椭球面晶体软X光单能成像技术研究

Based on ellipsoidal bent crystal X-ray imaging method is used for the determination of the spectral and spatial distribution of X-ray intensity of laser-producedplasmas.In the elliptical geometry,an object is placed at the first focal point.The imaging will refocus at the second focal point.An ellipsoid is an ideal surface to get a stigmatic image of a point source.The use of Bragg reflections of two-dimensionally bent crystal enables the X-ray imaging in a limited spectral range with wavelengths 0.3nm-0.6nm.It makes the plasma imaging by observing the transformation of target with measuring the light-emitting from target.Imaging diagnostics are powerful tools for studying the dense laser-produced plasmas and implosion process and instability.It can provide size,shape and distribution of fusion materials,resolve the diagnosis problem of the fuel-driven interface for the target,and provide an improtant evidence for the fusion ignition.The ellipsoidal bent crystal has many advantages:the crystal analyzer can be away from the target to protect measured signal from the debris sputtering as well as bremsstrahlung radiation background;Ellipsoidal bent crystal is,in principle,capable of high intensity,minimizes optical aberrations.Ellipsoidal bent crystal imaging is a conventional research technology,which has good radiation function and can be used in astrophysics,medicine,imaging and diagnostics for biochemistry molecule.

椭球面晶体软X光单能成像方法可以用来诊断激光等离子体X射线的光谱和空间分布信息，根据椭圆几何原理，置于椭圆第一焦点的物体，经过椭圆反射会聚成像在第二焦点。而椭球面成像是一理想消像差系统。利用布拉格反射二维弯曲晶体可在一个指定0.3-0.6nm的能谱范围内成像。通过测量靶球自发光或背光来观测靶球变形与等离子体成像，其图像诊断是研究高功率激光等离子体和聚爆过程与不稳定性的主要手段。该成像能显示出聚变材料尺寸、形状和分布情况，从原理上解决辐射驱动靶球燃料界面诊断难题，为聚变点火提供重要验证依据。椭球面晶体析器优点是：可远离靶点，避免碎片溅射以及轫致辐射背景对被测信号覆盖影响；光学聚焦可提高信号强度，理论上它可以减小光学像差到最小。X射线椭圆晶体成像是一种有共性研究价值的基础技术，也可用于天体物理、医学、生物化学分子成像及诊断等方面的研究，具有较好的技术辐射。

椭球面晶体软X光单能成像方法可以用来诊断激光等离子体x射线的光谱和空间分布信息，根据椭圆几何原理，置于椭圆第一焦点的物体，经过椭圆反射会聚成像在第二焦点。而椭球面成像是一理想消像差系统。利用布拉格反射二维弯曲晶体可在一个指定0.3-0.6nm的能谱范围内成像。通过测量靶球自发光来观测靶球变形与等离子体成像。椭球面晶体分析器其优点是：可远离靶点，避免碎片溅射以及轫致辐射背景对被测信号覆盖影响；光学聚焦可提高信号强度，理论上它可以减小光学像差到最小。.我们首次开发了椭球成像系统，具有毫米量级的视场，较低的几何像差。对牛津仪器公司5000系列 X射线管的110um焦点尺寸进行直接测量。其空间分辨率和光谱分辨率分别为8μm和1000。