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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2020
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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. |
format | Online Article Text |
id | pubmed-7842205 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | International Union of Crystallography |
record_format | MEDLINE/PubMed |
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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