21 January 1993 Surface finish quality of the outer AXAF mirror pair based on x-ray measurements of the VETA-I
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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.
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John P. Hughes, Daniel A. Schwartz, Andrew H. Szentgyorgyi, Leon P. Van Speybroeck, Ping Zhao, "Surface finish quality of the outer AXAF mirror pair based on x-ray measurements of the VETA-I", Proc. SPIE 1742, Multilayer and Grazing Incidence X-Ray/EUV Optics for Astronomy and Projection Lithography, (21 January 1993); doi: 10.1117/12.140549; https://doi.org/10.1117/12.140549
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KEYWORDS
Data modeling

X-rays

Mirrors

Surface finishing

Scattering

Contamination

Surface roughness

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