用于X射线时空分辨测量的弯晶谱仪

为了测量激光聚变产生的0.2～0.37 nm范围内的等离子体X射线, 设计了一种基于空间和时间分辨的聚焦型弯晶谱仪. 将在700℃时弯曲后的LiF(2d＝0.403 nm)晶体作为色散元件, 布喇格衍射角的变化范围为30～67.5°, 弯晶粘贴在离心率和焦距分别为0.9586和1350 mm的椭圆形不锈钢基底上. 利用弯晶谱仪配X光CCD相机在星光Ⅱ激光(0.35 μm, 60～80J, 700 ps)装置上摄取了钛平面靶发射的X射线光谱, 实验结果表明它的光谱分辨率能达到0.001 nm.

Bent Crystal Spectrometer for X-ray Space and Time Resolved Measurements

In order to measure plasma X-ray produced by laser fusion in the 0.2~0.37 nm range, a focusing bent crystal spectrometer has been designed for measuring the spatial and temporal resolutions. The LiF crystal with a 2d spacing of 0.403 nm was elliptically bent at 700℃ for the dispersive element, the Bragg diffractive angles vary from 30 to 67.5 degrees, the bent LiF crystal was fixed on the elliptical stainless-steel substrate with an eccentricity of 0.9586 and a focal distance of 1350 mm. The X-ray spectrum emitted from the planar titanium target was photographed by using the bent crystal spectrometer coupled with the X-ray CCD camera at the XG-2 laser facility, the experimental result shows that the spectral resolution is up to 0.001 nm.