激光等离子体X射线椭圆弯晶谱仪的设计

Elliptical Crystal Spectrometer Designed for Laser-Produced Plasma X-Ray

为了诊断0.2～2 nm的激光等离子体X射线,研制了一种新型的基于时间分辨和空间分辨的聚焦型椭圆弯晶谱仪,采用两个完全相同且对称分布的通道可以同时获得谱线的空间和时间分辨率.给出了弯晶谱仪的设计参数,采用了新颖的瞄准对中技术,并对光源偏离椭圆轴线造成的误差进行了分析.在'神光Ⅱ'靶室上进行打靶实验对该谱仪进行标定,利用X射线CCD相机成功地获取了谱线的图像,实验结果表明实测谱线波长与理论值吻合.

A new space and time resolved focusing elliptical curved crystal spectrometer has been developed and applied to diagnose X-ray of laser-produced plasma in 0.2-2 nm region. Twin channels collocated symmetrically are utilized for simultaneous measurement of space and time resolved spectra. The design parameters of the spectrometer are presented, a novel aligning method is adopted, and the error due to off-axis of source is analyzed. The spectrometer has been calibrated for experiment on Shengguang-II target chamber in Shanghai. Photographs of spectra have been recorded by using X-ray CCD camera. It is demonstrated experimentally that the measured wavelength is accorded with the theoretical value.