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Proceedings Paper

The cooling concept of the x-ray telescope eROSITA
Author(s): Maria Fürmetz; Elmar Pfeffermann; Peter Predehl; Christian Rohé; Lars Tiedemann
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Paper Abstract

eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the core instrument of the Russian SRG satellite which will be launched in 2011 into an orbit of 600 km height and 30° inclination. It is being developed by the Max-Planck-Institute fur extraterrestrische Physik (MPE) in Garching, Germany. It comprises seven nested Wolter-I grazing incidence telescopes, each equipped with its own CCD camera. The seven eROSITA CCD cameras require a stable operating temperature of about (-80±0,5)°C. Therefore the thermal control system is vitally important. The cooling system consists of passive thermal control components only: two radiators, variable conductance heat pipes (VCHP) and two special thermal storage units. By reason of the low-earth-orbit and the special scan geometry it is impossible for one radiator to look into the cold space at all times. The cameras and the radiators are connected by variable conductance heat pipes which can be cut off when a radiator gets too warm. A novel "latent cold storage unit" guarantees an absolute constant temperature without any further control mechanism.

Paper Details

Date Published: 15 July 2008
PDF: 12 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113Y (15 July 2008); doi: 10.1117/12.789036
Show Author Affiliations
Maria Fürmetz, Max-Planck-Institut für extraterrestrische Physik (Germany)
Elmar Pfeffermann, Max-Planck-Institut für extraterrestrische Physik (Germany)
Peter Predehl, Max-Planck-Institut für extraterrestrische Physik (Germany)
Christian Rohé, Max-Planck-Institut für extraterrestrische Physik (Germany)
Lars Tiedemann, Max-Planck-Institut für extraterrestrische Physik (Germany)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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