Polycapillary-based X-ray optics
Polycapillary-based X-ray optics
复制标题
基于多毛细管的 X 射线光学器件
DOI：
10.1016/0168-9002(94)91913-5
复制
发表时间：
1994
影响因子：
1.4
通讯作者：
S. V. Poturaev
中科院分区：
文献类型：
--
作者：
Q. Xiao;S. V. Poturaev
玻璃毛细管可以通过多次全反射引导宽能量范围的 X 射线。弯曲多毛细管纤维阵列具有许多潜在功能，包括光束收集和聚焦、光束准直和能量过滤。测量了点 X 射线源的 CuKα 辐射和轫致辐射辐射通过直和弯曲多毛细管纤维引导的 X 射线的传输效率和出射发散度。实验结果与光线追踪模拟进行了比较。两者之间的良好一致性表明模拟可以可靠地描述 X 射线通过光滑玻璃毛细管的传播。相同的模拟程序已用于表征基于毛细管的 X 射线透镜的性能，该透镜收集并准直来自阳极源的 X 射线以用于衍射应用。预计微球面度内的光子通量将增加 250 倍。
Glass capillaries can guide a broad energy range of X rays by means of multiple total reflections. Arrays of curved polycapillary fibers have many potential functions, including beam collection and focusing, beam collimation and energy filtering. The transmission efficiency and exit divergence of X rays guided through straight and bent polycapillary fibers have been measured for CuKαradiation and bremsstrahlung radiation from a point X-ray source. Experimental results have been compared with ray-tracing simulations. The good agreement between the two indicates that simulations can reliably describe the propagation of X rays through smooth glass capillaries. The same simulation program has been used to characterize the performance of a capillary-based X-ray lens which collects and collimates X rays from an anode source for use in diffraction applications. A 250-fold enhancement of photon flux within a microsteradian is predicted.