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Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad
Actively bent X-ray mirrors are important components of many synchrotron and X-ray free-electron laser beamlines. A high-quality optical surface and good bending performance are essential to ensure that the X-ray beam is accurately focused. Two elliptically bent X-ray mirror systems from FMB Oxford...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5477481/ https://www.ncbi.nlm.nih.gov/pubmed/28452753 http://dx.doi.org/10.1107/S1600577517005422 |
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author | Nistea, Ioana T. Alcock, Simon G. Kristiansen, Paw Young, Adam |
author_facet | Nistea, Ioana T. Alcock, Simon G. Kristiansen, Paw Young, Adam |
author_sort | Nistea, Ioana T. |
collection | PubMed |
description | Actively bent X-ray mirrors are important components of many synchrotron and X-ray free-electron laser beamlines. A high-quality optical surface and good bending performance are essential to ensure that the X-ray beam is accurately focused. Two elliptically bent X-ray mirror systems from FMB Oxford were characterized in the optical metrology laboratory at Diamond Light Source. A comparison of Diamond-NOM slope profilometry and finite-element analysis is presented to investigate how the 900 mm-long mirrors sag under gravity, and how this deformation can be adequately compensated using a single, spring-loaded compensator. It is shown that two independent mechanical actuators can accurately bend the trapezoidal substrates to a range of elliptical profiles. State-of-the-art residual slope errors of <200 nrad r.m.s. are achieved over the entire elliptical bending range. High levels of bending repeatability (ΔR/R = 0.085% and 0.156% r.m.s. for the two bending directions) and stability over 24 h (ΔR/R = 0.07% r.m.s.) provide reliable beamline performance. |
format | Online Article Text |
id | pubmed-5477481 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | International Union of Crystallography |
record_format | MEDLINE/PubMed |
spelling | pubmed-54774812017-06-27 Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad Nistea, Ioana T. Alcock, Simon G. Kristiansen, Paw Young, Adam J Synchrotron Radiat Research Papers Actively bent X-ray mirrors are important components of many synchrotron and X-ray free-electron laser beamlines. A high-quality optical surface and good bending performance are essential to ensure that the X-ray beam is accurately focused. Two elliptically bent X-ray mirror systems from FMB Oxford were characterized in the optical metrology laboratory at Diamond Light Source. A comparison of Diamond-NOM slope profilometry and finite-element analysis is presented to investigate how the 900 mm-long mirrors sag under gravity, and how this deformation can be adequately compensated using a single, spring-loaded compensator. It is shown that two independent mechanical actuators can accurately bend the trapezoidal substrates to a range of elliptical profiles. State-of-the-art residual slope errors of <200 nrad r.m.s. are achieved over the entire elliptical bending range. High levels of bending repeatability (ΔR/R = 0.085% and 0.156% r.m.s. for the two bending directions) and stability over 24 h (ΔR/R = 0.07% r.m.s.) provide reliable beamline performance. International Union of Crystallography 2017-04-19 /pmc/articles/PMC5477481/ /pubmed/28452753 http://dx.doi.org/10.1107/S1600577517005422 Text en © Ioana T. Nistea et al. 2017 http://creativecommons.org/licenses/by/2.0/uk/ 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/2.0/uk/ |
spellingShingle | Research Papers Nistea, Ioana T. Alcock, Simon G. Kristiansen, Paw Young, Adam Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title | Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title_full | Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title_fullStr | Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title_full_unstemmed | Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title_short | Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad |
title_sort | long, elliptically bent, active x-ray mirrors with slope errors <200 nrad |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5477481/ https://www.ncbi.nlm.nih.gov/pubmed/28452753 http://dx.doi.org/10.1107/S1600577517005422 |
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