摘要
空间电荷效应是制约强流离子束稳定传输的主要因素,主动馈入补偿气体被认为是一种能够抑制空间电荷效应的有效手段。但在强流负氢离子加速器中,负氢离子与补偿气体的作用机制十分复杂,存在多种互相竞争的物理过程。本研究通过数值模拟与实验测量,探究了负氢粒子与补偿气体在低能束流传输线中的相互作用机制。通过基于PIC方法的仿真程序,构建了包含电离反应、电子剥离反应和弹性碰撞散射等物理过程的三维仿真模型,研究了补偿气体为氮气和氩气时空间电荷补偿效应随气压、气体种类的变化对束流参数的影响规律。研究结果表明,对负氢束流进行空间电荷补偿研究时,补偿气体对束流的散射与剥离效应不可忽略。
[Background]Space charge effects pose a significant challenge in high-current ion beam transport,particularly in low-energy beam transport(LEBT)systems where beam intensity is high and energy is relatively low.Active injection of gas has been proposed as an effective method to mitigate these effects.However,for negativehydrogen ion beams,the physical mechanisms involved are highly complex due to competing processes such asionization,electron stripping,etc.[Purpose]This study aims to investigate the interaction mechanisms betweennegative hydrogen ion beams and gas within an LEBT system,and to evaluate the influence of gas species andpressure on beam parameters including emittance and beam current.[Methods]Numerical simulations based on theparticle-in-cell(PIC)method were conducted using the Warp code,incorporating physical processes includingionization,electron stripping,and elastic scattering.A three-dimensional simulation model was established to analyzespace charge compensation effects under nitrogen and argon gas environments.Experimental measurements of beamcurrent and emittance were simultaneously carried out at the XiPAF accelerator facility to validate simulation results.[Results]Both simulations and experiments revealed that the effects of gas scattering and electron stripping cannot beneglected in space charge compensation of negative hydrogen ion beams.[Conclusions]This research highlights thecomplexity of space charge compensation in negative hydrogen ion beams and emphasizes the need to considermultiple physical interactions in the design and operation of high-current LEBT systems.The findings providepractical insights for optimizing gas compensation parameters in similar accelerator facilities.
作者
朱睿
刘彤
王百川
闫逸花
王敏文
杨业
赵铭彤
叶文博
拓明泽
王忠明
Zhu Rui;Liu Tong;Wang Baichuan;Yan Yihua;Wang Minwen;Yang Ye;Zhao Mingtong;Ye Wenbo;Ta Mingze;Wang Zhongming(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)
出处
《强激光与粒子束》
北大核心
2025年第10期25-31,共7页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(12575158)。
关键词
低能束流传输线
XiPAF
空间电荷补偿
弹性散射
low-energy beam transport line
XiPAF
space charge compensation
elastic scattering
