Response function of the SODART-OXS Bragg spectrometer on board the SRG satellite

Hans-Joachim Wiebicke; Ingolf Halm; Finn Erland Christensen; Niels J. Westergaard; Salim Abdali

doi:10.1117/12.278860

11 July 1997 Response function of the SODART-OXS Bragg spectrometer on board the SRG satellite

Hans-Joachim Wiebicke, Ingolf Halm, Finn Erland Christensen, Niels J. Westergaard, Salim Abdali

Proceedings Volume 3113, Grazing Incidence and Multilayer X-Ray Optical Systems; (1997) https://doi.org/10.1117/12.278860
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The SODART x-ray telescope includes an objective crystal spectrometer (OXS) providing an energy resolving power around 1000 by Bragg reflection upon crystals. A program to calculate the SODART-OXS response function is described. It includes the simulation of the arrangement of the LiF, Si, and RAP crystals on the Bragg panel, the angle-dependent projection of the infalling x rays onto the mirrors, and the partial shadowing of the panel by the entrance door. The response function depends also on the parameters of the crystals (reflectivity and rocking curve width), using calculated and measured values in their energy dependence. The effective area of the mirror shells and the detector efficiencies are included, too. The energy dependences of the individual factors are shown and used to define an optimal crystal layout taking simulated and measured x-ray source lines (within the XANADU package) to find the most important Bragg-angle regions. It turns out that the optimal Si-RAP crystal distribution on the panel is asymmetric, thus favoring high-energy Si and low-energy RAP line regions. The response functions are displayed and used for the calculation of count rates for line and continuum registration.

Citation Download Citation

Hans-Joachim Wiebicke, Ingolf Halm, Finn Erland Christensen, Niels J. Westergaard, and Salim Abdali "Response function of the SODART-OXS Bragg spectrometer on board the SRG satellite", Proc. SPIE 3113, Grazing Incidence and Multilayer X-Ray Optical Systems, (11 July 1997); https://doi.org/10.1117/12.278860

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