The GMT-CfA, Carnegie, Catolica, Chicago Large Earth Finder (G-CLEF): A general purpose optical echelle spectrograph for the GMT with precision radial velocity capability

A. Szentgyorgyi, A. Frebel, G. Furész, E. Hertz, T. Norton, J. Bean, H. Bergner, J. Crane, J. Evans, I. Evans, T. Gauron, A. Jordán, S. Park, A. Uomoto, S. Barnes, W. Davis, M. Eisenhower, H. Epps, D. Guzman, K. McCrackenM. Ordway, D. Plummer, W. Podgorski, D. Weaver

Producción científica: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

35 Citas (Scopus)

Resumen

The GMT-CfA, Carnegie, Catolica, Chicago Large Earth Finder (G-CLEF) is a fiber fed, optical echelle spectrograph that has undergone conceptual design for consideration as a first light instrument at the Giant Magellan Telescope. G-CLEF has been designed to be a general-purpose echelle spectrograph with precision radial velocity (PRV) capability. We have defined the performance envelope of G-CLEF to address several of the highest science priorities in the Decadal Survey1. The spectrograph optical design is an asymmetric, two-arm, white pupil design. The asymmetric white pupil design is adopted to minimize the size of the refractive camera lenses. The spectrograph beam is nominally 300 mm, reduced to 200 mm after dispersion by the R4 echelle grating. The peak efficiency of the spectrograph is >35% and the passband is 3500-9500Å. The spectrograph is primarily fed with three sets of fibers to enable three observing modes: High-Throughput, Precision-Abundance and PRV. The respective resolving powers of these modes are R∼ 25,000, 40,000 and 120,000. We also anticipate having an R∼40,000 Multi-object Spectroscopy mode with a multiplex of ∼40 fibers. In PRV mode, each of the seven 8.4m GMT primary mirror sub-apertures feeds an individual fiber, which is scrambled after pupil-slicing. The goal radial velocity precision of G-CLEF is ∂V <10 cm/sec radial. In this paper, we provide a flowdown from fiducial science programs to design parameters. We discuss the optomechanical, electrical, structural and thermal design and present a roadmap to first light at the GMT.

Idioma originalInglés
Título de la publicación alojadaGround-Based and Airborne Instrumentation for Astronomy IV
DOI
EstadoPublicada - 2012
Publicado de forma externa
EventoGround-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Países Bajos
Duración: 1 jul. 20126 jul. 2012

Serie de la publicación

NombreProceedings of SPIE - The International Society for Optical Engineering
Volumen8446
ISSN (versión impresa)0277-786X

Conferencia

ConferenciaGround-Based and Airborne Instrumentation for Astronomy IV
País/TerritorioPaíses Bajos
CiudadAmsterdam
Período1/07/126/07/12

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