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Tim Morris |
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Multiple Object Adaptive Optics (MOAO) is a technique that allows adaptive optics correction to be extended over much larger fields of view than other AO techniques, and is particularly suited to surveys of sparsely populated objects. MOAO relies on tomographic mapping of the volume of turbulence above a telescope using multiple reference sources, and then the open-loop AO correction of this turbulence along discrete lines of sight. CANARY is an on-sky MOAO demonstrator that underwent initial commissioning on the 4.2m William Herschel Telescope in La Palma at the end of 2010. For this initial phase of CANARY, three off-axis natural guide star Wavefront Sensors (WFSs) were used to perform tomography with an on-axis deformable mirror providing correction along a single line of sight only. I will briefly describe the design of the CANARY open-loop AO system and then discuss some of the issues involved with its calibration and alignment. I will finally present some initial results of the on-sky AO performance of CANARY, followed by what the future plans for the CANARY instrument are. |