XSPECT telescopes on the SRG: optical performance

Niels J. Westergaard; Josef Polny; Finn Erland Christensen; Hans Ulrich Noergaard-Nielsen; Herbert W. Schnopper

doi:10.1117/12.193167

11 November 1994 XSPECT telescopes on the SRG: optical performance

Niels J. Westergaard, Josef Polny, Finn Erland Christensen, Hans Ulrich Noergaard-Nielsen, Herbert W. Schnopper

Proceedings Volume 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics; (1994) https://doi.org/10.1117/12.193167
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Niels J. Westergaard, Josef Polny, Finn Erland Christensen, Hans Ulrich Noergaard-Nielsen, and Herbert W. Schnopper "XSPECT telescopes on the SRG: optical performance", Proc. SPIE 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics, (11 November 1994); https://doi.org/10.1117/12.193167

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