A comparison of the mechanical design of fiber feeds for GRACES and GHOS

Anthony, André; Hill, Alexis; Pazder, John; Szeto, Kei; Halman, Mark; Tollestrup, E. V.; Barrick, Greg

doi:10.1117/12.927210

Cited by 5 publications

(3 citation statements)

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“…GRACES consists of three components: 1) an injection module sending the light from the Gemini telescope into the GRACES fibers, 2) two 270m-long GRACES fibers and 3) a receiver unit responsible for injecting the light from the fibers into the ESPaDOnS spectrograph at the Canada-France-Hawaii Telescope (CFHT). A complete description of the GRACES components was already presented in previous SPIE proceedings 3 . This section describes how the components performed during the acceptance test (achieved in the NRC-Herzberg optical lab from 3 to 7 Mar, 2014) and during the on-sky commissioning (in April-May, 2014).…”

Section: Graces Componentsmentioning

confidence: 99%

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GRACES: Gemini remote access to CFHT ESPaDOnS spectrograph through the longest astronomical fiber ever made: experimental phase completed

et al. 2014

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The Gemini Remote Access to CFHT ESPaDONS Spectrograph has achieved first light of its experimental phase in May 2014. It successfully collected light from the Gemini North telescope and sent it through two 270 m optical fibers to the the ESPaDOnS spectrograph at CFHT to deliver high-resolution spectroscopy across the optical region. The fibers gave an average focal ratio degradation of 14% on sky, and a maximum transmittance of 85% at 800nm. GRACES achieved delivering spectra with a resolution power of R = 40,000 and R = 66,000 between 400 and 1,000 nm. It has a ~8% throughput and is sensitive to target fainter than 21 st mag in 1 hour. The average acquisition time of a target is around 10 min. This project is a great example of a productive collaboration between two observatories on Maunakea that was successful due to the reciprocal involvement of the Gemini, CFHT, and NRC Herzberg teams, and all the staff involved closely or indirectly.

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Section: Graces Componentsmentioning

confidence: 99%

“…A complete description of the GRACES components was already presented in previous SPIE proceedings 3 . This section describes how the components performed during the acceptance test (achieved in the NRC-Herzberg optical lab from 3 to 7 Mar, 2014) and during the on-sky commissioning (in April-May, 2014).…”

Section: Graces Componentsmentioning

confidence: 99%

GRACES: Gemini remote access to CFHT ESPaDOnS spectrograph through the longest astronomical fiber ever made: experimental phase completed

et al. 2014

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“…Instrument's brief description GRACES consists of three components: 1) an injection module sending the light from the Gemini telescope into the GRACES fibers, 2) two 270m-long GRACES fibers and 3) a receiver unit responsible for injecting the light from the fibers into the ESPaDOnS spectrograph at the CFHT. A complete description of the GRACES components is presented by Anthony et al (2012). The receiver unit contains a bench holding the optics, an image slicer, a dekker blocking "unwanted" light from the slicer, a shutter and a pickoff mirror sending the light to the spectrograph.…”

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confidence: 99%

DRAGraces: A pipeline for the GRACES high-resolution spectrograph at Gemini

Chené,

Mao,

Lundquist

et al. 2020

Preprint

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This paper describes the software DRAGraces (Data Reduction and Analysis for GRACES), which is a pipeline reducing spectra from GRACES (Gemini Remote Access to the CFHT ESPaDOnS Spectrograph) at the Gemini North Telescope. The code is written in the IDL language. It is designed to find all the GRACES frames in a given directory, automatically determine the list of bias, flat, arc and science frames, and perform the whole reduction and extraction within a few minutes. We compare the output from DRAGraces with that of OPERA, a pipeline developed at CFHT that also can extract GRACES spectra. Both pipelines were developed completely independently, yet they give very similar extracted spectra. They both have their advantages and disadvantages . For instance, DRAGraces is more straightforward and easy to use and is less likely to be derailed by a parameter that needs to be tweaked, while OPERA offers a more careful extraction that can be significantly superior when the highest resolution is required and when the signal-to-noise ratio is low. One should compare both before deciding which one to use for their science. Yet, both pipelines deliver a fairly comparable resolution power (R ∼ 52.8k and 36.6k for DRAGraces and R ∼ 58k and 40k for OPERA in high and low-resolution spectral modes, respectively), wavelength solution and signal-to-noise ratio per resolution element.

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