GRACES, the gemini remote access CFHT ESPaDOnS spectrograph; initial design and testing

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DOIResolve DOI: http://doi.org/10.1117/12.926626
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TypeArticle
Proceedings titleProceedings of SPIE - The International Society for Optical Engineering
ConferenceGround-Based and Airborne Instrumentation for Astronomy IV, 1 July 2012 through 6 July 2012, Amsterdam
ISSN0277-786X
ISBN9780819491473
Volume8446
Article number84462A
SubjectFocal ratio degradation; High resolution; Initial design; Keck observatory; Laboratory test; Long fiber; Optical spectrograph; Remote access; Transmission loss; Astronomy; Optical fibers; Optical telescopes; Telescopes; Spectrographs
AbstractThe 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 SPIE.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269204
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Record identifier311509c3-defe-4ec6-a038-68bfce8c571b
Record created2013-12-12
Record modified2016-05-09
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