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13 September 2012 Increasing sky coverage with the Gemini North ALTAIR/LGS AO system
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The Gemini North (GN) AO system, Altair, has been routinely operating in LGS mode since 2007. Due to the initial optical design, the NGS field-of-view (FoV) is limited to a radius ~ 25" which limits the potential science. To improve this, we have tested the AO/LGS operation using a peripheral wavefront sensor (PWFS) whose patrol field is ~ 4'-7' from the target. This expanded NGS FoV permits greater sky coverage but with decreased resolution, FWHM ~ 0.1" - 0.2" making this mode very suitable for non-imaging spectrographic and integral field unit observations. We present the hardware and software upgrades to PWFS and Altair as well as the software necessary for making this observing mode a routine and integral part of GN operations. Characterization and performance of this new operation mode, known as LGS+P1, are presented.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Julian C. Christou, Maxime Boccas, Angelic Ebbers, Richard M. McDermid, Richard Oram, Chadwick Trujillo, and Brian Walls "Increasing sky coverage with the Gemini North ALTAIR/LGS AO system", Proc. SPIE 8447, Adaptive Optics Systems III, 84473E (13 September 2012);


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