Development status of the prototype of the GMT fast steering mirror

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

doi:10.1117/12.2002577

15 October 2012 Development status of the prototype of the GMT fast steering mirror

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

Author Affiliations +

Proceedings Volume 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 84150B (2012) https://doi.org/10.1117/12.2002577
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

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.

Citation Download Citation

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, and Byeong-Gon Park "Development status of the prototype of the GMT fast steering mirror", Proc. SPIE 8415, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 84150B (15 October 2012); https://doi.org/10.1117/12.2002577

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