带状电子注空间电荷场的格林函数法求解  

Green’s Function Simulation Of Space-Charge Effects in Sheet Electron Beams

作　　者：张小锋[1,2] 阮存军[1] 韩莹[1,2] 罗积润[1] 赵鼎[1] 阮望[1] 

机构地区：[1]中国科学院电子学研究所,中国科学院高功率微波源与技术重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《微波学报》2010年第S1期467-470,共4页Journal of Microwaves

基　　金：国家自然科学基金(60501019;60971073;10775139)

摘　　要：带状电子注具有非轴对称性和大宽高比的特性,为了研究其空间电荷效应,本文建立了相应的二维宏粒子物理模型,并通过格林函数法求解带状电子注内的空间电荷力。在该模型中,带状电子注用一系列窄带代替,每个窄带受到的空间电荷力通过叠加其它窄带作用于该窄带的电场力得到。本文对该窄带模型进行了详细的分析,计算了电子注内的空间电荷力,编写了基于该模型的数值模拟程序,模拟了带状电子注在不同静电磁约束下的运动及传输情况,计算结果与三维PIC软件有很好的一致性,验证了基于该二维宏粒子模型的格林函数法求解带状电子注空间电荷场的合理性和准确性。The sheet beam with a large width-high ratio is nonaxisymmetrical.In this paper,a 2D macroparticle physical model for space-charge forces in sheet electron beams based on a Green’s function approach is described.In this model,the beam is simulated by a series of rods with nonzero thickness and length.The space-charge force on a rod is found by summing over all the interactions with all the other rods.The rod model is described detailedly,a numerical program based on this model is developed.The transmission of the sheet beam in different electromagnetostatic fields had been simulated using this numerical program,and the calculation results was in good agreement with 3D PIC software’s,which showed that the space-charge fields calculated by Green’s function approach is accurate and reasonable.

关 键 词：带状电子注 空间电荷场 窄带宏粒子 

分 类 号：O441.1[理学—电磁学]