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Proceedings Paper

WIRCam: the infrared wide-field camera for the Canada-France-Hawaii Telescope
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Paper Abstract

WIRCam (Wide-field InfraRed Camera) is a near-infrared (0.9-2.4 microns) camera developed for the prime focus of the Canada France Hawaii Telescope (CFHT), a 3.6-m telescope located on Mauna Kea, Hawaii. WIRCam is based on 4 x 2048x2048 HAWAII2RG arrays, developed by Rockwell. The camera provides a 0.3"/pixel sampling, and the close packaging of the detectors allows to cover an almost contiguous field-of-view of 20.5' x 20.5'. All optical elements are assembled in a cryovessel and cooled down to 85K by a He closed cycle cryogenerator. The two filter wheels have capacity for 8 filters (110 mm in diameter), cooled at low temperature together with the Lyot stop. These wheels are mounted on sapphire ball bearings and powered by external motors. Passive spring indexers define their positioning. A fused-silica tip/tilt plate powered by voice coil type motors provides image stabilization in front of the cryovessel. It compensates for flexures as well as for low frequency telescope oscillations from wind shake. This paper describes the overall architecture of the camera, giving the optical estimated performances and details some specific points of the design such as filter wheels, thermal connections, etc.

Paper Details

Date Published: 30 September 2004
PDF: 10 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.551097
Show Author Affiliations
Pascal Puget, Canada-France-Hawaii Telescope Corp. (United States)
Eric Stadler, Lab d'Astrophysique de Grenoble (France)
Rene Doyon, Univ. de Montreal (Canada)
Pierre Gigan, Observatoire de Paris-Meudon (France)
Simon Thibault, INO (Canada)
Gerard Luppino, GL Scientific (United States)
Gregory Barrick, Canada-France-Hawaii Telescope Corp. (United States)
Tom Benedict, Canada-France-Hawaii Telescope Corp. (United States)
Thierry Forveille, Canada-France-Hawaii Telescope Corp. (United States)
William Rambold, Canada-France-Hawaii Telescope Corp. (United States)
James Thomas, Canada-France-Hawaii Telescope Corp. (United States)
Tom Vermeulen, Canada-France-Hawaii Telescope Corp. (United States)
Jeff Ward, Canada-France-Hawaii Telescope Corp. (United States)
Jean-Luc Beuzit, Lab d'Astrophysique de Grenoble (France)
Philippe Feautrier, Lab d'Astrophysique de Grenoble (France)
Yves Magnard, Lab d'Astrophysique de Grenoble (France)
Guillaume Mella, Lab d'Astrophysique de Grenoble (France)
Olivier Preis, Lab d'Astrophysique de Grenoble (France)
Philippe Vallee, Univ. de Montreal (Canada)
Shiang-yu Wang, Institute for Astronomy and Astrophysics (Taiwan)
Chueh-Jen Lin, Institute for Astronomy and Astrophysics (Taiwan)
Donald N.B. Hall, Institute for Astronomy/Univ. of Hawaii (United States)
Klaus W. Hodapp, Institute for Astronomy/Univ. of Hawaii (United States)

Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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