XSPECT telescopes on the SRG: optical performance
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.
- Publication:
-
Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics
- Pub Date:
- November 1994
- DOI:
- 10.1117/12.193167
- Bibcode:
- 1994SPIE.2279..526W