Lateral Diffusion Estimation in Fully Depleted Thick CCD Using Flat Field Image Analysis

Journal Article · Thu Aug 25 04:00:00 EDT 2011 · Nuclear Instruments and Methods in Physics Research, Section A

DOI:https://doi.org/10.1016/j.nima.2010.08.058· OSTI ID:1034059

Kotov, I V; O'Connor, P; Kotov, A I; Frank, J; Kubanek, P; Radeka, V; Takacs, P

In thick fully depleted CCDs charge carrier transport from the back window to the gates is accompanied by charge diffusion. Lateral diffusion smooths out density variations of the incoming photon flux by redistributing charges spatially. This creates short range positive correlations in recorded amplitudes. Pixel-to-pixel amplitude variations can also be caused by pixel size and quantum efficiency variations. Pixel size variations result in short range negative correlations. Our study shows that the characteristic diffusion width can be extracted from flat field data. The study was performed on fully depleted, thick CCDs produced in a technology study for the Large Synoptic Survey Telescope (LSST). Data were taken in the laboratory at bias voltages between -5 and -40 V. To increase statistical accuracy, images taken in identical conditions were co-added after base line subtraction and master files were produced. A flat field image simulator was developed for statistical comparison of simulated and measured images. Results on diffusion, pixel response variations, data features, analysis and modeling techniques are presented and discussed.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1034059
• Report Number(s): BNL--96355-2011-JA; KA-04
• Journal Information: Nuclear Instruments and Methods in Physics Research, Section A, Journal Name: Nuclear Instruments and Methods in Physics Research, Section A Journal Issue: 1 Vol. 652; ISSN NIMAER; ISSN 0168-9002
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
AMPLITUDES
CHARGE CARRIERS
DIFFUSION
PHOTONS
QUANTUM EFFICIENCY
SIMULATION
SIMULATORS
TELESCOPES
TRANSPORT