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Proceedings Paper

Optomechanical analysis and testing of a fast steering secondary mirror prototype for the Giant Magellan Telescope
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Paper Abstract

The Giant Magellan Telescope (GMT) will be one of the next class of extremely large segmented mirror telescopes. The GMT will utilize two Gregorian secondary mirrors, and Adaptive Secondary Mirror (ASM) and a Fast-steering Secondary Mirror (FSM). The FSM consists of six off-axis mirrors surrounding a central on-axis circular segment. The segments are 1.1 m in diameter and conjugated 1:1 to the seven 8.4 m segments of the primary. A prototype of the FSM mirror (FSMP) has been developed, analyzed and tested in order to demonstrate the mechanical and optical responses of the mirror assembly when subjected to structural and thermal loadings. In this paper, the mechanical and thermal performances of the FSMP were evaluated by performing finite element analyses (FEA) in NX Nastran. The deformation of the mirror’s lateral flexure was measured when the FSMP was axially loaded and the temperature response of the mirror assembly was measured when exposed to a sample thermal environment. In order to validate the mirror/lateral flexure design concept, the mechanical, optical and thermal measurements obtained from the tests conducted on mirrors having two different lateral flexures were compared to the responses calculated by FEA.

Paper Details

Date Published: 18 September 2013
PDF: 14 pages
Proc. SPIE 8836, Optomechanical Engineering 2013, 88360U (18 September 2013); doi: 10.1117/12.2024141
Show Author Affiliations
Andrew Corredor, The Univ. of Arizona (United States)
Won Hyun Park, College of Optical Sciences, The Univ. of Arizona (United States)
Myung Cho, National Optical Astronomy Observatory (United States)
Young-Soo Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)

Published in SPIE Proceedings Vol. 8836:
Optomechanical Engineering 2013
Alson E. Hatheway, Editor(s)

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