Calibration and modelling of the SODART-OXS Bragg spectrometer onboard the SRG satellite

The SODART X-ray telescope includes an Objective Crystal Spectrometer (OXS) providing a high energy resolving power by Bragg reflection upon crystals. To cover a wide energy range, 3 types of natural crystals (LiF, Si, RAP) and a Co/C multilayer structure upon Si are used in the ranges 5-11 keV, 2-5 keV, 0.5-1.2 keV, and 0.16-0.42 keV. All types of crystals besides Si being an ideal crystal (with parameters which were calculated) have been calibrated individually and after gluing onto the Bragg panel. The X-ray calibration procedures and results are discussed below. A ray-tracing program using the OXS calibration data and simulating the X-ray photon reflection on the mentioned crystals and the multilayers has been developped and is described also. (orig.)Available from TIB Hannover: RR 7310(98-16) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman