Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope

Myung Cho; Andrew Corredor; Christoph Dribusch; Won-Hyun Park; Michael Sheehan; Matt Johns; Stephen Shectman; Jonathan Kern; Charlie Hull; Young-Soo Kim; John Bagnasco

doi:10.1117/12.926374

17 September 2012 Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope

Myung Cho, Andrew Corredor, Christoph Dribusch, Won-Hyun Park, Michael Sheehan, Matt Johns, Stephen Shectman, Jonathan Kern, Charlie Hull, Young-Soo Kim, John Bagnasco

Author Affiliations +

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 844424 (2012) https://doi.org/10.1117/12.926374
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The Giant Magellan Telescope (GMT) Fast-steering secondary mirror (FSM) is one of the GMT two Gregorian secondary mirrors. The FSM is 3.2 m in diameter and built as seven 1.1 m diameter circular segments conjugated 1:1 to the seven 8.4m segments of the primary. A parametric study and optimization of the FSM mirror blank and central lateral flexure design were performed. For the optimized FSM configuration, the optical image qualities and structure functions for the axial and lateral gravity print-through cases, thermal gradient effects, and dynamic performances will be discussed. This paper reports performance predictions of the optimized FSM. To validate our lateral flexure design concept, mechanical and optical tests were conducted on test mirrors installed with two different lateral flexures.

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Myung Cho, Andrew Corredor, Christoph Dribusch, Won-Hyun Park, Michael Sheehan, Matt Johns, Stephen Shectman, Jonathan Kern, Charlie Hull, Young-Soo Kim, and John Bagnasco "Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844424 (17 September 2012); https://doi.org/10.1117/12.926374

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