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Proceedings Paper

Surface characterization of an XMM mandrel at the European Synchrotron Radiation Facility: part II
Author(s): Samuel Gougeon; Olivier Hignette; Andreas K. Freund; Ulrich Lienert; Philippe Gondoin; Daniel de Chambure
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Paper Abstract

In a previous paper, we described the experimental set-up and requirements used to study an XMM mandrel by x-ray angle-resolved scattering (ARS). We presented first results and compared them to micro-profilometry data. Here we complete the description of the experimental method and the data analysis of the x-ray ARS studies. We point out several pitfalls and propose solutions to avoid them. We emphasize the need to span a wide intensity dynamical range and the importance to separate the intensities form the specular and the scattered beams. This separation is of particular interest for estimating the rms-roughness from the power spectral density, modeled by a power-law of the spatial frequency. We then compare the results for the roughness with those obtained from profiler measurements. In a second part, the figure measurements of the XMM mandrel are described and analyzed in detail. They have been carried out with both an x-ray pencil beam and an optical long trace profiler. In particular, much attention has been given to the determination of the angle between the two sections of the Wolter I optical configuration and to the effect of the mandrel mounting supports. The PSD was completed with the low-frequency results. Finally, the surface data from the earlier experiment on the Ni-coated normally-polished paraboloid and the superpolished hyperboloid were used to predict the image quality of a Wolter I type optics having the same surface characteristics. The influence of different surface finishes on the image point spread function of a grazing incidence mirror is discussed.

Paper Details

Date Published: 19 July 1996
PDF: 18 pages
Proc. SPIE 2805, Multilayer and Grazing Incidence X-Ray/EUV Optics III, (19 July 1996); doi: 10.1117/12.245082
Show Author Affiliations
Samuel Gougeon, European Synchrotron Radiation Facility (France)
Olivier Hignette, European Synchrotron Radiation Facility (France)
Andreas K. Freund, European Synchrotron Radiation Facility (France)
Ulrich Lienert, European Synchrotron Radiation Facility (France)
Philippe Gondoin, ESTEC (Netherlands)
Daniel de Chambure, ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 2805:
Multilayer and Grazing Incidence X-Ray/EUV Optics III
Richard B. Hoover; Arthur B. C. Walker II, Editor(s)

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