gap/ m	drift / m	focus length/m	σ_x,σ_y/ (mm, mm)	vertical height/cm
two magnets	165.4，104.6	0.5	5.73，−59.6	59.6，−14.3	0.03	0.115	short	14.3，12.4	98.4
three magnets	90，90，90	0.2	10.2，10.2，10.2	10.2，10.2，10.2	0.07	0.28	long	8.72，8.07	68
70°+130°+70° magnets	70，130，70	0.2	0，8，−4.3	−4.3，8，0	0.04	0.1924	medium	3.6，4.75	58

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参考文献(19)

[1]	李金海. 射频电子辐照加速器原理与关键技术[M]. 上海: 上海交通大学出版社, 2020 Li Jinhai. Principles and key technologies of radio frequency accelerators for electron irradiation[M]. Shanghai: Shanghai Jiao Tong University Press, 2020
[2]	Cleland M R. Industrial applications of electron accelerators[R]. Zeegse, The Netherlands: CERN Accelerator School, 2006: 383-416.
[3]	Amano Y. Atoms in industry: radiation technology supports development[N/OL]. Vienna: IAEA Bulletin, 2015. https://www.iaea.org/publications/magazines/bulletin/56-3.
[4]	Hamm R W. Review of industrial accelerators and their applications[R]. AP/IA-12, 2009.
[5]	Shahzad A A, Patil B J, Pethe S N, et al. Design of electron beam bending magnet system for electron and photon therapy: a simulation approach[J]. Indian Journal of Pure & Applied Physics, 2019, 57(7): 492-497.
[6]	Akhter S, Bhoraskar V N, Dhole S D. 270° electron beam bending system using two sector magnets for therapy application[C]//Proceeding of IBIC 2012. 2012: 50-53.
[7]	杨绍洲, 杨光, 沈庆贤, 等. 医用电子直线加速器的射束偏转系统[J]. 中国医学物理学杂志, 2000, 17(3):129-131,133 doi: 10.3969/j.issn.1005-202X.2000.03.001 Yang Shaozhou, Yang Guang, Shen Qinxian, et al. The beam bend magnet system of medical electron accelerator[J]. Chinese Journal of medical Physics, 2000, 17(3): 129-131,133 doi: 10.3969/j.issn.1005-202X.2000.03.001
[8]	刘迺泉. 270°消色差偏转磁铁束流传输特性[J]. 核科学与工程, 1983, 3(1):79-89 Liu Naiquan. Beam transport characteristics of the 270° doubly achromatic bending magnet[J]. Chinese Journal of Nuclear Science and Engineering, 1983, 3(1): 79-89
[9]	陈万忠, 纪东泽, 成希革. 270°束流偏转系统研制[J]. 医学装备, 2009, 22(8):46-48 Chen Wanzhong, Ji Dongze, Cheng Xige. Development of 270° beam deflection system[J]. Medical Equipment, 2009, 22(8): 46-48
[10]	李泉凤, 孔巢城, 郭冰琪, 等. 束流在270°偏转磁铁系统输运过程中的损失计算[J]. 高能物理与核物理, 2007, 31(8):787-791 doi: 10.3321/j.issn:0254-3052.2007.08.018 Li Quanfeng, Kong Chaocheng, Guo Bingqi, et al. Calculation of the beam loss in the 270° bending magnet system of the medical accelerator[J]. High Energy Physics and Nuclear Physics, 2007, 31(8): 787-791 doi: 10.3321/j.issn:0254-3052.2007.08.018
[11]	Chemerisov S D, Gromov R, Bailey J L, et al. Beamline design and beam diagnostic for Mo-99 production facility utilizing high power electron accelerators[R]. Argonne: Argonne National Lab, 2019.
[12]	Shahzad A, Phatangare A B, Bharud V D, et al. Design and development of the 6-18 MeV electron beam system for medical and other applications[J]. Radiation Effects and Defects in Solids, 2017, 172(11/12): 931-951.
[13]	Brown K L, Turnbull W G. Achromatic magnetic beam deflection system: 3867635[P]. 1975-02-18.
[14]	Hutcheon R M, Heighway E A. A new compact doubly achromatic asymmetric two-magnet beam deflection system[J]. Nuclear Instruments and Methods in Physics Research, 1981, 187(1): 81-87. doi: 10.1016/0029-554X(81)90473-0
[15]	Jongen Y, Abs M, Zaremba S, et al. Realignment of a diverging electron beam: a new beam delivery system for Rhodotrons[C]//Proceedings of 1997 Particle Accelerator Conference. Vancouver: IEEE, 1997: 3857-3859.
[16]	李泉凤, 邹昀. 双消色散270°偏转磁铁的物理设计[J]. 原子能科学技术, 1995, 29(5):423-427 Li Quanfeng, Zhou Yun. Physical design of a 270° double achromatic bending magnet[J]. Atomic Energy Science and Technology, 1995, 29(5): 423-427
[17]	Michael B. User’s Manual for elegant[EB/OL]. Michael Borland: Advanced Photon Source, 2016. https://www3.aps.anl.gov/forums/elegant/.
[18]	M B, Makino K. COSY INFINITY 9.1 programmer’s manual[EB/OL]. East Lansing: Michigan State University, 2011. http://cosyinfinity.org.
[19]	魏开煜. 带电束流传输理论[M]. 北京: 科学出版社, 1986 Wei Kaiyu. Charged beam transport theory[M]. Beijing: Science Press, 1986