【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。更多还原

【Abstract】 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 measurements,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 flat 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.更多还原