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Proceedings Paper

Development status of the prototype of the GMT fast steering mirror
Author(s): Young-Soo Kim; Ju Heon Koh; Inwoo Chung; Myung Cho; Ho-Soon Yang; Ho-Sang Kim; Hyo-Sung Ahn; Inwoo Han; Jaemann Kyeong; Moo-Young Chun; Byeong-Gon Park
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Paper Abstract

FSM is a secondary mirror of the Giant Magellan Telescope (GMT), which is 3.2 m in diameter. It consists of seven segments, each of which is 1m in diameter. The surrounding six segments are off-axis mirrors. FSM compensates image degradations caused by wind turbulence and structure jitter by using a tip-tilt mechanism. Korea Astronomy and Space Science Institute is developing a prototype of Fast Steering Mirror (FSM) together with four other institutions. The prototype is a full-size FSM segment, and it has two features; an off-axis mirror and a testbed for tip-tilt actuation. The off-axis mirror has the diameter of 1.06 m and fast focal ratio of 0.65. At present, lightweighting is successfully finished, and polishing of the front surface is proceeding. As for the tip-tilt, several test-beds have been assembled and the functions of tip-tilt have been checked. The third testbed is being integrated with a dummy aluminum mirror, three axial supports, a lateral support, and a test-bed frame. It is activated by a vacuum system. The test-bed will examine and verify the tip-tilt parameters. The FSM prototype is expected to be completed by 2012. In this paper, system engineering and progress of the prototype development are to be presented.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150B (15 October 2012); doi: 10.1117/12.2002577
Show Author Affiliations
Young-Soo Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Ju Heon Koh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Inwoo Chung, Korea Astronomy and Space Science Institute (Korea, Republic of)
Myung Cho, National Optical Astronomy Observatory (United States)
Ho-Soon Yang, Korea Research Institute of Standards and Science (Korea, Republic of)
Ho-Sang Kim, Institute for Advanced Engineering (Korea, Republic of)
Hyo-Sung Ahn, Gwangju Institute of Science and Technology (Korea, Republic of)
Inwoo Han, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jaemann Kyeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Byeong-Gon Park, Korea Astronomy and Space Science Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 8415:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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