On the Numerical Modeling of Track-Etched Membranes Used as Collimators of the X-Ray Radiation

In this work, we present the results of numerical modeling of distribution of the field amplitude inside micron-sized through cylindrical pores in polymer track membranes in the soft X-ray wavelength range 13.5–30.4 nm. The calculations were performed by numerically solving the 3 D -parabolic equati...

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Bibliographic Details
Published in:Technical physics 2024-05, Vol.69 (5), p.1282-1286
Main Authors: Mitrofanov, A. V., Feshchenko, R. M.
Format: Article
Language:English
Subjects:
Boundary conditions
Classical and Continuum Physics
Diameters
Finite difference method
Incidence angle
Membranes
Numerical models
Physics
Physics and Astronomy
Soft x rays
Surface roughness
Thickness measurement
Transition layers
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Summary:In this work, we present the results of numerical modeling of distribution of the field amplitude inside micron-sized through cylindrical pores in polymer track membranes in the soft X-ray wavelength range 13.5–30.4 nm. The calculations were performed by numerically solving the 3 D -parabolic equation with a finite-difference method using an exact transparent boundary condition. The dependences of the X-ray transmittivity through a pore on the incidence angle as well as on the pore diameter were computed. For the membranes with some thicknesses and pore diameters calculated angular dependences of the transmittance are compared with the measurements known from the literature. It is demonstrated that the calculations agree with the measurements if a transition layer on the inner surface of the pores, which accounts for the finite surface roughness, is introduced.
ISSN:1063-7842
1090-6525
DOI:10.1134/S106378422404025X