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24 September 2012 GRACES, the Gemini remote access CFHT ESPaDOnS spectrograph: initial design and testing
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric V. Tollestrup, John Pazder, Gregory Barrick, Eder Martioli, Ricardo Schiavon, André Anthony, Mark Halman, and Christian Veillet "GRACES, the Gemini remote access CFHT ESPaDOnS spectrograph: initial design and testing", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84462A (24 September 2012);


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