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Space charge induced beam instability in periodic focusing channel
Li C(李超); Qin Q(秦庆); Li, C; Qin, Q
2015
发表期刊PHYSICS OF PLASMAS
卷号22期号:2页码:23108
通讯作者李超
文章类型Article
摘要The transverse evolution of the envelope of an intense, unbunched ion beam in a linear periodic transport channel can be modeled for the approximation of linear self-fields by the Kapchinskij-Vladimirskij envelope equation. The envelope mismatched modes, or the second order even mode [I. Hofmann, Phys. Rew. E 57, 4713 (1998)], are the lowest order of resonance leading to collective instability that the designer should avoid, which suggests that an accelerator system should be established in the parameter region where the zero beam current phase advance sigma(0) less than 90 degrees. In this paper, we systemically studied the resonance mechanisms which result in confluent resonance in quadrupole Focusing-Defocusing (FD) channel and parametric resonance in solenoid channel. We propose that the mismatch modes cannot be exactly separated in FD channel; if one mode is excited, there is always some contribution of the other. To verify the influence of the confluent resonance and parametric resonance, the 2D Poissons solver in the self-consistent particle-in-cell simulation code TOPOPIC is adopted to study the beam evolution in both channels. Our simulations results show that the emittance show significant growth both in the confluent resonance stop band and parametric resonance stop band. The influences of the higher order of resonance are also discussed. (C) 2015 AIP Publishing LLC.
学科领域Physics
DOI10.1063/1.4908546
收录类别SCI ; EI ; CA
WOS类目Physics, Fluids & Plasmas
WOS记录号WOS:000350552000102
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228272
专题加速器中心
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Li C,Qin Q,Li, C,et al. Space charge induced beam instability in periodic focusing channel[J]. PHYSICS OF PLASMAS,2015,22(2):23108.
APA 李超,秦庆,Li, C,&Qin, Q.(2015).Space charge induced beam instability in periodic focusing channel.PHYSICS OF PLASMAS,22(2),23108.
MLA 李超,et al."Space charge induced beam instability in periodic focusing channel".PHYSICS OF PLASMAS 22.2(2015):23108.
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