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A high-accuracy complex-phase method of simulating X-ray propagation through a multi-lens system

Abstract

The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. For solving the problem for an electromagnetic wave, a finite-difference method is applied. The error of simulation is analytically estimated and investigated. It was found that a very detailed difference grid is required for reliable and accurate calculations of the propagation of X-ray waves through a multi-lens system. The reasons for using a very detailed difference grid are investigated. It was shown that the wave phase becomes a function, very quickly increasing with increasing distance from the optical axis, after the wave has passed through the multi-lens system. If the phase is a quickly increasing function of the coordinates perpendicular to the optical axis, then the electric field of the wave is a quickly oscillating function of these coordinates, and thus a very detailed difference grid becomes necessary to describe such a wavefield. To avoid this difficulty, an equation for the phase function is proposed as an alternative to the equation of the electric field. This allows reliable and accurate simulations to be carried out when using the multi- lens system. An equation for the phase function is derived and used for accurate simulations. The numerical error of the suggested method is estimated. It is shown that the equation for the phase function allows efficient simulations to be fulfilled for the multi-lens system.

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Details

Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
JOURNAL OF SYNCHROTRON RADIATION no. 23, edition 6, pages 1305 - 1314,
ISSN: 1600-5775
Language:
English
Publication year:
2016
Bibliographic description:
Kshevetskii S., Wojda P., Maximov V.: A high-accuracy complex-phase method of simulating X-ray propagation through a multi-lens system// JOURNAL OF SYNCHROTRON RADIATION. -Vol. 23, iss. 6 (2016), s.1305-1314
DOI:
Digital Object Identifier (open in new tab) 10.1107/s1600577516013333
Verified by:
Gdańsk University of Technology

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