光学学报, 2019, 39 (8): 0822001, 网络出版: 2019-08-07   

一种新型keV波段超高分辨光栅光谱仪设计 下载: 1016次

Design of Novel KeV-Range Grating Spectrometer with Ultra-High Resolving Power
李卓 1,2,3李宾 1,2,3,4,*
作者单位
1 中国科学院上海应用物理研究所, 上海 201800
2 中国科学院大学, 北京 100049
3 中国科学院上海高等研究院上海同步辐射光源自由电子激光技术部, 上海 201204
4 上海科技大学物质科学与技术学院, 上海 201210
摘要
国家自然科学基金(11475249)、国家“计划”青年项目基金(Y326021061);
Abstract
This paper presents a novel grating spectrometer design that combines a convexly cylindrical mirror with a concavely cylindrical varied line spacing grating to achieve an extreme resolving power of 33000-70000 in the photon energy range of 0.6-1.5 keV for a Gaussian light source with effective meridional size of 30 μm (root mean square) at an upstream initial object distance of 10 m. This type of spectrometer can be used to diagnose the radiation spectrum of a soft X-ray free electron laser and properly measure the spectral distribution and the detailed structure of the self-amplified spontaneous emission mode due to its extremely high resolving power. The overall optical aberrations of the system are well analyzed and compensated, providing an excellent flat field at the detector domain throughout the entire spectral range. A machine learning support vector machine algorithm is introduced into explore the optimal system to deliver the desired resolving performance. In addition, to enhance the spectral intensity and detection efficiency simultaneously, a sagittal confinement focusing mirror is introduced into the optical path of the spectrometer to reduce the astigmatism in spectral imaging.

李卓, 李宾. 一种新型keV波段超高分辨光栅光谱仪设计[J]. 光学学报, 2019, 39(8): 0822001. Zhuo Li, Bin Li. Design of Novel KeV-Range Grating Spectrometer with Ultra-High Resolving Power[J]. Acta Optica Sinica, 2019, 39(8): 0822001.

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