The Opto-Mechanical Design of the GMT-Consortium Large Earth Finder (G-CLEF) Spectrograph Adapted for the Magellan Telescope

Mueller, Mark; Szentgyorgyi, Andrew; McMuldroch, Stuart; Ben-Ami, Sagi; Kim, Kang-Min; Park, Chan; Baldwin, Daniel; Catropa, Daniel; Chun, Moo-Yung; Crane, Jeffrey D.; Durusky, Daniel; Eastman, Jason; Epps, Harland; Evans, Ian N.; Gauron, Thomas; Hershko, Ofir; Jurgenson, Colby; McCracken, Kenneth; Onyuksel, Cem; Podgorski, William; Smith, Matthew; Uomoto, Alan; Evans, CJ; Bryant, JJ; Motohara, K
2022
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX
DOI
10.1117/12.2630238
The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber-fed, optical echelle spectrograph that will be a first light instrument for the Giant Magellan Telescope (GMT). G-CLEF is a general-purpose echelle spectrograph with precision radial velocity (PRV) capability. The radial velocity (RV) precision goal of G-CLEF is 10 cm/sec; necessary for detection of Earth-sized exoplanets orbiting Solar-type stars in their habitable zone. This imposes challenging stability requirements on the optical mounts and spectrograph support structures especially when considering the instrument's operational environment. G-CLEF's accuracy will be influenced by thermal effects, ambient air pressure, vibration, and micro gravity-vector variations caused by normal telescope slewing.