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Proceedings Paper

Surface finish quality of the outer AXAF mirror pair based on x-ray measurements of the VETA-I
Author(s): John P. Hughes; Daniel A. Schwartz; Andrew H. Szentgyorgyi; Leon P. Van Speybroeck; Ping Zhao
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Paper Abstract

We employ the X-ray measurements of the VETA-I taken at the X-Ray Calibration Facility (XRCF) of the Marshall Space Flight Center (MSFC) to extract information about the surface finish quality of the outermost pair of AXAF mirrors. The particular measurements we consider are 1D scans of the core of the point response function (PRF) (FWHM scans), the encircled energy as a function of radius, and 1D scans of the wings of the PRF. We discuss briefly our raytrace model which incorporates the numerous effects present in the VETA-I test, such as the finite source distance, the size and shape of the X-ray source, the residual gravitational distortions of the optic, the despace of the VETA-I, and particulate contamination. We show how the data constrain the amplitude of mirror surface deviations for spatial frequencies greater than about 0.1/mm. Constraints on the average amplitude of circumferential slope errors are derived as well.

Paper Details

Date Published: 21 January 1993
PDF: 10 pages
Proc. SPIE 1742, Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography, (21 January 1993); doi: 10.1117/12.140549
Show Author Affiliations
John P. Hughes, Smithsonian Astrophysical Observatory (United States)
Daniel A. Schwartz, Smithsonian Astrophysical Observatory (United States)
Andrew H. Szentgyorgyi, Smithsonian Astrophysical Observatory (United States)
Leon P. Van Speybroeck, Smithsonian Astrophysical Observatory (United States)
Ping Zhao, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 1742:
Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography
Richard B. Hoover; Arthur B. C. Walker, Editor(s)

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