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Proceedings Paper

Performance and control of the MMT thermal system
Author(s): George G. Williams; J. Duane Gibson; Shawn Callahan; Dan Blanco; J. T. Williams; Peter Spencer
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Paper Abstract

We present results from a study of the performance of the MMT thermal system. The 6.5-m MMT primary mirror consists of a borosilicate honeycomb structure that is thermally controlled with a forced-air ventilation system. We will give an overview of both the measurement and control systems. Our goal is to define an algorithm for control of the ventilation system such that the primary mirror temperature closely tracks ambient while minimizing thermal gradients. Future work will include a study of correlations between the thermal state of the primary mirror and both seeing and wavefront errors. The thermal system is currently controlled by the telescope operators, but the results from this work will assist in fully automating the system.

Paper Details

Date Published: 28 September 2004
PDF: 12 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.552090
Show Author Affiliations
George G. Williams, MMT Observatory, Smithsonian Institution and Univ. of Arizona (United States)
J. Duane Gibson, MMT Observatory, Smithsonian Institution and Univ. of Arizona (United States)
Shawn Callahan, Large Binocular Telescope Observatory (United States)
Dan Blanco, MMT Observatory, Smithsonian Institution and Univ. of Arizona (United States)
J. T. Williams, MMT Observatory, Smithsonian Institution and Univ. of Arizona (United States)
Large Binocular Telescope Observatory (United States)
Peter Spencer, MMT Observatory, Smithsonian Institution and Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann, Editor(s)

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