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Publication
Featured researches published by Christian Veillet.
Proceedings of SPIE | 2008
Olivier Lai; Christian Veillet; Derrick Salmon; Kevin Ho; Marc Baril; Gregory Barrick; James D. Thomas; Douglas Teeple; Tom Benedict; Jean Paul Pique; Hugues Guillet de Chatellus
VASAO is an ambitious project that explores new conceptual direction in the field of astronomical adaptive optics. In the era of 8 meter and larger telescopes, and their instrument costs and telescope time pressure, there is a natural niche for such ground-breaking conceptual development in the 4 meter class telescope. The aim of VASAO is to provide diffraction limited imaging in the visible with 100% sky coverage; the challenge (but potential rewards) arises from the simultaneity of these requirements. To this end, CFHT is conducting a feasibility study based on the polychromatic guide star concept (Foy et al., 1995 [4]) coupled with a high order curvature AO system, presented in this paper. A number of experiments have been started (or carried out) to study the challenges and limits of the techniques involved in an operational setting; these include the FlyEyes detector, and a polychromatic tip-tilt test on natural stars. Because such a project straddles such a fine line between facility instrument and experimental facility, careful thought has to be given to the balance between modes of operations and potential astrophysical targets.
Proceedings of SPIE | 2012
Eric V. Tollestrup; John Pazder; Gregory Barrick; Eder Martioli; Ricardo P. Schiavon; Andre Anthony; Mark Halman; Christian Veillet
The Gemini Remote Access CFHT ESPaDOnS Spectrograph (GRACES) is an innovative instrumentation experiment that will demonstrate if ESPaDOnS, a bench-mounted high-resolution optical spectrograph at CFHT, can be fed by a 270-m long fiber from the Gemini-North telescope with low enough losses to remain competitive with conventional spectrographs on other 8 to 10-m telescopes. Detailed simulations have shown that GRACES should be more sensitive than the HIRES spectrograph at Keck Observatory at wavelengths longer than about 600-700 nm. This result is possible by using FPB-type of optical fibers made by Polymicro Technologies and by keeping the critical focal ratio degradation (FRD) losses to less than 10%. Laboratory tests on these FPB optical fibers are underway and show that for 36-m lengths that the FRD losses are as low as 0.8% with a repeatability of 1%. Tests are currently underway on 280-m lengths.
Proceedings of SPIE | 2012
William A. Mahoney; Christian Veillet; Karun Thanjavur
A prototype genetic algorithm (GA) is being developed to provide assisted and ultimately automated observation scheduling functionality. Harnessing the logic developed for manual queue preparation, the GA can build suitable sets of queues for the potential combinations of environmental and atmospheric conditions. Evolving one step further, the GA can select the most suitable observation for any moment in time, based on allocated priorities, agency balances, and realtime availability of the skies condition.
Proceedings of SPIE | 2006
Christian Veillet; Olivier Lai; Derrick Salmon; Jean-Paul Pique
Building on an extensive and successful experience in Adaptive Optics (AO) and on recent developments made in its funding nations, the Canada-France-Hawaii-Telescope Corporation (CFHT) is studying the VASAO concept: an integrated AO system that would allow diffraction limited imaging of the whole sky in the visible as well as in the infrared. At the core of VASAO, Pueo-Hou (the new Pueo) is built on Pueo, the current CFHT AO bonnette. Pueo will be refurbished and improved to be able to image the isoplanetic field at 700 nm with Strehl ratios of 30% or better, making possible imaging with a resolution of 50 milliarcseconds between 500 and 700nm, and at the telescope limit of diffraction above. The polychromatic tip-tilt laser guide star currently envisioned will be generated by a single 330nm mode-less laser, and the relative position of the 330nm and 589nm artificial stars created on the mesosphere by the 330nm excitation of the sodium layer will be monitored to provide the atmospheric tip-tilt along the line of sight, following the philosophy developed for the ELP-OA project. The feasibility study of VASAO will take most of 2006 in parallel with the development of a science case making the best possible use of the unique capabilities of the system, If the feasibility study is encouraging, VASAO development could start in 2007 for a full deployment on the sky by 2011-2012.
Proceedings of SPIE | 2012
Kei Szeto; Mathieu Angers; Craig Breckenridge; Steven E. Bauman; Nathan Loewen; David Loop; Alan W. McConnachie; Jonh Pazder; Derrick Salmon; Paolo Spano; Siegfried F. Stiemer; Christian Veillet
The Next Generation Canada-France-Hawaii Telescope is a dedicated, 10m aperture, wide-field, fiber-fed multiobject spectroscopic facility proposed as an upgrade to the existing Canada-France-Hawaii Telescope on the summit of Mauna Kea. The Next Generation Canada-France-Hawaii Telescope baseline concept assumes the new facility is built on the existing Canada-France-Hawaii Telescope telescope pier and enclosure pier and occupies the same three dimensional exterior “footprint”. Three technical studies have been planned to examine the validity of these assumptions. The technical studies are executed in series as they represent technical decision points in a logical sequence. The three technical studies in succession are: 1. Telescope Pier Study – Load Capacity and Structural Interface, 2. Enclosure Fixed Base Study – Telescope and Enclosure Configuration and Load Capacity and 3. Aero- Thermal Study – Dome Thermal Seeing and Air Flow Attenuation over the Enclosure Aperture Opening. The paper outlines the baseline facility (telescope, spectrograph and enclosure) concept and the status of these studies, and discusses the proposed telescope and enclosure configuration in terms of the redevelopment assumptions. A consolidated feasibility study report will be submitted to the CFHT Board and Science Advisory Committee in the Fall of 2012, with first light for the facility aiming to be in the early 2020s.
Archive | 2000
Nadine Manset; Christian Veillet; Dennis R. Crabtree
Archive | 2007
F. Malacrino; Christian Veillet; J.-L. Atteia; Michel Boer; J.-C. Cuillandre; Alain Klotz; K. C. Withington
Archive | 2005
F. Malacrino; J.-L. Atteia; Michel Boer; Alain Klotz; Christian Veillet; J.-C. Cuillandre; J. J. Kaavelars
Archive | 2004
G. Stratta; F. Malacrino; M. Boer; Alain Klotz; J.-L. Atteia; Paul Martin; Christian Veillet; J.-C. Cuillandre; L. Wells
Archive | 2001
Catherine Dougados; Francois Menard; Eugene Allen Magnier; J.-C. Cuillandre; Olivier Lai; Nadine Manset; Gregory G. Fahlman; Martin; J. Bouvier; Christian Veillet; Paul Martin; Thierry Forveille