Study of X-ray waveguide and functional device

1.用边界元方法分析了X射线光波导和功能器件的圆柱模型X射线束在平行多原子界面上的散射和反射特性。原子边界表面被认为是多层理想导电柱阵列。给出了散射场随入射角和X射线波长的变化关系。结果表明：1.衍射方向与波长有关。原子散射为了考虑原子中的电子云，从理论上研究了原子结构在X射线波长区的非均匀折射率分布。分析了具有非均匀折射率的介质柱模型的X射线散射特性。这种分析在原子区使用有限元方法，在其他区域使用边界元方法。对碳原子中的电场分布进行了估算。X射线在多层膜上的反射特性分析研究了低损耗X射线波导中多层膜的软X射线反射和传输特性。研究了Rh/Si多层反射镜的反射率与入射角、波长和层数的关系。结果表明，当入射角为80.4°时，在200A波长下可实现60%的反射率。X射线聚焦装置研究了一种使用渐变折射率介质的X射线聚焦装置。用光线追踪法对聚焦特性进行了分析。实验结果表明，该装置可以实现X射线的会聚。用光束传播法研究了器件的电场分布。

1. Characteristics of X-ray beam using cylindrical modelScattering and reflection characteristics of X-ray beams at pararell muti atom interface was analyzed by using boundary element method for X-ray waveguides and functional devices. Atomic boundary surface was considered as multilayr array of perfectly conducting cylinders. The dependence of the scattering fields on incident angle and wavelength of X-ray beam is estimated. It was found that the diffraction direction is the wavelength dependence.2. Scattering by atomsIn order to consider the electron cloud in an atom, the heterogeneous refractive index distribution of the atomic structure at X-ray wavelength region was theoretically investigated. The characteristics of X-ray scattering based on dielectric cylindrical model which has heterogeneous index is analyzed. This analysis used finite element method in atomic regions and boundary element method in other regions. The distribution of electric field in a carbon atom was estimated.3. Analysis of X-ray reflection on multilayrThe reflection and transmission characteristics of soft X-rays of multilayr mirrors was examined for low-loss X-ray waveguide. The dependence of reflectiveity on incident angle, wavelength and number of layrs for Rh/Si multilayr mirror was evaluated. It was found that 60% reflectivity can be realized at the wavelength of 200A for an incedent angle of 80.4. X-ray deviceAn X-ray focusing device using a graded index medium was studied. The focusing characteristcs were analyzed by ray tracing method. It was shown that X-ray can be converged by this device. The electric fields of the device were also investigated by beam propagation method.