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Proceedings Paper

Thermal design features of the solar telescope GREGOR
Author(s): Peter Emde; Jurgen Kuhn; Ulrich Weis; Thomas Bornkessel
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Paper Abstract

The optical performance and pointing accuracy of the 1.5 m solar telescope GREGOR depend on the passive and active temperature control design features. Stringent thermal requirements are given in the technical specification for the passive thermal control of telescope structure and the main mirror air cooling system under operational conditions. The telescope structure has to be kept within a range of -0.5K through +0.2K against the ambient temperature. The main mirror temperature has to be kept up to a temperature difference of less than 2K under the ambient temperature with an accuracy of ±0.1K. The temperature difference across the main mirror surface has to be smaller than ±0.1K. Another thermal requirement asks for a main mirror safety cover to prevent the wandering of focused sunlight over the telescope structure in case of control system malfunction or power loss. Features of the chosen passive thermal concept for the telescope structure and the active main mirror air cooling system as well as the primary mirror safety cover system are presented together with the finite element analyses results and tests performed in order to find and verify the chosen design.

Paper Details

Date Published: 29 September 2004
PDF: 9 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.550492
Show Author Affiliations
Peter Emde, MAN Technologie AG (Germany)
Jurgen Kuhn, MAN Technologie AG (Germany)
Ulrich Weis, MAN Technologie AG (Germany)
Thomas Bornkessel, Technische Univ. Darmstadt (Germany)

Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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