17 September 2012 Development and testing of the eROSITA mirror modules
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Abstract

MPE will provide the X-ray Survey Telescope eROSITA for the Russian Spektrum-Roentgen-Gamma Mission. The mirror system consists of a compact bundle of seven co-aligned mirror modules with a focal length of 1600 mm and 54 nested mirror shells each. The 61 arcmin field-of-view (FoV) will yield a high grasp of about 1000 cm2deg2 around 1 keV. An angular resolution of 15 arcsec HEW on-axis (resulting in an average angular resolution of ~26 arcsec HEW over the field-of-view and ~30 arcsec including all optical and spacecraft error contributions) will help distinguish point sources from extended emission of galaxy clusters which are relevant for cosmological studies. During a four year allsky survey eROSITA will generate a new rich database of X-ray sources. In a second phase of the mission eROSITA will also perform pointed observations.

After a mirror development program the integration of flight mirror modules started in early 2011. Currently, the manufacturing of flight modules is ongoing and some of the partially integrated ones have already been X-ray tested. Calibration of completed mirror modules will start end of 2012. Parallel to the X-ray mirrors we have developed an X-ray baffle to suppress stray light from single reflections. It consists of precisely shaped and welded concentric Invar foils which will be mounted on top of each mirror module and aligned by optical means.

We report on the design and the mirror development program including the X-ray baffle and present the latest results from X-ray measurements.

© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Friedrich, Heinrich Bräuninger, Bernd Budau, Wolfgang Burkert, Vadim Burwitz, Konrad Dennerl, Josef Eder, Michael Freyberg, Roland Gaida, Gisela Hartner, Benedikt Menz, Elmar Pfeffermann, Peter Predehl, Christian Rohé, Reiner Schreib, "Development and testing of the eROSITA mirror modules", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84431S (17 September 2012); doi: 10.1117/12.926772; https://doi.org/10.1117/12.926772
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