9 August 2016 The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)
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The 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 vacuum enclosed 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 3500Å to 9500Å. 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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Andrew Szentgyorgyi, Andrew Szentgyorgyi, Daniel Baldwin, Daniel Baldwin, Stuart Barnes, Stuart Barnes, Jacob Bean, Jacob Bean, Sagi Ben-Ami, Sagi Ben-Ami, Patricia Brennan, Patricia Brennan, Jamie Budynkiewicz, Jamie Budynkiewicz, Moo-Young Chun, Moo-Young Chun, Charlie Conroy, Charlie Conroy, Jeffrey D. Crane, Jeffrey D. Crane, Harland Epps, Harland Epps, Ian Evans, Ian Evans, Janet Evans, Janet Evans, Jeff Foster, Jeff Foster, Anna Frebel, Anna Frebel, Thomas Gauron, Thomas Gauron, Dani Guzmán, Dani Guzmán, Tyson Hare, Tyson Hare, Bi-Ho Jang, Bi-Ho Jang, Jeong-Gyun Jang, Jeong-Gyun Jang, Andres Jordan, Andres Jordan, Jihun Kim, Jihun Kim, Kang-Miin Kim, Kang-Miin Kim, Claudia Mendes Mendes de Oliveira, Claudia Mendes Mendes de Oliveira, Mercedes Lopez-Morales, Mercedes Lopez-Morales, Kenneth McCracken, Kenneth McCracken, Stuart McMuldroch, Stuart McMuldroch, Joseph Miller, Joseph Miller, Mark Mueller, Mark Mueller, Jae Sok Oh, Jae Sok Oh, Cem Onyuksel, Cem Onyuksel, Mark Ordway, Mark Ordway, Byeong-Gon Park, Byeong-Gon Park, Chan Park, Chan Park, Sung-Joon Park, Sung-Joon Park, Charles Paxson, Charles Paxson, David Phillips, David Phillips, David Plummer, David Plummer, William Podgorski, William Podgorski, Andreas Seifahrt, Andreas Seifahrt, Daniel Stark, Daniel Stark, Joao Steiner, Joao Steiner, Alan Uomoto, Alan Uomoto, Ronald Walsworth, Ronald Walsworth, Young-Sam Yu, 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 (9 August 2016); doi: 10.1117/12.2233506; https://doi.org/10.1117/12.2233506


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