毛细管X光平行束透镜坪区特性的研究  

Plateau area characteristics of poly-capillary parallel X-ray lens

作　　者：王逸凡 陈佳睿 刘志国[2] WANG Yifan;CHEN Jiarui;LIU Zhiguo(Department of Physics,Beijing Normal University,100875,Beijing,China;College of Nuclear Science and Technology,Beijing Normal University,100875,Beijing,China)

机构地区：[1]北京师范大学物理学系,北京100875 [2]北京师范大学核科学与技术学院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2022年第1期18-24,共7页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11875087)。

摘　　要：玻璃对X射线的折射率接近1,无法使用传统的光学透镜对其进行会聚或平行调控.将大量毛细管按照一定方式排列组合,在符合全反射原理的情况下,对点X光源发射的X射线进行调控;着重于研究整体毛细管X光平行束透镜,利用光线追迹法进行数值模拟,设计仿真模拟程序,模拟出X射线在整体毛细管X光平行束透镜中的传播路径;通过改变毛细管的子管参数和排列方式,使毛细管X光平行束透镜的出射光束出现光束坪区,并设计出出光均匀性80%以上的毛细管X光平行束透镜;通过试验分别使用等径和变径毛细管X光平行束透镜对X点光源进行成像,验证了变径优化对出射光束均匀性的改善作用,其中变径X光平行束透镜的出射光束的发散角低至11.7 mrad.Refractive index of glass to X-rays is typically close to 1,so traditional optical lenses cannot be used to converge or control them in parallel.Under the condition of total reflection,direction of X-ray propagation can be guided by changing direction of the center line of capillary tube.A large number of capillaries are arranged and combined in a certain way to control X-rays emitted by point X light source.Here we studied overall poly-capillary parallel X-ray lens,using ray tracing for numerical simulation,designing a simulation program to simulate the propagation path of X-rays in overall poly-capillary parallel X-ray lens.With changing capillary sub-tube parameters and arrangement method,the output beam of capillary X-ray collimated beam lens appeared in the beam plateau,and a poly-capillary parallel X-ray lens with a light uniformity of more than 80%was designed.Equal-diameter and variable-diameter capillary parallel X-ray lenses were used to image point source X-rays,verifying effect of variablediameter optimization on uniformity of emitted beam.Divergence angle of outgoing beam of variable-diameter X-ray lens was found to be as low as 11.7 mrad.

关 键 词：X射线光学 毛细管X光平行束透镜 光线追迹法 全反射 坪区 

分 类 号：O434.1[机械工程—光学工程]