Fundamental research on low-loss X-ray fibers and high performance X-ray optical device.

1.假设原子是一个理想的导电柱，我们用BEM在原子水平上分析了X射线的反射和散射特性。假设晶体中的一组原子是一个介质柱，我们分析了入射到晶体上的X射线的传输和散射特性，能够显示出相对于原子阵列的散射强度。考虑到电子在原子内部的运动，我们可以用非均匀折射率散射模型来分析单个原子的X射线散射。该模型以X射线影响下的电子能级作为参数。证实了X射线激发的电子与折射率分布之间的强相关性，以及X射线强度分布分析结果与原子内折射率分布的相关性。将这种对单原子的分析推广到多原子模型。除了用于这一…的Si/Mo，铂在更多的研究中，我们选择了Ag/La和Rh/Ce作为X射线多层膜反射镜的材料，并探索了波长、层数和入射角的关系。假设入射角接近光纤传输的临界角，对反射率进行了优化，得到了良好的反射率特性。在X射线屏蔽的研究中，将用于微波领域的吸波材料应用于多层结构，分析了X射线区域的特性。因此，作为梯度折射率多层膜的一个特征，我们可以看到可以提高吸收效率，以减少反射和透射率。分析了近临界角的全折射和透射率。考察了介质常数的依赖关系和空间光谱的变化。利用弯曲X射线聚焦波导分析了该模型在曲率处的传输特性，并研究了该模型的模式转换和光斑扩展。因此，我们可以对X射线波导及其传播特性有一个基本的了解。根据理论结果，了解了X射线在渐变折射率型波导中的聚焦情况。还探讨了在更真实的模型中，在核心有损耗的情况下高斯光束的聚焦问题。此外，用有限元和有限元方法分析了X射线平面波输入的锥形波导探头内部和外部的电场分布，确定了X射线平面波的聚焦。较少

1. Assuming atom to be a perfect conducting cylinder, we analyzed reflection and scattering characteristics of X-rays at the atomic level, using BEM.Assuming a group of atoms within the crystal to be a dielectric cylinder, we analyzed transmission and scattering characteristics of X-rays incident on the crystal and were able to show the scattering intensity with respect to the array of atoms.2. Considering the motion of electrons within the atom, we could analyze X-ray scattering of a single atom using an inhomogeneous refractive index scattering model. Energy level of electron affected by X-rays is used as a parameter in this model. Strong correlation between electrons excited due to X-rays and index distribution, and also the correlation of results of X-ray intensity distribution analysis with the index distribution within the atom were confirmed. This analysis for a single atom was extended to the analysis multiple atom models.3. In addition to Si/Mo, Pt which had been used for this … More research as materials of the X-ray multi-layr mirror, we chose Ag/La and Rh/Ce and explored the dependence of wave length, number of layrs and incident angle. Assuming the incident angle to be near critical angles as in fiber transmission, we optimized the reflectivity, which resulted in good reflectivity characteristics.4. In the research of X-ray shield, by applying the wave absorber used in microwave region to a multi-layr structure we analyzed the characteristics in the region of X-rays. As a result, as a feature of the multi-layr with gradient type refractive index, we could see that absorption efficiency could be increased in order to reduce reflection and transmission.5. Total refraction and transmission at the near critical angle were analyzed. The dependence of the medium constants and the change due to spatial spectrum were examined. Propagation characteristics at the curvature were analyzed using a curved X-ray focusing waveguide, and mode conversion and spreading of beam spot of this model were investigated. As a result we could gain a fundamental knowledge of an X-ray waveguide and the propagation characteristics.6. According to the theoretical results, focusing of X-rays in graded-index type waveguide was understood. Focusing of a gauss beam in a more realistic model with loss at the core was also explored. In addition, electric field distribution inside and outside of tapered waveguide probe, with an X-ray plane wave input, was analyzed using FEM and BEM.The focusing of the X-ray plane wave was confirmed. Less