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Final two-stage MOAO on-sky demonstration with CANARY

Eric Gendron,Tim Morris,A. G. Basden,Fabrice Vidal,David Atkinson,Urban Bitenc,T. Buey,Fanny Chemla,M. Cohen,Colin Dickson,N. A. Dipper,Philippe Feautrier,J.-L. Gach,Damien Gratadour,David H. Henry,Jean-Michel Huet,Carine Morel,Simon L. Morris,Richard M. Myers,James Osborn,Denis Perret,Andrew P. Reeves,Gerard Rousset,A. Sevin,Eric Stadler,Gordon Talbot,Stephen Todd,Edward J. Younger

ADAPTIVE OPTICS SYSTEMS V（2016）

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Abstract
CANARY is an on-sky Laser Guide Star (LGS) tomographic AO demonstrator in operation at the 4.2m William Herschel Telescope (WHT) in La Palma. From the early demonstration of open-loop tomography on a single deformable mirror using natural guide stars in 2010, CANARY has been progressively upgraded each year to reach its final goal in July 2015. It is now a two-stage system that mimics the future E-ELT: a GLAO-driven woofer based on 4 laser guide stars delivers a ground-layer compensated field to a figure sensor locked tweeter DM, that achieves the final on-axis tomographic compensation. We present the overall system, the control strategy and an overview of its on-sky performance.
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Key words
tomography,ELT,instrumentation,laser guide star,adaptive optics,wave-front sensing
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