{"title":"Computer Simulation of the Effect of Focusing X Rays by Means of Refractive–Diffractive Lens","authors":"V. G. Kohn","doi":"10.1134/S1063774524600467","DOIUrl":null,"url":null,"abstract":"<p>The features of focusing X rays using a refractive–diffractive lens (RDL), which is a system of two asymmetrically reflecting crystals with asymmetry factors whose product is equal to unity, and a refractive lens with a large focal length, are theoretically studied. Crystals make it possible to shorten the focal length of the lens by <i>b</i><sup>2</sup> times, where <i>b</i> is the asymmetry factor of the second crystal. A detailed numerical simulation of the effect of radiation focusing using the RDL has been performed. The universal computer program XRWP was used, which was created to calculate the effects of coherent X-ray optics. Analytical formulas are obtained for the optimal aperture and radius of curvature of the lens, as well as for the width of the radiation spectrum that can be focused.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 4","pages":"459 - 465"},"PeriodicalIF":0.6000,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S1063774524600467","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
引用次数: 0
Abstract
The features of focusing X rays using a refractive–diffractive lens (RDL), which is a system of two asymmetrically reflecting crystals with asymmetry factors whose product is equal to unity, and a refractive lens with a large focal length, are theoretically studied. Crystals make it possible to shorten the focal length of the lens by b2 times, where b is the asymmetry factor of the second crystal. A detailed numerical simulation of the effect of radiation focusing using the RDL has been performed. The universal computer program XRWP was used, which was created to calculate the effects of coherent X-ray optics. Analytical formulas are obtained for the optimal aperture and radius of curvature of the lens, as well as for the width of the radiation spectrum that can be focused.
折射衍射透镜（RDL）是由两个不对称反射晶体（其不对称系数的乘积等于一）和一个大焦距折射透镜组成的系统，本文从理论上研究了使用该透镜聚焦 X 射线的特点。晶体可以使透镜的焦距缩短 b2 倍，其中 b 是第二个晶体的不对称系数。对使用 RDL 进行辐射聚焦的效果进行了详细的数值模拟。使用的通用计算机程序 XRWP 是为计算相干 X 射线光学效应而创建的。该程序获得了透镜的最佳孔径和曲率半径以及可聚焦辐射光谱宽度的分析公式。
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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