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Proceedings Paper

Life with quintuplets: transitioning GeMS into regular operations
Author(s): Vincent Garrel; Marcos A. Van Dam; Benoît Neichel; Fabrice Vidal; Gaetano Sivo; Eduardo Marin; Vanessa Montes; Andrew Serio; Gustavo Arriagada; Chadwick Trujillo; William N. Rambold; Pedro Gigoux; Ramon Galvez; Cristian Moreno; Constanza Araujo Hauck; Tomislav Vucina Parga; Jeff Donahue; Claudio Marchant; Gaston Gausachs; Fabian Collao; Eleazar R. Carrasco Damele; Peter Pessev; Ariel Lopez
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Paper Abstract

The Gemini Multi-conjugate adaptive optics System (GeMS) at the Gemini South telescope in Cerro Pachon is the first sodium Laser Guide Star (LGS) adaptive optics (AO) system with multiple guide stars. It uses five LGSs and two deformable mirrors (DMs) to measure and compensate for distortions induced by atmospheric turbulence. After its 2012 commissioning phase, it is now transitioning into regular operations. Although GeMS has unique scientific capabilities, it remains a challenging instrument to maintain, operate and upgrade. In this paper, we summarize the latest news and results. First, we describe the engineering work done this past year, mostly during our last instrument shutdown in 2013 austral winter, covering many subsystems: an erroneous reconjugation of the Laser guide star wavefront sensor, the correction of focus field distortion for the natural guide star wavefront sensor and engineering changes dealing with our laser and its beam transfer optics. We also describe our revamped software, developed to integrate the instrument into the Gemini operational model, and the new optimization procedures aiming to reduce GeMS time overheads. Significant software improvements were achieved on the acquisition of natural guide stars by our natural guide star wavefront sensor, on the automation of tip-tilt and higher-order loop optimization, and on the tomographic non-common path aberration compensation. We then go through the current operational scheme and present the plan for the next years. We offered 38 nights in our last semester. We review the current system efficiency in term of raw performance, completed programs and time overheads. We also present our current efforts to merge GeMS into the Gemini base facility project, where night operations are all reliably driven from our La Serena headquarter, without the need for any spotter. Finally we present the plan for the future upgrades, mostly dedicated toward improving the performance and reliability of the system. Our first upgrade called NGS2, a project lead by the Australian National University, based a focal plane camera will replace the current low throughput natural guide wavefront sensor. On a longer term, we are also planning the (re-)integration of our third deformable mirror, lost during the early phase of commissioning. Early plans to improve the reliability of our laser will be presented.

Paper Details

Date Published: 7 August 2014
PDF: 14 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914829 (7 August 2014); doi: 10.1117/12.2056378
Show Author Affiliations
Vincent Garrel, Gemini Observatory (Chile)
Marcos A. Van Dam, Flat Wavefronts (New Zealand)
Benoît Neichel, Lab. d'Astrophysique de Marseille, CNRS, Aix Marseille Univ. (France)
Fabrice Vidal, LESIA, CNRS, Observatoire de Paris (France)
Gaetano Sivo, Gemini Observatory (Chile)
Eduardo Marin, Gemini Observatory (Chile)
Vanessa Montes, Gemini Observatory (Chile)
Andrew Serio, Gemini Observatory (Chile)
Gustavo Arriagada, Gemini Observatory (Chile)
Chadwick Trujillo, Gemini Observatory (United States)
William N. Rambold, Gemini Observatory (Chile)
Pedro Gigoux, Gemini Observatory (Chile)
Ramon Galvez, Gemini Observatory (Chile)
Cristian Moreno, Gemini Observatory (Chile)
Constanza Araujo Hauck, Gemini Observatory (Chile)
Tomislav Vucina Parga, Gemini Observatory (Chile)
Jeff Donahue, Gemini Observatory (United States)
Claudio Marchant, Gemini Observatory (Chile)
Gaston Gausachs, Gemini Observatory (Chile)
Fabian Collao, Gemini Observatory (Chile)
Eleazar R. Carrasco Damele, Gemini Observatory (Chile)
Peter Pessev, Gemini Observatory (Chile)
Ariel Lopez, Gemini Observatory (Chile)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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