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高亮度meV分辨率单射硬X射线光谱仪用于基于空洞的X射线自由电子激光器

Keshab Kauchha¹, Peifan Liu¹, Paresh Pradhan¹

¹Argonne National Laboratory, Lemont, IL 60439, USA.

Journal of synchrotron radiation

|June 12, 2025

概括

开发了一种新的硬X射线光谱仪,用于测量高分辨率的基于空腔的X射线自由电子激光器 (CBXFEL) 的光谱. 诊断工具实现了meV光谱分辨率和高亮度,用于射击对射击分析.

科学领域:

物理物理学物理
材料科学材料科学材料科学
光学是什么?光学是什么?光学是什么?

背景情况:

基于空洞的X射线自由电子激光器 (CBXFEL) 提供了高度连贯的硬X射线生成的潜力.
CBXFELs需要精确的诊断,因为它们的频谱带宽窄 (∼1-50 meV) 和高亮度.
现有的方法缺乏必要的meV分辨率和高亮度来进行射击对射击CBXFEL光谱分析.

研究的目的:

为CBXFELs设计和测试一个高亮度,单射硬X射线光谱仪.
为了实现meV光谱分辨率和高亮度,用于精确的光谱测量.
在运行条件下评估光谱仪的性能.

主要方法:

光谱仪利用来自晶体的布拉格衍射来进行X射线的角分散.
它的设计是为了在约200 meV的光谱窗口内对9.831 keV的X射线进行成像.
实验是在先进光子源 (APS) 束线1-BM进行的.

主要成果:

光谱仪显示了≤1.4μm meV-1.1的线性分散率.
实现了≤200 meV的高准确度光谱成像窗口.
在实验中,获得了≤20 meV的光谱分辨率,由于晶体的角度不稳定性,略低于理论预测.

结论:

开发的硬X射线光谱仪是CBXFELs的可行的诊断工具.
该仪器提供高亮度和光谱分辨率,适用于射击对射击分析.
需要进一步优化以减轻晶体的角度不稳定性并实现理论光谱分辨率.

关键词:

布拉格衍射法是什么?这是X射线.角分散的角度分散.基于空洞的XFELs.一个光谱仪 (spectrograph) 的作用.

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