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Proceedings Paper

Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope
Author(s): Myung Cho; Andrew Corredor; Christoph Dribusch; Won-Hyun Park; Michael Sheehan; Matt Johns; Stephen Shectman; Jonathan Kern; Charlie Hull; Young-Soo Kim; John Bagnasco
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Paper Abstract

The Giant Magellan Telescope (GMT) Fast-steering secondary mirror (FSM) is one of the GMT two Gregorian secondary mirrors. The FSM is 3.2 m in diameter and built as seven 1.1 m diameter circular segments conjugated 1:1 to the seven 8.4m segments of the primary. A parametric study and optimization of the FSM mirror blank and central lateral flexure design were performed. For the optimized FSM configuration, the optical image qualities and structure functions for the axial and lateral gravity print-through cases, thermal gradient effects, and dynamic performances will be discussed. This paper reports performance predictions of the optimized FSM. To validate our lateral flexure design concept, mechanical and optical tests were conducted on test mirrors installed with two different lateral flexures.

Paper Details

Date Published: 17 September 2012
PDF: 13 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844424 (17 September 2012); doi: 10.1117/12.926374
Show Author Affiliations
Myung Cho, National Optical Astronomy Observatory (United States)
Andrew Corredor, The Univ. of Arizona (United States)
Christoph Dribusch, The Univ. of Arizona (United States)
Won-Hyun Park, College of Optical Sciences, The Univ. of Arizona (United States)
Michael Sheehan, Giant Magellan Telescope Project (United States)
Matt Johns, Giant Magellan Telescope Project (United States)
Stephen Shectman, Giant Magellan Telescope Project (United States)
Jonathan Kern, Giant Magellan Telescope Project (United States)
Charlie Hull, Giant Magellan Telescope Project (United States)
Young-Soo Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
John Bagnasco, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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