Design of X-ray supermirrors

被引：96

作者：

Kozhevnikov, Igor V. ^{[1
]}

Bukreeva, Inna N. ^{[1
]}

Ziegler, Eric ^{[2
]}

机构：

[1] Lebedev Physical Institute, Leninsky Prospect 53, 117934, Moscow, Russia

[2] Europ. Synchrt. Radiation Facility, BP 220, 38043 Grenoble Cedex, France

来源：

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2001年 / 460卷 / 2-3期

关键词：

Inverse problems - Multilayers - Optical coatings - Synchrotrons - X ray optics;

D O I：

10.1016/S0168-9002(00)01079-2

中图分类号：

学科分类号：

摘要：

A new approach is proposed for the design of wide band-pass multilayer optical elements operating in the hard X-ray spectral region. The method, based on the combination of analytical and numerical methods, solves the inverse problem consisting of inferring the composition profile of a depth-graded multilayer coating. The key feature of our approach consists in using an analytical expression for the depth-distribution of the period as initial solution for direct computer calculations. This allows a global minimization of the merit function and a many-fold decrease of the computer run time. Simulations of two particular cases are presented: a constant reflectivity over a wide spectral range and a complicated reflectivity profile. The best choice of material pairs for composing a depth-graded multilayer structure is discussed from the viewpoint of maximum achievable reflectivity and least number of bi-layers. Features of depth-graded multilayer mirrors, which are distinctive from conventional periodic mirrors, are examined. The factors influencing the optical quality of broad-band multilayers are also considered.

引用

页码：424 / 443