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22 July 2016 Development of the fast steering secondary mirror assembly of GMT
Sungho Lee, Myung K. Cho, Chan Park, Jeong-Yeol Han, Ueejeong Jeong, Yang-noh Yoon, Je Heon Song, Byeong-Gon Park, Christoph Dribusch, Won Hyun Park, Youra Jun, Ho-Soon Yang, Il-Kwon Moon, Chang Jin Oh, Ho-Sang Kim, Kyoung-Don Lee, Robert Bernier, Chris Alongi, Andrew Rakich, Paul Gardner, Lee Dettmann, Wylie Rosenthal
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Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991241 (2016) https://doi.org/10.1117/12.2233710
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom
Abstract
The Giant Magellan Telescope (GMT) will be featured with two Gregorian secondary mirrors, an adaptive secondary mirror (ASM) and a fast-steering secondary mirror (FSM). The FSM has an effective diameter of 3.2 m and built as seven 1.1 m diameter circular segments, which are conjugated 1:1 to the seven 8.4m segments of the primary. Each FSM segment contains a tip-tilt capability for fine co-alignment of the telescope sub-apertures and fast guiding to attenuate telescope wind shake and mount control jitter. This tip-tilt capability thus enhances performance of the telescope in the seeing limited observation mode. As the first stage of the FSM development, Phase 0 study was conducted to develop a program plan detailing the design and manufacturing process for the seven FSM segments. The FSM development plan has been matured through an internal review by the GMTO-KASI team in May 2016 and fully assessed by an external review in June 2016. In this paper, we present the technical aspects of the FSM development plan.
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Sungho Lee, Sungho Lee, Myung K. Cho, Myung K. Cho, Chan Park, Chan Park, Jeong-Yeol Han, Jeong-Yeol Han, Ueejeong Jeong, Ueejeong Jeong, Yang-noh Yoon, Yang-noh Yoon, Je Heon Song, Je Heon Song, Byeong-Gon Park, Byeong-Gon Park, Christoph Dribusch, Christoph Dribusch, Won Hyun Park, Won Hyun Park, Youra Jun, Youra Jun, Ho-Soon Yang, Ho-Soon Yang, Il-Kwon Moon, Il-Kwon Moon, Chang Jin Oh, Chang Jin Oh, Ho-Sang Kim, Ho-Sang Kim, Kyoung-Don Lee, Kyoung-Don Lee, Robert Bernier, Robert Bernier, Chris Alongi, Chris Alongi, Andrew Rakich, Andrew Rakich, Paul Gardner, Paul Gardner, Lee Dettmann, Lee Dettmann, Wylie Rosenthal, Wylie Rosenthal, } "Development of the fast steering secondary mirror assembly of GMT", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991241 (22 July 2016); doi: 10.1117/12.2233710; https://doi.org/10.1117/12.2233710
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