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Proceedings Paper

ROSAT Wide Field Camera Mirrors
Author(s): R. Willingale
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Paper Abstract

The ROSAT wide field camera (WFC) is an XUV telescope operating in the 12-250-eV energy band. The mirror system utilizes Wolter-Schwarzschild type I (WSI) grazing incidence optics with a focal length of 525 mm, comprised of three nested aluminum shells with an outermost diameter of 576 mm providing a geometric aperture area of 456 cm2. The reflecting surfaces are electroless nickel plated and coated with gold to enhance 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.

Paper Details

Date Published: 9 August 1988
PDF: 7 pages
Proc. SPIE 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications, (9 August 1988); doi: 10.1117/12.942156
Show Author Affiliations
R. Willingale, University of Leicester (U.K.)

Published in SPIE Proceedings Vol. 0830:
Grazing Incidence Optics for Astronomical and Laboratory Applications
C. Stuart Bowyer, Editor(s)

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