XSPECT telescopes on the SRG: optical performance

Niels Jørgen Stenfeldt Westergaard, Josef Polny, Finn Erland Christensen, Hans Ulrik Nørgaard-Nielsen, Herbert W. Schnopper

    Research output: Contribution to journalConference articleResearchpeer-review


    The XSPECT, thin foil, multiply nested telescope on SRG has been designed to achieve a large effective area at energies between 6 and 15 keV. The design goal for the angular resolution is 2 arcmin (HPD). Results of foil figure error measurements are presented. A ray tracing analysis was performed including results of earlier scattering measurements and the foil determination. The results of the analysis are compared with test measurements with X rays and show that there is a larger spread in the PSF than the model can account for. The decrease in effective area due to scattering is estimated to be 30% when the photons that scatter more than 6 arcmin are regarded as lost. The vignetting at off-axis angles leads to an effective area at the edge of the FOV which is 15% of that of an on-axis source.
    Original languageEnglish
    JournalProceedings of SPIE, the International Society for Optical Engineering
    Pages (from-to)526-531
    Publication statusPublished - 1994
    EventAdvances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics - San Diego, CA, United States
    Duration: 24 Jul 199424 Jul 1994


    ConferenceAdvances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics
    LocationSan Diego, CA
    Country/TerritoryUnited States


    • Mathematical models
    • Measurement errors
    • Performance
    • Photons
    • Scattering
    • Space research
    • Telescopes
    • T


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