Computer Science – Performance
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8822836a&link_type=abstract
Presented at the 31st SPIE Annual International Symposium, San Diego, Calif., Aug. 1987
Computer Science
Performance
Grazing Incidence, High Resolution, Rosat Mission, Spaceborne Telescopes, X Ray Telescopes, Angular Resolution, Mirrors, Optical Properties, Point Spread Functions, Surface Roughness
Scientific paper
A grazing incidence telescope has been developed for the X-ray astronomy satellite ROSAT including a verification 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. 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 arcsec half-energy width for the encircled point spread function and a mirror surface microroughness of less than 3 A are achieved. Metrology of the actual flight mirrors (although not yet assembled into a telescope) indicates an even better performance.
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