Measurement of the effects of particulate contamination on X-ray reflectivity

Details Measurement of the effects of particulate contamination on X-ray reflectivity Measurement of the effects of particulate contamination on X-ray reflectivity

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1113...12s&link_type=abstract

IN: Reflective optics II; Proceedings of the Meeting, Orlando, FL, Mar. 27-29, 1989 (A90-39027 17-74). Bellingham, WA, Society o

Astronomy and Astrophysics

Astrophysics

Contamination, Optical Measurement, Particulates, Reflectance, X Ray Astrophysics Facility, X Ray Scattering, Grazing Incidence, High Resolution, Mirrors, Particle Size Distribution

Scientific paper

Because particles of sizes larger than a few tenths microns adversely affect high resolution X-ray telescopes by scattering and absorbing X-rays, the cleanliness required to maintain the about 1 percent overall calibration precision desired for the Advanced X-ray Astrophysics Facility (AXAF) is being investigated. At the grazing angles used for the AXAF mirrors, each particle shadows a surface area about 100 times its geometric area, necessitating glass occlusion specifications much more stringent than typically stipulated for visible-light particulate contamination. On test flats coated with gold, controlled levels of contamination have been deposited spanning the range from 5 x 10 to the -5th to 0.005 fractional area covered, and the absorption component of extinction has been measured over a range of grazing angles and X-ray energies to verify the predicted effects of particulate contamination.

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