9 August 2016 Opto-mechanical design of the G-CLEF flexure control camera system
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Abstract
The GMT-Consortium Large Earth Finder (G-CLEF) is the very first light instrument of the Giant Magellan Telescope (GMT). The G-CLEF is a fiber feed, optical band echelle spectrograph that is capable of extremely precise radial velocity measurement. KASI (Korea Astronomy and Space Science Institute) is responsible for Flexure Control Camera (FCC) included in the G-CLEF Front End Assembly (GCFEA). The FCC is a kind of guide camera, which monitors the field images focused on a fiber mirror to control the flexure and the focus errors within the GCFEA. The FCC consists of five optical components: a collimator including triple lenses for producing a pupil, neutral density filters allowing us to use much brighter star as a target or a guide, a tent prism as a focus analyzer for measuring the focus offset at the fiber mirror, a reimaging camera with three pair of lenses for focusing the beam on a CCD focal plane, and a CCD detector for capturing the image on the fiber mirror. In this article, we present the optical and mechanical FCC designs which have been modified after the PDR in April 2015.
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Jae Sok Oh, Chan Park, Jihun Kim, Kang-Min Kim, Moo-Young Chun, Young Sam Yu, Sungho Lee, Jakyoung Nah, Sung-Joon Park, Andrew Szentgyorgyi, Stuart McMuldroch, Timothy Norton, William Podgorski, Ian Evans, Mark Mueller, Alan Uomoto, Jeffrey Crane, Tyson Hare, "Opto-mechanical design of the G-CLEF flexure control camera system", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99089M (9 August 2016); doi: 10.1117/12.2232147; https://doi.org/10.1117/12.2232147
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