SSG Workshop2013.02.13-16

경희대김은빈김민배천경원

The GMT-CfA, Car-nagie, Catolica, Chicago Large Earth Finder (G-CLEF)

• A fiber fed, optical echelle spectrograph• Precision radial velocity capability (PRV): dV<10cm/sec• Observation mode : High- Throughput (HT), Precision-

Abundance (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 mul-

tiplex of ~40 fibers

* C o l l a b o r a t i o n : S m i t h s o n i a n A s t ro p h ys i c a l Ob s e r v a t o r y , Po n t i fi c i a Un i v e r s i d a d C a t o l i c a d e C h i l e , Un i ve r s i t y o f C h i c a g o , H a r va rd U n i v e r s i t y , Ob s e r va t o r i e s o f t h e C a rn e g i e I n s t i t u t e o f Wa s h i n g t o n

G-CLEF

SCIENTIFIC GOAL

Science Goal Required Perfomance Parame-ter

Abundance studiesDetection and census of metal poor stars

High resolutionExtended blue response to 3500 A

High z IGM and ISM/Gamma Ray Burst

Rapid instrument changeoverExtended red response

Exoearth science Very high resolutionLong term wavelength stability

Detailed chemical composition be-yond 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 pa-rameters

G-CLEF OPTICAL DESIGN

G-CLEF echellograms

G-CLEF OPTICAL DESIGN

Efficiency of the spectrograph

Schematic of G-CLEF thermal enclosure design

THERMO-MECHANICAL DESIGN

Mechanical design of the G-CLEF spectrograph and vacuum enclosure

THERMO-MECHANICAL DESIGN

SCHEDULE

REFERENCES

Szentgyorgyi, A. et al. 2011k-gmt.kasi.re.kr/html/GMT/kasi.re.kr/event/2012-06-11_K-GMT_Summer_School/

GMT_Instruments-spec.pdfhttp://www.gmto.org