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Development status of the fast-steering secondary mirror of GMT
Author(s): Sungho Lee; Jeong-Yeol Han; Ueejeong Jeong; Sanghyuk Kim; Bong-Kon Moon; Chang-Hee Kim; Yunjong Kim; Chan Park; Byeong-Gon Park; Myung K. Cho; Christoph Dribusch; Youra Jun; Jieun Ryu; Gary Poczulp; Ming Liang; Il Kweon Moon; Chanhee Lee; Wongi Lee; Ho-Sang Kim; Paul Gardner; Robert Bernier; Frank Groark; Hugo Chiquito
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Paper Abstract

The Giant Magellan Telescope (GMT) will be equipped with two Gregorian secondary mirrors; a fast-steering secondary mirror (FSM) for seeing-limited operations and an adaptive secondary mirror (ASM) for adaptive optics observing modes. The FSM has an effective diameter of 3.2 m and is comprised of seven 1.1 m diameter circular segments, which are conjugated 1:1 to the seven 8.4m segments of the primary mirror. Each FSM segment has a tip-tilt capability for fast guiding to attenuate telescope wind shake and jitter. The FSM is mounted on a two-stage positioning system; a macro-cell that positions the entire FSM segments as an assembly and seven hexapod actuators that position and drive the individual FSM segments. In this paper, we present a technical overview of the FSM development status. More details in each area of development will be presented in other papers by the FSM team.

Paper Details

Date Published: 6 July 2018
PDF: 16 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070044 (6 July 2018); doi: 10.1117/12.2313174
Show Author Affiliations
Sungho Lee, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jeong-Yeol Han, Korea Astronomy and Space Science Institute (Korea, Republic of)
Ueejeong Jeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sanghyuk Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Bong-Kon Moon, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chang-Hee Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Yunjong Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Byeong-Gon Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Myung K. Cho, National Optical Astronomy Observatory (United States)
Christoph Dribusch, The Univ. of Arizona (United States)
Youra Jun, The Univ. of Arizona (United States)
Jieun Ryu, The Univ. of Arizona (United States)
Gary Poczulp, National Optical Astronomy Observatory (United States)
Ming Liang, National Optical Astronomy Observatory (United States)
Il Kweon Moon, Korea Research Institute of Standards and Science (Korea, Republic of)
Chanhee Lee, Institute for Advanced Engineering (Korea, Republic of)
Wongi Lee, Institute for Advanced Engineering (Korea, Republic of)
Ho-Sang Kim, Institute for Advanced Engineering (Korea, Republic of)
Paul Gardner, GMTO Corp. (United States)
Robert Bernier, GMTO Corp. (United States)
Frank Groark, GMTO Corp. (United States)
Hugo Chiquito, GMTO Corp. (United States)


Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio; Roberto Gilmozzi, Editor(s)

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