非线性共振及束晕-混沌的场强参数特性  

Field strength characteristics of nonlinear resonances and halo-chaos

作　　者：段如 郝建红[1] 许海波[2] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2014年第1期211-215,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61250008);科技部国际科技合作项目(2011DFR00780)

摘　　要：通过计算和分析周期聚焦磁场强度和表征束自生场强度的束导流系数的变化对强流粒子束运动特征的影响,系统研究了强流粒子束的非线性共振和束晕现象。采用庞加莱截面技术对束核包络振荡及其单粒子运动轨迹进行了数值模拟,清楚地展示了不同情况下束核包络非线性振荡以及对应的试验粒子空间分布。结果表明:束核自生场使得束核包络发生非线性振荡,随着束核自生场和聚焦磁场的增加,伴随着束核共振岛的出现,单粒子空间分布出现越来越多的束晕粒子。Nonlinear resonances and halo-chaos behavior of an intense charged-particle beam are discussed.The influences of the focusing field strength and the beam perveance about the intense charged-particle beam are analyzed.The beam envelope oscillations and the orbits of the single-particle are simulated by using Poincaré mapping technique.The simulation result clearly illustrates the nonlinear oscillations of the beam envelope and the spatial distribution of the corresponding test particle under different conditions.It shows that the beam self-field leads to the nonlinear oscillations of the beam envelope.With the increase of beam self-field and focusing field,a growing number of diffuse particles appear in the particle spatial distribution along with the emergence of the resonance island.

关 键 词：束晕-混沌 周期聚焦通道 非线性共振 束包络 

分 类 号：TL501[核科学技术—核技术及应用]