基于截断电离注入机制的激光汪场加速电子束质量参数分析

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Plasma Physics and Controlled Fusion Pub Date : 2024-02-07 DOI:10.1088/1361-6587/ad238e
Srimanta Maity, Alamgir Mondal, Eugene Vishnyakov, Alexander Molodozhentsev
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引用次数: 0

摘要

为了产生高质量的电子束,研究人员对气体室靶中分离注入和加速部分的激光汪场加速(LWFA)进行了研究。研究人员结合截断电离和密度下降注入机制,对控制加速电子束的质量进行了详细研究。为此,我们进行了大量的二维粒子池模拟,考虑到气室靶的第一部分是氢氮混合物,第二部分是纯氢。这种配置可以通过专门设计的毛细管装置在实验中实现。利用现有实验装置中已有的参数,我们展示了峰值能量为 500-600 MeV、相对能量扩散小于 5%、归一化电子束发射率约为 1.5 mm-mrad、电子束电荷为 2-5 pC/µm的电子束的产生过程。我们的研究表明,加速电子束的质量可以通过调整激光聚焦位置、氮气浓度和气体靶轮廓等参数,在束流加载效应的作用下进行独立控制和操纵。这些模拟结果将对未来的 LWFA 实验活动,尤其是 ELI 光束线的实验活动非常有用。
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Parametric analysis of electron beam quality in laser wakefield acceleration based on the truncated ionization injection mechanism
Laser wakefield acceleration (LWFA) in a gas cell target separating injection and acceleration section has been investigated to produce high-quality electron beams. A detailed study has been performed on controlling the quality of accelerated electron beams using a combination of truncated ionization and density downramp injection mechanisms. For this purpose, extensive two-dimensional particle-in-cell simulations have been carried out considering a gas cell target consisting of a hydrogen and nitrogen mixture in the first part and pure hydrogen in the second part. Such a configuration can be realized experimentally using a specially designed capillary setup. Using the parameters already available in the existing experimental setups, we show the generation of an electron beam with a peak energy of 500–600 MeV, relative energy spread less than 5% , normalized beam emittance around 1.5 mm-mrad, and beam charge of 2–5 pC/µm. Our study reveals that the quality of the accelerated electron beam can be independently controlled and manipulated through the beam loading effect by tuning the parameters, e.g. laser focusing position, nitrogen concentration, and gas target profile. These simulation results will be useful for future experimental campaigns on LWFA, particularly at ELI Beamlines.
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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