Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jsara...2...64p&link_type=abstract
Journal of the Southeastern Association for Research in Astronomy, vol. 2, p. 64-70
Astronomy and Astrophysics
Astronomy
Charge Coupled Devices, Ccds, Supernova Acceleration Probe, Snap, Dark Energy, Dark Matter, Cosmology
Scientific paper
In 1929 Edwin Hubble discovered the universe's expansion. Seventy years later it was unexpectedly found that the rate of expansion is accelerating due to some vast cosmic energy. This cosmic energy, apparently gravitationally repulsive and spread homogeneously through the universe, has come to be known as dark energy. To better understand this universal force, scientists utilize Type Ia supernovae and weak gravitational lensing as cosmological probes. Lawrence Berkeley National Laboratory (LBNL) is developing the Supernova Acceleration Probe (SNAP), a proposed space-based telescope that will be used to identify and measure supernovae and measure weak gravitational lensing signals across fifteen square degrees of the sky. The SNAP telescope will incorporate an innovative camera that consists of back-illuminated, high-resistivity, p-channel charged coupled devices (CCDs) for visible to near-infrared light detection. Presented are results obtained from the measurement and analysis of a 10.5 μm pixel pitch, 1.4k by 1.4k format, p-channel CCD fabricated on high-resistivity silicon at LBNL. The fully depleted device is 300 μm thick and backside illuminated. We report on the first measurement of the intrapixel sensitivity and spatial variations of these CCDs. We also report measurements of electric field distortions near the edges of the CCD active area.
Oluseyi Hakeem M.
Puls Jason
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