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25 August 2020 CPU and memory efficient coherent mode decomposition for the partially coherent x-ray simulations
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Abstract
The method of the Coherent Mode Decomposition (CMD) is applied to numerical wave propagation calculations for partially-coherent X-rays, using the Fourier optics and compatible methods. Its CPU and memory efficiency is discussed in various cases of the wavefront at the source and the beam waist. With the absence of the quadratic phase terms, the required sampling density of the electric fields is effectively reduced. The problem size is thus moderate and the method is feasible to be implemented on a single-node CPU server. In other cases, the same argument holds with proper treatments of the quadratic phase terms. Tests on CMD and the modes propagation are done for the case of the Coherent Hard X-ray beamline of the National Synchrotron Light Source II, using the Synchrotron Radiation Workshop software. We observe a few hundred or less dominant decomposed modes that resemble the electric fields converge to the wavefront intensity at a high accuracy of over 99%.
Conference Presentation
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Ruizi Li and Oleg Chubar "CPU and memory efficient coherent mode decomposition for the partially coherent x-ray simulations", Proc. SPIE 11493, Advances in Computational Methods for X-Ray Optics V, 114930G (25 August 2020); https://doi.org/10.1117/12.2569058
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