The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)
Crane, Jeffrey D.
Mendes de Oliveira, Claudia Mendes
Oh, Jae Sok
AffiliationUniv Arizona, Steward Observ
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PublisherSPIE-INT SOC OPTICAL ENGINEERING
CitationAndrew Szentgyorgyi ; Daniel Baldwin ; Stuart Barnes ; Jacob Bean ; Sagi Ben-Ami ; Patricia Brennan ; Jamie Budynkiewicz ; Moo-Young Chun ; Charlie Conroy ; Jeffrey D. Crane ; Harland Epps ; Ian Evans ; Janet Evans ; Jeff Foster ; Anna Frebel ; Thomas Gauron ; Dani Guzmán ; Tyson Hare ; Bi-Ho Jang ; Jeong-Gyun Jang ; Andres Jordan ; Jihun Kim ; Kang-Miin Kim ; Claudia Mendes Mendes de Oliveira ; Mercedes Lopez-Morales ; Kenneth McCracken ; Stuart McMuldroch ; Joseph Miller ; Mark Mueller ; Jae Sok Oh ; Cem Onyuksel ; Mark Ordway ; Byeong-Gon Park ; Chan Park ; Sung-Joon Park ; Charles Paxson ; David Phillips ; David Plummer ; William Podgorski ; Andreas Seifahrt ; Daniel Stark ; Joao Steiner ; Alan Uomoto ; Ronald Walsworth and Young-Sam Yu " The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT) ", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990822 (August 9, 2016); doi:10.1117/12.2233506; http://dx.doi.org/10.1117/12.2233506
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AbstractThe GMT-Consortium Large Earth Finder (G-CLEF) will be a cross-dispersed, optical band echelle spectrograph to be delivered as the first light scientific instrument for the Giant Magellan Telescope (GMT) in 2022. G-CLEF is vacuumenclosed and fiber-fed to enable precision radial velocity (PRV) measurements, especially for the detection and characterization of low-mass exoplanets orbiting solar-type stars. The passband of G-CLEF is broad, extending from 3500 angstrom to . This passband provides good sensitivity at blue wavelengths for stellar abundance studies and deep red response for observations of high-redshift phenomena. The design of G-CLEF incorporates several novel technical innovations. We give an overview of the innovative features of the current design. G-CLEF will be the first PRV spectrograph to have a composite optical bench so as to exploit that material's extremely low coefficient of thermal expansion, high in-plane thermal conductivity and high stiffness-to-mass ratio. The spectrograph camera subsystem is divided into a red and a blue channel, split by a dichroic, so there are two independent refractive spectrograph cameras. The control system software is being developed in model-driven software context that has been adopted globally by the GMT. G-CLEF has been conceived and designed within a strict systems engineering framework. As a part of this process, we have developed a analytical toolset to assess the predicted performance of G-CLEF as it has evolved through design phases.
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