This paper describes the design of the objective Bragg spectrometer of the SODART telescope of the Spectrum-Röntgen-Gamma space observatory. A description is given of the structure of the spectrometer system that provides the functioning of the device and provides an accuracy of the steps by which the panel moves of about 10″. The results of tests of the given spectrometer are presented.
V. K. Sysoev, "Objective Bragg spectrometer of an x-ray telescope (design, subsystems, accuracy)," J. Opt. Technol. 73, 872-878 (2006)