Surface finish quality of the outer AXAF mirror pair based on x ray measurements of the VETA-I

Details Surface finish quality of the outer AXAF mirror pair based on x ray measurements of the VETA-I Surface finish quality of the outer AXAF mirror pair based on x ray measurements of the VETA-I

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992veta.nasa.....h&link_type=abstract

In its VETA-I X Ray Test Analysis 10 p (SEE N93-26183 09-74)

Astronomy and Astrophysics

Astrophysics

Calibrating, Distortion, Mirrors, Surface Finishing, X Ray Astrophysics Facility, X Ray Sources, Contamination, Radii, Scanners, Shapes

Scientific paper

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 one dimensional scans of the core of the point response function (PRF) (full width half maximum (FWHM) scans), the encircled energy as a function of radius, and one dimensional scans of the wings of the PRF. We discuss briefly our ray trace 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(exp -1). Constraints on the average amplitude of circumferential slope errors are derived as well.

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