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Proceedings Paper

Performance of the Giant Magellan Telescope phasing system
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Paper Abstract

The 25.4m Giant Magellan Telescope consists of seven 8.4 m primary mirror (M1) segments with matching segmentation of the Gregorian secondary mirror (M2). When operating the telescope in the diffraction-limited Adaptive Optics (AO) observing modes, the M1-M2 pairs of segments must be phased to a small fraction of the observing wavelength. To achieve this level of correction, the phasing system uses multiple natural guidestar phasing sensors deployed across the field of view to provide an absolute phasing references to edge sensors bridging the gaps between segments. We will present in this paper the performance characterization of the GMT phasing system based on end-to-end numerical simulations performed with the Dynamic Optical Simulation (DOS) tool, which integrates the optical and mechanical dynamics models of the GMT with the Fourier optics models of AO and phasing sensors. The expected phasing performance under different observing conditions will be presented.

Paper Details

Date Published: 27 July 2016
PDF: 8 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99066D (27 July 2016); doi: 10.1117/12.2234260
Show Author Affiliations
Fernando Quirós-Pacheco, GMTO Corp. (United States)
Rodolphe Conan, GMTO Corp. (United States)
Antonin Bouchez, GMTO Corp. (United States)
Brian McLeod, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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