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Proceedings Paper

Thermal performance of the ATST secondary mirror
Author(s): Myung K. Cho; Joe DeVries; Eric Hansen
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Paper Abstract

The Advanced Technology Solar Telescope (ATST) has a 4.24m off-axis primary mirror designed to deliver diffractionlimited images of the sun. Its baseline secondary mirror (M2) design uses a 0.65m diameter Silicon Carbide mirror mounted kinematically by a bi-pod flexure mechanism at three equally spaced locations. Unlike other common telescopes, the ATST M2 is to be exposed to a significant solar heat loading. A thermal management system (TMS) will be developed to accommodate the solar loading and minimize "mirror seeing effect" by controlling the temperature difference between the M2 optical surface and the ambient air at the site. Thermo-elastic analyses for steady state thermal behaviors of the ATST secondary mirror was performed using finite element analysis by I-DEASTM and PCRINGETM for the optical analysis. We examined extensive heat transfer simulation cases and their results were discussed. The goal of this study is to establish thermal models by I-DEAS for an adequate thermal environment. These thermal models will be useful for estimating segment thermal responses. Current study assumes a few sample time dependent thermal loadings to synthesize the operational environment.

Paper Details

Date Published: 21 November 2007
PDF: 11 pages
Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 672102 (21 November 2007); doi: 10.1117/12.782674
Show Author Affiliations
Myung K. Cho, National Optical Astronomy Observatory (United States)
Joe DeVries, National Optical Astronomy Observatory (United States)
Eric Hansen, National Solar Observatory (United States)


Published in SPIE Proceedings Vol. 6721:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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