The eROSITA x-ray baffle

Peter Friedrich; C. Rohé; R. Gaida; J. Hartwig; F. Soller; H. Bräuninger; B. Budau; W. Burkert; V. Burwitz; J. Eder; G. Hartner; B. Menz; P. Predehl

doi:10.1117/12.2056335

25 July 2014 The eROSITA x-ray baffle

Peter Friedrich, C. Rohé, R. Gaida, J. Hartwig, F. Soller, H. Bräuninger, B. Budau, W. Burkert, V. Burwitz, J. Eder, G. Hartner, B. Menz, P. Predehl

Author Affiliations +

Proceedings Volume 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray; 91444R (2014) https://doi.org/10.1117/12.2056335
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

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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Peter Friedrich, C. Rohé, R. Gaida, J. Hartwig, F. Soller, H. Bräuninger, B. Budau, W. Burkert, V. Burwitz, J. Eder, G. Hartner, B. Menz, and P. Predehl "The eROSITA x-ray baffle", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91444R (25 July 2014); https://doi.org/10.1117/12.2056335

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