偏置磁极周期会切永磁场的理论分析

杜广星; 钱宝良

doi:10.7498/aps.59.1726

摘要

采用不同的近似方法对用于聚焦带状电子束传输的偏置磁极周期会切永磁场进行了理论分析，得到了两种不同形式的解析表达式，分别适用于数值计算和理论分析．首先，为了对偏置磁极周期会切永磁铁进行快速而又精确地数值仿真，利用表面电流带模型对其进行等效，得到了其激励的偏置磁极周期会切永磁场的解析表达式，并借助算例说明了表面电流带模型应用于等效偏置磁极周期会切永磁铁开展优化设计的高效性．然后，为了便于在将来开展对带状电子束传输的理论分析，按传统方法将偏置磁极周期会切永磁场分为两部分，一部分是磁极的无偏置部分激励的周期会切磁

关键词:

Abstract

The magnetic field excited by the offset-pole periodic cusped permanent magnet （OPPCPM） used for focusing the sheet electron beam has been approximately expressed in two different forms for the convenience of future numerical calculation and theoretical analysis, respectively. Firstly, the surface-current-sheet model has been used to approximate the OPPCPM, and an accurate expression has been obtained using Biot-Savart law. This expression would rather be applied to numerical calculation than theoretical analysis because of the complication. The optimization of entrance taper of the OPPCPM has been performed as an example of application of the expression, implying the high efficiency of the calculation brought by the expression. Secondly, to obtain simple expression of the magnetic field for the convenience of future theoretical analysis, the OPPCPM field has been divided into two parts: the periodic cusped magnetic （PCM） field component and the side-focusing magnetic field component. The expressions of the PCM field component have been obtained using the method of undetermined coefficient, while the expressions of the other one have been obtained using two-magnetic-charge-sheet model. The results are useful to study the transportation of the sheet electron beam in the offset-pole PCM field.

Keywords:

作者及机构信息

1.
国防科学技术大学光电科学与工程学院,长沙 410073

基金项目: 国家高技术研究发展计划（863）资助的课题.

Authors and contacts

1.
国防科学技术大学光电科学与工程学院,长沙 410073

参考文献

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施引文献

[1]	［1］Read M E, Jabotinski V, Miram G, Ives L 2005 IEEE Trans. Plasma Sci. 33 647
[2]	［2］Cheng S, Destler W W, Granatstein V L, Antonsen T M, Jr., Levush B, Rodgers J, Zhang Z X 1996 IEEE Trans. Plasma Sci. 24 750
[3]	［3］Carlsten B E 2005 Nucl. Instrum. Meth. A 550 14
[4]	［4］Zhou J, Chen C 2006 Phys. Rev. ST -Accel. Beams 9 104201
[5]	［5］Burke A, Besong V, Graniund K, Jensen A J, Jongewaard E, Phillips R, Rauenbuehler K, Scheitrum G, Steele R 2006 IEEE IVEC 485
[6]	［6］Humphries S, Russell S, Carlsten B E, Earley L 2005 IEEE Trans. Plasma Sci. 33 882
[7]	［7］Yang J H, Wang Y, Wang S Z 2007 High Power Laser and Particle Beams 19 643
[8]	［8］Basten M A, Booske J H 1999 J. Appl. Phys. 85 6313
[9]	［9］Booske J H, McVey B D, Antonsen T M Jr. 1993 J. Appl. Phys. 73 4140
[10]	］Kyhl R L, Webster H F 1956 IRE Trans. Electron Devices ED-3 1720
[11]	］Webster H F 1955 J. Appl. Phys. 26 1386
[12]	］Davidson R C, Tsang K T, Uhm H S 1988 Phys. Fluids 31 1727
[13]	］Uhm H S, Shahar Ben-Menahem, Yu D 1994 Phys. Plasmas 1 3686
[14]	］Cheng S, Destler W W 1995 Nucl. Instrum. Meth. A 358 200
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[16]	］Tatchyn R 1996 Nucl. Instr. and Meth. A 375 500
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[20]	］Destler W W, Granatstein V L, Mayergoyz I D, Segalov Z 1986 J. Appl. Phys. 60 521
[21]	］Varfolomeev A A, Bouzouloukov Yu P, Gubankov V V, Ivanchenkov S N, Khlebnikov A S, Osmanov N S, Tolmachev S V 1995 Nucl. Instrum. Meth. A 359 85

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