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Focusing a round coherent beam by spatial filtering the horizontal source

This paper illustrates the use of spatial filtering with a horizontal slit near the source to enlarge the horizontal coherence in an experimental station and produce a diffraction-limited round focus at an insertion device beamline for X-ray photon correlation spectroscopy experiments. Simple expres...

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Autores principales: Dufresne, Eric M., Narayanan, Suresh, Reininger, Ruben, Sandy, Alec R., Lurio, Larry
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842205/
https://www.ncbi.nlm.nih.gov/pubmed/33147178
http://dx.doi.org/10.1107/S1600577520012163
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author Dufresne, Eric M.
Narayanan, Suresh
Reininger, Ruben
Sandy, Alec R.
Lurio, Larry
author_facet Dufresne, Eric M.
Narayanan, Suresh
Reininger, Ruben
Sandy, Alec R.
Lurio, Larry
author_sort Dufresne, Eric M.
collection PubMed
description This paper illustrates the use of spatial filtering with a horizontal slit near the source to enlarge the horizontal coherence in an experimental station and produce a diffraction-limited round focus at an insertion device beamline for X-ray photon correlation spectroscopy experiments. Simple expressions are provided to guide the optical layout, and wave propagation simulations confirm their applicability. The two-dimensional focusing performance of Be compound refractive lenses to produce a round diffraction-limited focus at 11 keV capable of generating a high-contrast speckle pattern of an aerogel sample is demonstrated. The coherent scattering patterns have comparable speckle sizes in both horizontal and vertical directions. The focal spot sizes are consistent with hybrid ray-tracing calculations. Producing a two-dimensional focus on the sample can be helpful to resolve speckle patterns with modern pixel array detectors with high visibility. This scheme has now been in use since 2019 for the 8-ID beamline at the Advanced Photon Source, sharing the undulator beam with two separate beamlines, 8-ID-E and 8-ID-I at 7.35 keV, with increased partially coherent flux, reduced horizontal spot sizes on samples, and good speckle contrast.
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spelling pubmed-78422052021-02-05 Focusing a round coherent beam by spatial filtering the horizontal source Dufresne, Eric M. Narayanan, Suresh Reininger, Ruben Sandy, Alec R. Lurio, Larry J Synchrotron Radiat Research Papers This paper illustrates the use of spatial filtering with a horizontal slit near the source to enlarge the horizontal coherence in an experimental station and produce a diffraction-limited round focus at an insertion device beamline for X-ray photon correlation spectroscopy experiments. Simple expressions are provided to guide the optical layout, and wave propagation simulations confirm their applicability. The two-dimensional focusing performance of Be compound refractive lenses to produce a round diffraction-limited focus at 11 keV capable of generating a high-contrast speckle pattern of an aerogel sample is demonstrated. The coherent scattering patterns have comparable speckle sizes in both horizontal and vertical directions. The focal spot sizes are consistent with hybrid ray-tracing calculations. Producing a two-dimensional focus on the sample can be helpful to resolve speckle patterns with modern pixel array detectors with high visibility. This scheme has now been in use since 2019 for the 8-ID beamline at the Advanced Photon Source, sharing the undulator beam with two separate beamlines, 8-ID-E and 8-ID-I at 7.35 keV, with increased partially coherent flux, reduced horizontal spot sizes on samples, and good speckle contrast. International Union of Crystallography 2020-10-20 /pmc/articles/PMC7842205/ /pubmed/33147178 http://dx.doi.org/10.1107/S1600577520012163 Text en © Eric M. Dufresne et al. 2020 http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/4.0/
spellingShingle Research Papers
Dufresne, Eric M.
Narayanan, Suresh
Reininger, Ruben
Sandy, Alec R.
Lurio, Larry
Focusing a round coherent beam by spatial filtering the horizontal source
title Focusing a round coherent beam by spatial filtering the horizontal source
title_full Focusing a round coherent beam by spatial filtering the horizontal source
title_fullStr Focusing a round coherent beam by spatial filtering the horizontal source
title_full_unstemmed Focusing a round coherent beam by spatial filtering the horizontal source
title_short Focusing a round coherent beam by spatial filtering the horizontal source
title_sort focusing a round coherent beam by spatial filtering the horizontal source
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842205/
https://www.ncbi.nlm.nih.gov/pubmed/33147178
http://dx.doi.org/10.1107/S1600577520012163
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