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Proceedings Paper

Wide Field Camera 3 CCD quantum efficiency hysteresis: characterization and mitigation
Author(s): Nicholas R. Collins; Nicholas Boehm; Gregory Delo; Roger D. Foltz; Robert J. Hill; Emily Kan; Randy A. Kimble; Eliot Malumuth; Robert Rosenberry; Augustyn Waczynski; Yiting Wen; Sylvia Baggett; Howard Bushouse; Susana Deustua; Jessica Kim-Quijano; John MacKenty; Andre Martel; Elena Sabbi
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Paper Abstract

In ground testing of the Hubble Space Telescope Wide Field Camera 3 (HST/WFC3), the CCDs of its UV/visible channel exhibited an unanticipated quantum efficiency hysteresis (QEH) behavior. The QEH first manifested itself as an occasionally observed contrast in response across the format of the CCDs, with an amplitude of typically 0.1-0.2% or less at the nominal -83°C operating temperature, but with contrasts of up to 3-5% observed at warmer temperatures. The behavior has been replicated in the laboratory using flight spare detectors and has been found to be related to an initial response deficiency of ~5% amplitude when the CCDs are cooled with no illumination. A visible light flat-field (540nm) with a several times full-well signal level is found to pin the detector response at both optical (600nm) and near-UV (230nm) wavelengths, suppressing the QEH behavior. We have characterized the timescale for the detectors to become unpinned (days for significant response loss at -83°C and have developed a protocol to stabilize the response in flight by flashing the WFC3 CCDs with the instrument's internal calibration system.

Paper Details

Date Published: 17 September 2009
PDF: 12 pages
Proc. SPIE 7439, Astronomical and Space Optical Systems, 74390B (17 September 2009); doi: 10.1117/12.828439
Show Author Affiliations
Nicholas R. Collins, Wyle IS (United States)
NASA Goddard Space Flight Ctr. (United States)
Nicholas Boehm, NASA Goddard Space Flight Ctr. (United States)
Stinger Ghaffarian Technologies (United States)
Gregory Delo, NASA Goddard Space Flight Ctr. (United States)
Global Science & Technology Inc. (United States)
Roger D. Foltz, NASA Goddard Space Flight Ctr. (United States)
Sigma Space Corp. (United States)
Robert J. Hill, NASA Goddard Space Flight Ctr. (United States)
Conceptual Analytics, LLC (United States)
Emily Kan, NASA Goddard Space Flight Ctr. (United States)
Stinger Ghaffarian Technologies (United States)
Randy A. Kimble, NASA Goddard Space Flight Ctr. (United States)
Eliot Malumuth, Wyle IS (United States)
NASA Goddard Space Flight Ctr. (United States)
Robert Rosenberry, NASA Goddard Space Flight Ctr. (United States)
Qinetiq North America (United States)
Augustyn Waczynski, NASA Goddard Space Flight Ctr. (United States)
Stinger Ghaffarian Technologies (United States)
Yiting Wen, NASA Goddard Space Flight Ctr. (United States)
Muniz Engineering Inc. (United States)
Sylvia Baggett, Space Telescope Science Institute (United States)
Howard Bushouse, Space Telescope Science Institute (United States)
Susana Deustua, Space Telescope Science Institute (United States)
Jessica Kim-Quijano, Space Telescope Science Institute (United States)
John MacKenty, Space Telescope Science Institute (United States)
Andre Martel, Space Telescope Science Institute (United States)
Elena Sabbi, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 7439:
Astronomical and Space Optical Systems
Penny G. Warren; James B. Heaney; Robert K. Tyson; Michael Hart; E. Todd Kvamme; Cheryl J. Marshall, Editor(s)

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