ROSAT Wide Field Camera Mirrors

R. Willingale

doi:10.1117/12.942156

9 August 1988 ROSAT Wide Field Camera Mirrors

R. Willingale

Proceedings Volume 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications; (1988) https://doi.org/10.1117/12.942156
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

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.

Citation Download Citation

R. Willingale "ROSAT Wide Field Camera Mirrors", Proc. SPIE 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications, (9 August 1988); https://doi.org/10.1117/12.942156

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KEYWORDS

Mirrors

Scattering

Extreme ultraviolet

Sensors

Error analysis

Gold

Reflectivity

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