Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Nistea, Ioana T., Alcock, Simon G., Kristiansen, Paw, Young, Adam
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2017
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
_version_ 1783244801734344704
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
work_keys_str_mv AT nisteaioanat longellipticallybentactivexraymirrorswithslopeerrors200nrad
AT alcocksimong longellipticallybentactivexraymirrorswithslopeerrors200nrad
AT kristiansenpaw longellipticallybentactivexraymirrorswithslopeerrors200nrad
AT youngadam longellipticallybentactivexraymirrorswithslopeerrors200nrad