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

doi:10.1117/12.2233710

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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, 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, and 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); https://doi.org/10.1117/12.2233710

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