Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2201f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #22.01; Bulletin of the American Astronomical Society, V
Other
3
Scientific paper
The Dark Energy Survey (DES) is designed to measure the dark energy equation of state parameter, w, to a statistical precision of 5%, with four complementary techniques: galaxy cluster counts, weak lensing, angular power spectrum and type Ia supernovae. We present an overview of the DES instrument (DECam) which will be mounted at the prime focus of the Blanco 4m telescope at the Cerro-Tololo International Observatory (CTIO). DECam includes a focal plane of 62 2kx4k CCDs, a five element optical corrector, four filters (g,r,i,z), and the associated infrastructure for operation in a new prime focus cage. To reach redshifts of 1, we plan to use the 250 micron thick fully-depleted CCDs that have been developed at the Lawrence Berkeley National Laboratory (LBNL). A CCD packaging and testing facility has been established at Fermilab to produce fully characterized four-side buttable modules. DECam also includes design features to enhance the image quality and the efficiency of operations. DECam will be devoted to the DES for 30% of the time over the five year survey and will otherwise be available to the community as an NOAO facility instrument. Status of the design and prototyping efforts will be described.
Dark Energy Survey Collaboration
Flaugher Brenna
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