一种新型硬X射线超高能量分辨弯晶光谱仪  

Hard X-Ray Bent Crystal Spectrometer with High Energy Resolution

作　　者：杨志诚 李宾[1,2,3,4] Yang Zhicheng;Li Bin(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China;School of Physical Science and Technology,Shanghai Tech University,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院上海高等研究院上海同步辐射光源,上海201204 [3]上海科技大学物质科学与技术学院,上海201210 [4]中国科学院大学,北京100049

出　　处：《光学学报》2022年第11期225-233,共9页Acta Optica Sinica

基　　金：国家自然科学基金(11975299);国家973项目(2016YFA0401901)。

摘　　要：基于目前世界上先进光源的硬X射线光谱仪的设计算法,采用圆柱面强弯曲布拉格晶体分光实现高能量分辨。提出了一种新型二次衍射分光光谱仪结构,可在3~25 keV光子能量范围内实现单发脉冲2×10^(5)的能量分辨率。运用理论分析和数值计算验证了光谱仪的能量分辨性能,并通过机械扫描得到带宽大于1%的重组光谱。该技术可以用于测量上海硬X射线自由电子激光装置(SHINE)硬X射线波段自放大自发辐射光谱中的细锐结构以及用户科学实验中的高分辨光谱的探测和应用,具有重要的研究价值和意义。Based on design algorithms of hard X-ray spectrometers in advanced light sources around the world, high energy resolution is realized by adopting cylindrically bent Bragg crystals. A new structure of a double diffraction spectrometer is proposed, which can achieve 2×10^(5) energy resolution of single pulse in the photon energy range of 3--25 keV. The energy resolution performance of the spectrometer is verified by theoretical analysis and numerical calculation. And a broad spectrum with bandwidth beyond 1% can be reconstructed via mechanical scan. This technique can potentially be used to measure the fine structure in self-amplified spontaneous emission(SASE) spectra within hard X-ray spectral range for Shanghai High Repetition Rate hard X-ray free electron laser(XFEL) and Extreme Light Facility(SHINE), and it can be applied to detection and application of the cutting edge user scientific researches demanding high resolving power, preserving important merit of value in science and technology.

关 键 词：X射线光学 光谱仪 圆柱面强弯曲晶体 硬X射线自由电子激光 单发在线测量 

分 类 号：O434.12[机械工程—光学工程]