Kohn V G
National Research Centre `Kurchatov Institute', 123182 Moscow, Russia.
J Synchrotron Radiat. 2022 May 1;29(Pt 3):615-621. doi: 10.1107/S1600577522001345. Epub 2022 Mar 14.
Two new methods of computer simulation of synchrotron radiation nanofocusing with planar compound refractive lenses (PCRLs) are presented. The methods are based on the results of analytical theory. In contrast to previous works, the new methods take into account the PCRL aperture. It is especially important at high photon energies, when absorption is low and the calculations based on analytical theory, i.e. without taking into account the aperture, give incorrect results. A computer program was created and specific results were obtained for a silicon PCRL having an aperture of 50 µm, element length of 102 µm and minimum thickness of 2 µm. For an energy of 50 keV and number of elements 300, it focuses the beam to 31 nm size at a distance of one and a half times its length. Analysis of the calculation accuracy for the proposed methods is performed, as well as a demonstration of the capabilities of the computer program.
提出了两种用平面复合折射透镜（PCRL）对同步辐射纳米聚焦进行计算机模拟的新方法。这些方法基于解析理论的结果。与之前的工作不同，新方法考虑了PCRL的孔径。在高光子能量下，当吸收较低且基于解析理论（即不考虑孔径）的计算会给出错误结果时，这一点尤为重要。创建了一个计算机程序，并针对孔径为50 µm、元件长度为102 µm且最小厚度为2 µm的硅PCRL获得了具体结果。对于50 keV的能量和300个元件，它在距离其长度1.5倍的位置将光束聚焦到31 nm的尺寸。对所提出方法的计算精度进行了分析，并展示了该计算机程序的功能。
