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Multi-level parallel clocking of CCDs for: improving charge transfer efficiency, clearing persistence, clocked anti-blooming, and generating low-noise backgrounds for pumping

Murray, Neil J.; Burt, David J.; Holland, Andrew D.; Stefanov, Konstantin D.; Gow, Jason P. D.; MacCormick, Calum; Dryer, Ben J. and Allanwood, Edgar A. H. (2013). Multi-level parallel clocking of CCDs for: improving charge transfer efficiency, clearing persistence, clocked anti-blooming, and generating low-noise backgrounds for pumping. In: UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, SPIE, article no. 8860-20.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1117/12.2024839
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Abstract

A multi-level clocking scheme has been developed to improve the parallel CTE of four-phase CCDs by suppressing the effects of traps located in the transport channel under barrier phases by inverting one of these phases throughout the transfer sequence. In parallel it was apparent that persistence following optical overload in Euclid VIS detectors would lead to undesirable signal released in subsequent rows and frames and that a suitable scheme for flushing this signal would be required. With care, the negatively biased electrodes during the multi-level transfer sequence can be made to pin the entire surface, row-by-row, and annihilate the problematic charges. This process can also be extended for use during integration to significantly reduce the unusable area of the detector, as per the clocked anti-blooming techniques developed many years ago; however, with the four-phase electrodes architecture of modern CCDs, we can take precautionary measures to avoid the problem of charge pumping and clock induced charge within the science frames. Clock induced charge is not all bad! We also propose the use of on-orbit trap-pumping for Euclid VIS to provide calibration input to ground based correction algorithms and as such a uniform, low noise background is require. Clock induced charge can be manipulated to provide a very suitable, low signal and noise background to the imaging array. Here we describe and present results of multi-level parallel clocking schemes for use in four-phase CCDs that could improve performance of high precision astronomy applications such as Euclid VIS.

Item Type: Conference or Workshop Item
Copyright Holders: 2013, Society of Photo-Optical Instrumentation Engineers
ISBN: 0-8194-9710-X, 978-0-8194-9710-9
ISSN: 0277-786X
Extra Information: UV/Optical/IR Space Telescopes and Instruments: Innovative
Technologies and Concepts VI,
edited by Howard A. MacEwen, James B. Breckinridge,
Proceedings of SPIE Vol. 8860
Keywords: CCD; CAB; CIC; BFW; SFW; tri-level; multi-level; Euclid VIS; CTE; persistence; blooming
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 39059
Depositing User: Jason Gow
Date Deposited: 25 Nov 2013 09:57
Last Modified: 03 Jan 2017 18:44
URI: http://oro.open.ac.uk/id/eprint/39059
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