Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors
Abstract
The traditional characterization of charge transfer inefficiency (CTI) in charge-coupled devices (CCDs) can suffer from a number of deficiencies: CTI is often only calculated for a limited number of signal levels, CTI is calculated from a limited number of pixels, and the sources of CTI are usually assumed to occur at every pixel-to-pixel transfer. A number of serial CTI effects have been identified during preliminary testing of CCDs developed by Imaging Technology Laboratory (ITL) for use in the Large Synoptic Survey Telescope camera focal plane that motivated a more comprehensive study of CTI for these sensors. Our study describes a more detailed examination of the serial deferred charge effects in order to fully characterize the deferred charge measured in the serial overscan pixels of these sensors. The results indicate that in addition to proportional CTI loss that occurs at each pixel transfer, ITL CCDs have additional contributions to the deferred charge measured in serial overscan pixels, likely caused by fixed CTI loss due to charge trapping, and an electronic offset drift at high signal.
- Authors:
-
- Stanford University, Department of Physics, Stanford, California
- Stanford University, Kavli Institute for Particle Astrophysics and Cosmology, Stanford, California
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1570802
- Alternate Identifier(s):
- OSTI ID: 1605207
- Grant/Contract Number:
- AC02-76SF00515; 1258333
- Resource Type:
- Published Article
- Journal Name:
- Journal of Astronomical Telescopes, Instruments, and Systems
- Additional Journal Information:
- Journal Name: Journal of Astronomical Telescopes, Instruments, and Systems Journal Volume: 5 Journal Issue: 04; Journal ID: ISSN 2329-4124
- Publisher:
- SPIE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Snyder, Adam, and Roodman, Aaron. Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors. United States: N. p., 2019.
Web. doi:10.1117/1.JATIS.5.4.041509.
Snyder, Adam, & Roodman, Aaron. Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors. United States. https://doi.org/10.1117/1.JATIS.5.4.041509
Snyder, Adam, and Roodman, Aaron. Tue .
"Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors". United States. https://doi.org/10.1117/1.JATIS.5.4.041509.
@article{osti_1570802,
title = {Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors},
author = {Snyder, Adam and Roodman, Aaron},
abstractNote = {The traditional characterization of charge transfer inefficiency (CTI) in charge-coupled devices (CCDs) can suffer from a number of deficiencies: CTI is often only calculated for a limited number of signal levels, CTI is calculated from a limited number of pixels, and the sources of CTI are usually assumed to occur at every pixel-to-pixel transfer. A number of serial CTI effects have been identified during preliminary testing of CCDs developed by Imaging Technology Laboratory (ITL) for use in the Large Synoptic Survey Telescope camera focal plane that motivated a more comprehensive study of CTI for these sensors. Our study describes a more detailed examination of the serial deferred charge effects in order to fully characterize the deferred charge measured in the serial overscan pixels of these sensors. The results indicate that in addition to proportional CTI loss that occurs at each pixel transfer, ITL CCDs have additional contributions to the deferred charge measured in serial overscan pixels, likely caused by fixed CTI loss due to charge trapping, and an electronic offset drift at high signal.},
doi = {10.1117/1.JATIS.5.4.041509},
journal = {Journal of Astronomical Telescopes, Instruments, and Systems},
number = 04,
volume = 5,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 2019},
month = {Tue Oct 01 00:00:00 EDT 2019}
}
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https://doi.org/10.1117/1.JATIS.5.4.041509
https://doi.org/10.1117/1.JATIS.5.4.041509
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Cited by: 4 works
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Figures / Tables:
Fig. 1: LSST ITL CCD segment layout with segment name labels. Arrows indicate the direction of parallel and serial transfer during readout.
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.