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WFIRST coronagraph detector trap modeling results and improvements
Author(s): Robert Effinger; Bijan Nemati; Maxime Rizzo; Patrick Morrissey; Leon Harding; Michael Bottom; Donald Pontrelli; Richard Demers; Nathan Bush; David Hall; Andrew Clarke; Andrew Holland
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Paper Abstract

The WFIRST coronagraph is being designed to detect and characterize mature exoplanets through the starlight reflected from their surfaces and atmospheres. The light incident on the detector from these distant exoplanets is estimated to be on the order of a few photons per pixel per hour. To measure such small signals, the project has baselined the CCD201 detector made by e2v, a low-noise and high-efficiency electron-multiplying charge-coupled device (EMCCD), and has instituted a rigorous test and modeling program to characterize the device prior to flight. An important consideration is detector performance degradation over the proposed mission lifetime due to radiation exposure in space. To quantify this estimated loss in performance, the project has built a detector trap model that takes into account detailed trap interactions at the sub-pixel level, including stochastic trap capture and release, and the deferment of charge into subsequent pixels during parallel and serial clocking of the pseudo-two-phase CCD201 device. This paper describes recent detector trap model improvements and modeling results.

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070917 (6 July 2018); doi: 10.1117/12.2311408
Show Author Affiliations
Robert Effinger, Jet Propulsion Lab. (United States)
Bijan Nemati, The Univ. of Alabama in Huntsville (United States)
Maxime Rizzo, NASA Goddard Space Flight Ctr. (United States)
Patrick Morrissey, Jet Propulsion Lab. (United States)
Leon Harding, Jet Propulsion Lab. (United States)
Michael Bottom, Jet Propulsion Lab. (United States)
Donald Pontrelli, Villanova Univ. (United States)
Richard Demers, Jet Propulsion Lab. (United States)
Nathan Bush, e2v Ctr. for Electronic Imaging, The Open Univ. (United Kingdom)
David Hall, e2v Ctr. for Electronic Imaging, The Open Univ. (United Kingdom)
Andrew Clarke, e2v Ctr. for Electronic Imaging, The Open Univ. (United Kingdom)
Andrew Holland, e2v Ctr. for Electronic Imaging, The Open Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 10709:
High Energy, Optical, and Infrared Detectors for Astronomy VIII
Andrew D. Holland; James Beletic, Editor(s)

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