高效角分辨X射线光谱仪，优化用于准直源吸收测量
Highly efficient angularly resolving x-ray spectrometer optimized for absorption measurements with collimated sources
摘要：
来自激光尾场加速器的高准直电子感应加速器辐射是一种很有前途的光谱测量工具。因此，需要创建适合于这种源的独特性质的光谱仪。我们展示了一个光谱仪，它实现了在9 keV的能量分辨率< 5 eV，是角度分辨的X射线发射允许参考和光谱被记录在同一时间。单光子分析用于显著降低背景噪声。光谱仪的各种配置的理论性能计算的光线跟踪算法。实验证明，光谱仪的性能和性能，包括角和光谱分辨率的吸收以上的K-边的Cu箔背照由激光产生的电子感应加速器辐射X射线束。
英文摘要：
Highly collimated betatron radiation from a laser wakefield accelerator is a promising tool for spectroscopic measurements. Therefore there is a requirement to create spectrometers suited to the unique properties of such a source. We demonstrate a spectrometer which achieves an energy resolution of < 5 eV at 9 keV and is angularly resolving the x-ray emission allowing the reference and spectrum to be recorded at the same time. The single photon analysis is used to significantly reduce the background noise. Theoretical performance of various configurations of the spectrometer is calculated by a ray-tracing algorithm. The properties and performance of the spectrometer including the angular and spectral resolution are demonstrated experimentally on absorption above the K-edge of a Cu foil backlit by laser-produced betatron radiation x-ray beam.
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