激光尾波加速器产生的明亮双脉冲贝塔tron X射线
Bright dual-pulse betatron X-ray generation from a laser wakefield accelerator
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中文总结 AI 辅助
该研究基于密度定制气体混合靶，通过电离诱导与激波前沿触发注入产生双电子束团，实验实现每发10^10光子的高通量双脉冲贝塔tron X射线源，为实验室超快X射线光谱学提供紧凑型方案。
中文摘要 AI 辅助
利用双超短X射线脉冲开展的泵浦-探测实验，为解析强X射线激发引发的非平衡动力学提供了独特机遇。激光尾波加速器产生的贝塔tron辐射具有飞秒级持续时间、微米级源尺寸，且与驱动激光固有同步，是紧凑型超快X射线源的理想候选。本文通过实验演示了一种基于密度定制气体混合靶的高通量双脉冲贝塔tron X射线源：在单个等离子体尾波中，通过电离诱导注入和激波前沿触发注入产生两个电子束团，进而生成双X射线脉冲。结合测得的电子能谱、双分量X射线角分布及粒子模拟，明确了两种电子组分对辐射的贡献；在40-TW激光系统下，总X射线光子产额达到每发10^10个光子的水平。这些结果为实验室规模的超快X射线光谱学构建了一条紧凑型单级高通量双脉冲贝塔tron源的实现路径。
英文摘要
Pump-probe experiments using dual ultrashort X-ray pulses provide unique opportunities for resolving non-equilibrium dynamics initiated by intense X-ray excitation. Betatron radiation from laser wakefield accelerators offers femtosecond duration, micrometer-scale source size, and intrinsic synchronization with the driving laser, making it a promising candidate for compact ultrafast X-ray sources. Here, we experimentally demonstrate a high-flux, dual-pulse betatron X-ray source based on a density-tailored gas-mixture target. Two electron bunches are generated within a single plasma wakefield through ionization-induced and shock-front-triggered injection, subsequently producing twin X-ray pulses. The measured electron spectra and dual-component X-ray angular profiles, together with particle-in-cell simulations, identify the contributions of the two electron populations to the radiation. The total X-ray photon yield reaches the level of 10^{10} photons per shot with a 40-TW laser system. These results establish a compact, single-stage route toward high-flux dual-pulse betatron sources for laboratory-scale ultrafast X-ray spectroscopy.
