The Dark Energy Survey

1
The Dark Energy Survey

• A study of the dark energy using four
  independent and complementary techniques
• Two linked, multiband optical surveys
• 5000 deg2 g, r, i and z
• Repeated observations of 40 deg2 for SN studies
  (10 of the survey time).
• Instrument and schedule
• New 3 deg2 camera on the Blanco 4m on Cerro
  Tololo
• Construction 2004-2009
• Survey Operations 30 of telescope time over 5
  years

DES cosmology Using angular power spectrum
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Focal Plane

• DES focal plane
• 50 cm diameter
• 62 CCDs (2k x 4k)
• 500 Mpix
• 3 square degrees

3556 mm
Camera
Scroll Shutter
Filters
Lenses

• QEgt 50 at 1000 nm
• 250 microns thick
• readout 250 kpix/sec
• 2 RO channels/device
• readout time 17sec

3
CCD characterization at Fermilab
Detectors will be characterized before
installation. We anticipate testing 200 devices,
1 per day.
LN2 5 liters
vacuum
Motorized filter wheel (6 positions)
Intregrating sphere 6 Calibrated photodiode
Full scale system test will also be performed at
Fermillab (6 CCDs).
CCD dewar