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Bragg-case x-ray dynamical diffraction propagator in SRW: application to thin crystal phase retarders

DOI: 10.1117/12.2567341 DOI Help

Authors: John P. Sutter (Diamond Light Source) , Oleg Chubar (NSLS-II, Brookhaven National Laboratory) , Alexey Suvorov (NSLS-II, Brookhaven National Laboratory) , Christie Nelson (NSLS-II, Brookhaven National Laboratory) , Kawal Sawhney (Diamond Light Source)
Co-authored by industrial partner: Yes

Type: Conference Paper
Conference: Advances in Computational Methods for X-Ray Optics V
Peer Reviewed: No

State: Published (Approved)
Published: August 2020

Abstract: A Bragg-case X-ray dynamical diffraction propagator has already been integrated into the “Synchrotron Radiation Workshop” (SRW) physical optics simulation software package. Previous benchmarking tests on crystal monochromators assumed thicknesses many times the extinction length, for which transmission is negligible. This paper reports tests of this propagator applied to thin crystals in transmission. The chosen example is a phase retarder, which allows users to alter the polarization of an X-ray beam. Phase retarders are often applied to studies of solid-state materials with hard X-rays, which current medium-energy storage ring synchrotron sources typically produce only with linear polarization. Correct designs of phase retarders require the accurate determination of both the intensity and the phase of the diffracted wave in all polarization states. First, to approximate an incident plane wave, SRW is used to simulate the passage of a Gaussian beam of very large radius of curvature through the phase retarder. Then, the phase retarder’s effects on a typical undulator beam are simulated and the results are compared. Because X-ray phase retarders are highly sensitive to angular alignment, tolerances in misalignment are also determined. SRW simulations are compared with experimental data from the Integrated In Situ and Resonant Hard X-ray Studies (ISR) beamline at NSLSII. The design of phase retarders can therefore be optimized for X-ray beamlines that must combine variable polarization with focusing or other properties.

Journal Keywords: SRW; X-ray; Bragg; crystal; phase retarder; phase plate; physical optics; dynamical diffraction

Subject Areas: Technique Development

Facility: Beamline 4-ID at National Synchrotron Light Source II

Added On: 25/08/2020 10:08

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