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Detailed design of the G-CLEF flexure control camera subsystem
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Paper Abstract

The GMT-Consortium Large Earth Finder (G-CLEF) is one of the first instrument for the Giant Magellan Telescope (GMT). The G-CLEF is a fiber fed, optical band echelle spectrograph that is capable of extremely precise radial velocity measurement. The G-CLEF Flexure Control Camera (FCC) is included as a part in the G-CLEF Front End Assembly (GCFEA), which monitors the field images focused on a fiber mirror to control the flexure and the focus errors within the GCFEA. The five optical components constituting the FCC are aligned on a common optical bench. The order of the optical train is: a collimator, neutral density filters, a focus analyzer, a reimaging camera barrel, and a detector module. The collimator receives the beam reflected by the fiber mirror and consists of a triplet lens. The neutral density filters are located just after the collimator to make it possible a broad range star brightness as a target or a guide. The tent prism focus analyzer is positioned at a pupil produced by the collimator and is used to measure a focus offset. The reimaging camera barrel includes two pairs of doublet lenses to focus the beam onto the CCD focal plane. The detector module is composed of a linear translator and a field de-rotator. In this article, we present the optical and mechanical detailed designs of the G-CLEF FCC.

Paper Details

Date Published: 11 July 2018
PDF: 11 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107028X (11 July 2018); doi: 10.1117/12.2311908
Show Author Affiliations
Jae Sok Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kang-Min Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Young Sam Yu, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sungho Lee, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jihun Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Ueejeong Jeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chang-Hee Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Andrew Szentgyorgyi, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stuart McMuldroch, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ian Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Mueller, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Alan Uomoto, Carnegie Observatories (United States)
Jeffrey Crane, Carnegie Observatories (United States)
Tyson Hare, Carnegie Observatories (United States)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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