Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27.1404a&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
112
Grazing Incidence, Rosat Mission, Spaceborne Telescopes, X Ray Astronomy, Design Analysis, Mirrors, Optical Properties, Surface Geometry
Scientific paper
A grazing incidence telescope has been developed for the X-ray astronomy satellite Rosat including a verification model and a flight model. The telescope consists of a four-fold nested Wolter type I mirror assembly of 84-cm front aperture and 240-cm focal length. The verification model has been built and fully assembled to a telescope. Full aperture X-ray measurements performed in a 130-m long-beam facility are presented and successfully compared with model predictions based on mirror metrology data. An energy independent angular resolution of 4-sec of arc half-energy width for the encircled point spread function and a mirror surface microroughness of less than 3 A have been achieved. Metrology of the actual flight mirrors (although not yet assembled to a telescope) indicates an even better performance.
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