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17 October 2019 Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors
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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.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2019/$28.00 © 2019 SPIE
Adam Snyder and Aaron Roodman "Investigation of deferred charge effects in Large Synoptic Survey Telescope ITL sensors," Journal of Astronomical Telescopes, Instruments, and Systems 5(4), 041509 (17 October 2019). https://doi.org/10.1117/1.JATIS.5.4.041509
Received: 8 June 2019; Accepted: 23 September 2019; Published: 17 October 2019
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CHORUS Article. This article will be made freely available starting 16 October 2020

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