The GMT-CfA, Carnagie,
Catolica, Chicago Large
Earth Finder (G-CLEF)
SSG Workshop
2013.02.13-16
경희대
김은빈
김민배
천경원
G-CLEF
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A fiber fed, optical echelle spectrograph
Precision radial velocity capability (PRV): dV<10cm/sec
Observation mode : High- Throughput (HT), PrecisionAbundance (PA), and Precision Radial Velocity (PRV)
Respective resolving powers : R~25,000, 40,000 and
120,000
R~40,000 multi-object spectroscopy mode with a
multiplex of ~40 fibers
Collaboration : Smithsonian Astrophysical Observatory, Pontificia Universidad Catolica de Chile,
University of Chicago, Harvard University, Observatories of the Carnegie Institute
of Washington
SCIENTIFIC GOAL
Science Goal
Required Perfomance Parameter
Abundance studies
High resolution
Detection and census of metal poor stars Extended blue response to 3500 A
High z IGM and ISM/Gamma Ray Burst
Rapid instrument changeover
Extended red response
Exoearth science
Very high resolution
Long term wavelength stability
Detailed chemical composition beyond
the Local Group
Long slit length for multi object capability
G-CLEF SYSTEM DESIGN
G-CLEF SYSTEM DESIGN
G-CLEF OPTICAL DESIGN
G-CLEF Spectrograph optical layout
G-CLEF OPTICAL DESIGN
G-CLEF Spectrograph optical design parameters
G-CLEF OPTICAL DESIGN
G-CLEF echellograms
G-CLEF OPTICAL DESIGN
Efficiency of the spectrograph
THERMO-MECHANICAL DESIGN
Schematic of G-CLEF thermal enclosure design
THERMO-MECHANICAL DESIGN
Mechanical design of the G -CLEF spectrograph
and vacuum enclosure
SCHEDULE
REFERENCES
 Szentgyorgyi, A . et al. 2011
 k-gmt.kasi.re.kr/html/GMT/
 kasi.re.kr/event/2012-06-11_KGMT_Summer_School/GMT_Instruments -spec.pdf
 http://www.gmto.org