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Journal of Astronomical Telescopes, Instruments, and Systems

Technology advancement of the CCD201-20 EMCCD for the WFIRST coronagraph instrument: sensor characterization and radiation damage
Author(s): Leon K. Harding; Richard Demers; Michael E. Hoenk; Pavani Peddada; Bijan Nemati; Michael Cherng; Darren Michaels; Leo S. Neat; Anthony Loc; Nathan L. Bush; David J. Hall; Neil J. Murray; Jason P. D. Gow; Ross Burgon; Andrew D. Holland; Alice L. Reinheimer; Paul R. Jorden; Douglas Jordan
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Paper Abstract

The Wide Field InfraRed Survey Telescope-Astrophysics Focused Telescope Asset (WFIRST-AFTA) mission is a 2.4-m class space telescope that will be used across a swath of astrophysical research domains. JPL will provide a high-contrast imaging coronagraph instrument—one of two major astronomical instruments. In order to achieve the low noise performance required to detect planets under extremely low flux conditions, the electron multiplying charge-coupled device (EMCCD) has been baselined for both of the coronagraph’s sensors—the imaging camera and integral field spectrograph. JPL has established an EMCCD test laboratory in order to advance EMCCD maturity to technology readiness level-6. This plan incorporates full sensor characterization, including read noise, dark current, and clock-induced charge. In addition, by considering the unique challenges of the WFIRST space environment, degradation to the sensor’s charge transfer efficiency will be assessed, as a result of damage from high-energy particles such as protons, electrons, and cosmic rays. Science-grade CCD201-20 EMCCDs have been irradiated to a proton fluence that reflects the projected WFIRST orbit. Performance degradation due to radiation displacement damage is reported, which is the first such study for a CCD201-20 that replicates the WFIRST conditions. In addition, techniques intended to identify and mitigate radiation-induced electron trapping, such as trap pumping, custom clocking, and thermal cycling, are discussed.

Paper Details

Date Published: 14 December 2015
PDF: 31 pages
J. Astron. Telesc. Instrum. Syst. 2(1) 011007 doi: 10.1117/1.JATIS.2.1.011007
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 1
Show Author Affiliations
Leon K. Harding, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Richard Demers, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Michael E. Hoenk, Jet Propulsion Lab. (United States)
Pavani Peddada, Jet Propulsion Lab. (United States)
Bijan Nemati, Jet Propulsion Lab. (United States)
Michael Cherng, Jet Propulsion Lab. (United States)
Darren Michaels, Jet Propulsion Lab. (United States)
Leo S. Neat, Jet Propulsion Lab. (United States)
Anthony Loc, Jet Propulsion Lab. (United States)
Nathan L. Bush, The Open Univ. (United Kingdom)
David J. Hall, The Open Univ. (United Kingdom)
Neil J. Murray, The Open Univ. (United Kingdom)
Jason P. D. Gow, The Open Univ. (United Kingdom)
Ross Burgon, The Open Univ. (United Kingdom)
Andrew D. Holland, The Open Univ. (United Kingdom)
Alice L. Reinheimer, e2v Aerospace and Defense, Inc. (United States)
Paul R. Jorden, e2v technologies plc (United Kingdom)
Douglas Jordan, e2v technologies (UK) Ltd. (United Kingdom)

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