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Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope
Author(s): Myung Cho; Youra Jun; Christoph Dribusch; Jieun Ryu; Gary Poczulp; Ming Liang; Sungho Lee; Jeong-Yeol Han; Ueejeong Jeong; Sanghyuk Kim; Bongkon Moon; Chang-Hee Kim; Yunjong Kim; Chan Park; Byeong-Gon Park; Il-Kwon Moon; Chan-Hee Lee; Wongi Lee; Ho-Sang Kim; Paul Gardner; Robert Bernier; Frank Groark; Hugo Chiquito
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Paper Abstract

The Fast-Steering Secondary Mirror (FSM) of Giant Magellan Telescope (GMT) consists of seven 1.1m diameter segments with effective diameter of 3.2m. Each segment is held by three axial supports and a central lateral support with a vacuum system for pressure compensation. Both on-axis and off-axis mirror segments are optimized under various design considerations. Each FSM segment contains a tip-tilt capability for guiding to attenuate telescope wind shake and mount control jitter. The design of the FSM mirror and support system configuration was optimized using finite element analyses and optical performance analyses. The design of the mirror cell assembly will be performed including sub-assembly parts consisting of axial supports, lateral support, breakaway mechanism, seismic restraints, and pressure seal. . In this paper, the mechanical results and optical performance results are addressed for the optimized FSM mirror and mirror cell assembly, the design considerations are addressed, and performance prediction results are discussed in detail with respect to the specifications

Paper Details

Date Published: 10 July 2018
PDF: 17 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070607 (10 July 2018); doi: 10.1117/12.2313375
Show Author Affiliations
Myung Cho, National Optical Astronomy Observatory (United States)
Youra Jun, The Univ. of Arizona (United States)
Christoph Dribusch, 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)
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)
Bongkon 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)
Il-Kwon Moon, Korea Research Institute of Standards and Science (Korea, Republic of)
Chan-Hee 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. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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