Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27.1423w&link_type=abstract
(SPIE, Conference on Grazing Incidence Optics for Astronomical and Laboratory Applications, San Diego, CA, Aug. 17-19, 1987) App
Astronomy and Astrophysics
Astronomy
10
Cameras, Mirrors, Rosat Mission, Spaceborne Astronomy, Ultraviolet Astronomy, Extreme Ultraviolet Radiation, Grazing Incidence, Surface Roughness
Scientific paper
The Rosat wide field camera is an XUV telescope operating in the 12-250-eV energy band. The mirror system utilizes Wolter-Schwarzschild type I grazing incidence optics with a focal length of 525 mm, comprised of three nested aluminum shells with an outermost diameter of 576 mm which provide a geometric aperture area of 456 sq cm. The reflecting surfaces are coated with gold to enchance their reflectivity in the XUV. The mirrors have undergone full aperture optical testing, narrow beam XUV testing, and full aperture XUV testing. Measurements of the reflectivity are compared to theoretical values derived from the optical constants of gold in the XUV range. Analysis of the focused distribution is used to estimate the surface roughness and figuring errors of the polished surfaces. The results are compared to the mechanical metrology data collected during manufacture of the shells, and the power spectral density of the reflecting surfaces is found to have a power-law form.
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