Computer Science – Performance
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ingn....7...25t&link_type=abstract
The Newsletter of the Isaac Newton Group of Telescopes (ING Newsl.), issue no. 7, p. 25-26.
Computer Science
Performance
L3 Ccd, Detector
Scientific paper
Low Light Level (L3) CCD technology is a recent development from E2V that opens up interesting new observational regimes. The technology allows production of scientific CCDs in which the read noise of the on-chip amplifier becomes negligibly low. Additionally, this effective zero-noise performance is decoupled from readout speeds and the almost zero noise performance holds up to frame rates of 1KHz. E2V achieve this by using an avalanche multiplication mechanism in the horizontal register of the CCD. A single photo-electron entering this register exits as a substantial charge packet; the exact gain being variable and determined by the level of a high voltage multiplication clock. At gain levels of around 500 it becomes possible to identify individual photon events in the image. The downside of L3 technology is that the multiplication process degrades the SNR at higher signals by a factor of 2^1/2 . There is also a small additional noise contribution from spuriously generated electrons within the device.
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