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11 October 1989 Measurement Of The Effects Of Particulate Contamination On X-Ray Reflectivity
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Because particles of sizes larger than a few tenths microns adversely affect hight resolution X-ray telescopes by scattering and absorbing X-rays, we are investigating the clean-liness required to maintain the ~1% overall calibration precision desired for the Advanced X-ray Astrophysics Facility (AXAF). At the grazing angles used for the AXAF mirrors, each particle shadows a surface area ~ 102 times its geometric area, necessitating glass occlusion specifications much more stringent than typically stipulated for visible-light particulate contamination. On test fiats coated with gold, we have deposited controlled levels of contamination spanning the range from 5 x 10-5 to 5 x 10-3 fractional area covered and have measured the absorption component of extinction over a range of grazing angles and X-ray energies to verify the predicted effects of particulate contamination. Further tests are planned to examine a wider range of energies and to take into account sample flatness and distortions introduced by holding fixtures.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. Slane, E. R. McLaughlin, D. A. Schwartz, L. P. Van Speybroeck, J. W. Bilbro, and B. H. Nerren "Measurement Of The Effects Of Particulate Contamination On X-Ray Reflectivity", Proc. SPIE 1113, Reflective Optics II, (11 October 1989);


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