Bunching enhancement for coherent harmonic generation by using phase merging effects

IF 4.8 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Ke Feng, Kangnan Jiang, Runshu Hu, Shixia Luan, Wentao Wang, Ruxin Li
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Abstract

In this paper, promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation (CHG) by using phase merging effects. In contrast to the standard CHG scheme, two specially designed dispersion sections (DSs) are adopted with the DS-modulator–DS configuration. The phase space of the e beam is appropriately coupled in the first DS, and the electrons within one seed wavelength can merge to the same phase with a matched second DS. Micro-bunching of the e beam can thus be enhanced by a large margin with much higher-harmonic components. Taking e beams from laser wakefield accelerators (LWFAs) as an example, start-to-end simulations are performed to show the effectiveness and robustness of the proposed schemes with several configurations. The beam current can be optimized to several tens to hundreds of kiloamperes, and the radiation power reaches hundreds of megawatts in the extreme ultraviolet regime within a 3.5 m-long beamline. The proposed schemes offer new opportunities for future compact free-electron lasers driven by LWFAs and provides prospects for truly compact and widely applicable systems.
利用相位合并效应增强相干谐波生成的捆绑功能
本文研究了利用相位合并效应增强相干谐波发生(CHG)用相对论电子束微束化的前景广阔而又简单的方案。与标准的相干谐波发生(CHG)方案不同的是,本文采用了两个特殊设计的色散段(DS)和 DS 调制器-DS 配置。电子束的相位空间在第一个色散段中适当耦合,一个种子波长内的电子可通过匹配的第二个色散段合并到相同的相位。因此,电子束的微束化可以通过更高的谐波成分得到大幅增强。以激光汪场加速器(LWFAs)的电子束为例,我们进行了从头到尾的模拟,以显示所建议的几种配置方案的有效性和稳健性。在 3.5 米长的光束线内,光束电流可优化到几十到几百千安培,在极紫外波段的辐射功率可达几百兆瓦。所提出的方案为 LWFA 驱动的未来紧凑型自由电子激光器提供了新的机遇,并为真正的紧凑型和广泛应用系统提供了前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Matter and Radiation at Extremes
Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
8.60
自引率
9.80%
发文量
160
审稿时长
15 weeks
期刊介绍: Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.
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