eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the
core instrument on the Russian Spektrum-Roentgen-Gamma (SRG) mission which is
scheduled for launch in late 2012. eROSITA is fully approved and funded by the
German Space Agency DLR and the Max-Planck-Society.The design driving science
is the detection of 50-100 thousands Clusters of Galaxies up to redshift z~1.3
in order to study the large scale structure in the Universe and test
cosmological models, especially Dark Energy. This will be accomplished by an
all-sky survey lasting for four years plus a phase of pointed observations.
eROSITA consists of seven Wolter-I telescope modules, each equipped with 54
Wolter-I shells having an outer diameter of 360 mm. This would provide and
effective area at 1.5 keV of ~1500 cm2 and an on axis PSF HEW of 15" which
would provide an effective angular resolution of 25"-30". In the focus of each
mirror module, a fast frame-store pn-CCD will provide a field of view of 1deg
in diameter for an active FOV of ~0.83 deg2. At the time of writing the
instrument development is currently in phase C/D.Comment: 6 Pages, 3 Figure, Proceedings of the conference "X-ray Astronomy
2009", Bologna, September 200
The X-ray baffle is an important part of the eROSITA mirror assembly as it reduces the stray light caused by single reflections at the Wolter 1 Mirrors by more than 90%. The stray light problem and possible solutions were analyzed by ray-tracing resulting in a trade-off between effective stray light protection and avoidance of vignetting. Possible design alternatives were considered and the influences of manufacturing tolerances were studied. Other than for XMM, the eROSITA X-ray baffle could not be realized as sieve plates; instead a system of co-aligned "baffle rings" was mounted onto each of the mirror modules. The mechanical design is based on concentric Invar foils fixed by an own spider. The complete X-ray baffles were finally mounted to the mirror module while the alignment was controlled by optical means.
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