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作 者:施军[1] 肖沙里[1] 雷小明[1] 徐东镪[1] 张世欣[1]
机构地区:[1]重庆大学光电技术及系统教育部重点实验室,重庆400030
出 处:《仪器仪表学报》2008年第5期982-985,共4页Chinese Journal of Scientific Instrument
基 金:国家自然科学基金(NSAF基金)项目(10576041)资助
摘 要:针对激光惯性约束核聚变辐射的X射线分析,可得到关于等离子体电子密度、温度、电荷分布等重要信息。研究的X射线弯晶谱仪分析器是用来诊断X射线光谱,进而实现对激光惯性约束核聚变的控制。探讨了椭圆弯晶谱仪理论原理,分析了积分反射率和质量吸收系数。弯晶谱仪采用LiF弯晶分析器,椭圆焦距2c为1350mm,椭圆离心率e为0.9586,晶体布拉格角范围为30°至60°。在此对LiF弯晶分析器的制作工艺进行详细描述。实验结果表明,该晶体分析器对X射线的分辨率(λ/Δλ)可达900以上,能够用来对激光等离子体的X射线光谱进行诊断。Inertial confinement fusion (ICF) radiates a lot of X-rays, which contain significant information, such as electron temperature, density, ionization and etc. X-ray spectrograph is used as a means of diagnosing the status of laser-produced plasmas for controlling ICF. The paper studies the theories of elliptical crystal analyzer of spectrograph, analyses the integrated reflectivity and absorption coefficient. The key component of the X-ray crystal spectrometer is an elliptical curved crystal analyzer. The spectrograph has a focal length of 1 350 mm and for these ts, LiF crystal bent onto an elliptical substrate with eccentricity e = 0.958 6 is utilized, The crystal analyzer covers the Bragg angel range from 30° to 60°. The analyzer is based on elliptically geometrical principle, which has self-focusing characteristics. In the experiment, the curved crystal spectrograph-recorded X-ray spectrum is at 90° to the laser axis and 45° to the target normal direction. The experiment suggests that the sensitivity of the focusing crystal analyzer is greatly improved over a fiat crystal. The calculated wavelength resolution is above 900 in the range of 0.2 - 0.35 nm. So the curved analyzer is suitable for diagnosing soft X-ray spectroscopy.
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