激光等离子体球面晶体光谱成像
Spherically bent crystal spectroscopy in laser-produced plasma
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摘要: 利用自聚焦原理，研制了一种新型的球面弯晶谱仪。晶体分析器采用云母材料，其弯曲半径为380 mm，布拉格角为51°。利用成像板接收光谱信号，其有效面积为30 mm×80 mm，从等离子体源经晶体到成像板的光程长为980 mm。物理实验在中国工程物理研究院激光聚变研究中心20 J激光装置上进行，入射激光能量为6.78 J，成像板获得了铝激光等离子体X射线的光谱空间分辨信号。球面云母弯晶谱仪的光谱分辨率达到1 000～1 500，在相同环境放置的PET平晶的光谱分辨率为50～100。结果表明：球面弯晶具有较高的光谱分辨率和信噪比，适合于激光等离子体X射线的光谱学研究。Abstract: A curved crystal X-ray spectrographs of reflection type spherical geometry was required based on the Johann scheme. Due to their high efficiency and resolution, X-ray spectrographs of focusing spectrograph spatial resolution are suitable for detecting weak X-ray spectra in spectrometers for laser fusion research. Spherically bent mica crystal with a radius of curvature of 380 mm was used in the spectrometer. The Bragg angle of the crystal analyzer was 51°.The image plate was employed to obtain high spatial resolution and a narrow spectral band width, with an effective area of 30 mm×80 mm. The designed optical path of the X-ray spectrometer beam was 980 mm long from the source to the crystal and the detector. The first experiment was carried out at the 20 J energy laser facility of Resear
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