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Proceedings Paper

GRACES, the Gemini remote access CFHT ESPaDOnS spectrograph: initial design and testing
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Paper Abstract

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.

Paper Details

Date Published: 24 September 2012
PDF: 10 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84462A (24 September 2012); doi: 10.1117/12.926626
Show Author Affiliations
Eric V. Tollestrup, Gemini Observatory (United States)
John Pazder, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Gregory Barrick, Canada-France-Hawaii Telescope (United States)
Eder Martioli, Canada-France-Hawaii Telescope (United States)
Ricardo Schiavon, Gemini Observatory (United States)
André Anthony, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Mark Halman, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Christian Veillet, Canada-France-Hawaii Telescope (United States)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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