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Proceedings Paper

A novel systems engineering approach to the design of a precision radial velocity spectrograph: the GMT-Consortium Large Earth Finder (G-CLEF)
Author(s): William Podgorski; Jacob Bean; Henry Bergner; Moo-Young Chun; Jeffrey Crane; Ian Evans; Janet Evans; Gabor Furesz; Dani Guzman; Kang-Min Kim; Kenneth McCracken; Mark Mueller; Timothy Norton; Chan Park; Sang Park; David Plummer; Andrew Szentgyorgyi; Alan Uomoto; In-Soo Yuk
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Paper Abstract

One of the first light instruments for the Giant Magellan Telescope (GMT) will be the GMT-Consortium Large Earth Finder (G-CLEF). It is an optical band echelle spectrograph that is fiber fed to enable high stability. One of the key capabilities of G-CLEF will be its extremely precise radial velocity (PRV) measurement capability. The RV precision goal is 10 cm/sec, which is expected to be achieved with advanced calibration methods and the use of the GMT adaptive optics system. G-CLEF, as part of the GMT suite of instruments, is being designed within GMT's automated requirements management system. This includes requirements flow down, traceability, error budgeting, and systems compliance. Error budgeting is being employed extensively to help manage G-CLEF technical requirements and ensure that the top level requirements are met efficiently. In this paper we discuss the G-CLEF error budgeting process, concentrating on the PRV precision and instrument throughput budgets. The PRV error budgeting process is covered in detail, as we are taking a detailed systems error budgeting approach to the PRV requirement. This has proven particularly challenging, as the precise measurement of radial velocity is a complex process, with error sources that are difficult to model and a complex calibration process that is integral to the RV measurement. The PRV budget combines traditional modeling and analysis techniques, where applicable, with semi-empirical techniques, as necessary. Extrapolation from existing PRV instruments is also used in the budgeting process.

Paper Details

Date Published: 28 July 2014
PDF: 17 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91478W (28 July 2014); doi: 10.1117/12.2056329
Show Author Affiliations
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jacob Bean, The Univ. of Chicago (United States)
Henry Bergner, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jeffrey Crane, Carnegie Observatories (United States)
Ian Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Janet Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Gabor Furesz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Dani Guzman, Pontificia Univ. Católica de Chile (Chile)
Kang-Min Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kenneth McCracken, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Mueller, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Timothy Norton, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sang Park, Harvard-Smithsonian Ctr. for Astrophysics (United States)
David Plummer, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Andrew Szentgyorgyi, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Alan Uomoto, Carnegie Observatories (United States)
In-Soo Yuk, Korea Astronomy and Space Science Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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