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27 July 2016 Performance of the Giant Magellan Telescope phasing system
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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.
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Fernando Quirós-Pacheco, Rodolphe Conan, Antonin Bouchez, and Brian McLeod "Performance of the Giant Magellan Telescope phasing system", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99066D (27 July 2016);

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