Data and Instrumentation Analysis Techniques and Methods

Comparing simulations and test data of a radiation damaged charge-coupled device for the Euclid mission

[+] Author Affiliations
Jesper Skottfelt, David J. Hall, Jason P. D. Gow, Neil J. Murray, Andrew D. Holland

Open University, Centre for Electronic Imaging, Department of Physical Sciences, Milton Keynes, United Kingdom

Thibaut Prod’homme

European Space Agency, European Space Research and Technology Centre, Noordwijk, The Netherlands

J. Astron. Telesc. Instrum. Syst. 3(2), 028001 (Apr 06, 2017). doi:10.1117/1.JATIS.3.2.028001
History: Received October 25, 2016; Accepted March 17, 2017
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Abstract.  The visible imager instrument on board the Euclid mission is a weak-lensing experiment that depends on very precise shape measurements of distant galaxies obtained by a large charge-coupled device (CCD) array. Due to the harsh radiative environment outside the Earth’s atmosphere, it is anticipated that the CCDs over the mission lifetime will be degraded to an extent that these measurements will be possible only through the correction of radiation damage effects. We have therefore created a Monte Carlo model that simulates the physical processes taking place when transferring signals through a radiation-damaged CCD. The software is based on Shockley–Read–Hall theory and is made to mimic the physical properties in the CCD as closely as possible. The code runs on a single electrode level and takes the three-dimensional trap position, potential structure of the pixel, and multilevel clocking into account. A key element of the model is that it also takes device specific simulations of electron density as a direct input, thereby avoiding making any analytical assumptions about the size and density of the charge cloud. This paper illustrates how test data and simulated data can be compared in order to further our understanding of the positions and properties of the individual radiation-induced traps.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Jesper Skottfelt ; David J. Hall ; Jason P. D. Gow ; Neil J. Murray ; Andrew D. Holland, et al.
"Comparing simulations and test data of a radiation damaged charge-coupled device for the Euclid mission", J. Astron. Telesc. Instrum. Syst. 3(2), 028001 (Apr 06, 2017). ; http://dx.doi.org/10.1117/1.JATIS.3.2.028001


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