激光等离子体诊断用Wolter型X射线显微镜的设计

Optical design of Wolter X-ray microscope for laser plasma diagnostics

围绕着稠密等离子体硬X射线成像诊断,提出了一种基于阿贝正弦条件的Wolter型X射线显微镜的光学系统设计。详细介绍了Wolter显微镜的结构特点和设计方法,进行了参数优化,定量分析了包括物距、放大倍数、掠入射角和双曲面镜镜长在内的初始结构参数对物镜性能的影响。由光线追迹可以得出,在约±260μm的视场范围内分辨率优于1μm;在±460μm范围内优于3μm。有效视场可达约1mm,几何集光立体角约为6.1×10^(-5)sr。同时,该系统具备平响应系统特性,在mm级的视场范围内,系统响应效率的一致性优于93.7%。

Based on the urgent need of conducting imaging diagnostics of dense laser-produced plasma,we present the optical system design of Wolter type X-ray microscope based on Abbe＇s sine condition.This paper details the structural features and optical design approaches of Wolter microscope.The impacts of initial structure parameters including the object distance,magnification,grazing angle and mirror length of hyperbolic mirror on objective performance are studied quantitatively.According to raytracing simulation,the spatial resolution is better than 1μm in a range of ±260μm and better than 3μm in a range of ±460μm.The effective field of view is estimated as about 1 mm in diameter with a geometric solid angle of 6.1×10^-5 sr.The system is flatresponse with an efficiency consistency of 93.7% over the field of view.This paper contributes to the development of high-resolution and high-flux hard X-ray imaging diagnostic instruments in the future.