24 September 2011 Design and development of a fast-steering secondary mirror for the Giant Magellan Telescope
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Abstract
The Giant Magellan Telescope (GMT) will be a 25m class telescope which is one of the extremely large telescope projects in the design and development phase. The GMT will have two Gregorian secondary mirrors, an adaptive secondary mirror (ASM) and a fast-steering secondary mirror (FSM). Both secondary mirrors are 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. The FSM has a tip-tilt feature to compensate image motions from the telescope structure jitters and the wind buffeting. The support system of the lightweight mirror consists of three axial actuators, one lateral support at the center, and a vacuum system. A parametric study and optimization of the FSM mirror blank and central lateral flexure design were performed. This paper reports the results of the trade study. 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 for the case of a lightweighted segment with a center thickness of 140 mm weighing approximately 105 kg.
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Myung Cho, Myung Cho, Andrew Corredor, Andrew Corredor, Christoph Dribusch, Christoph Dribusch, Kwijong Park, Kwijong Park, Young-Soo Kim, Young-Soo Kim, Il-Kweon Moon, Il-Kweon Moon, } "Design and development of a fast-steering secondary mirror for the Giant Magellan Telescope", Proc. SPIE 8125, Optomechanics 2011: Innovations and Solutions, 812505 (24 September 2011); doi: 10.1117/12.892411; https://doi.org/10.1117/12.892411
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