Special Section on WFIRST-AFTA Coronagraphs

Technology advancement of the CCD201-20 EMCCD for the WFIRST coronagraph instrument: sensor characterization and radiation damage

[+] Author Affiliations
Leon K. Harding, Richard T. Demers, Michael Hoenk, Pavani Peddada, Bijan Nemati, Michael Cherng, Darren Michaels, Leo S. Neat, Anthony Loc

Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States

Nathan Bush, David Hall, Neil Murray, Jason Gow, Ross Burgon, Andrew Holland

Open University, Centre for Electronic Imaging, Department of Physical Sciences, Walton Hall, Milton Keynes MK7 6AA, United Kingdom

Alice Reinheimer

e2v Inc., 765 Sycamore Drive, Milpitas, California 95035, United States

Paul R. Jorden, Douglas Jordan

e2v Technologies, 106 Waterhouse Lane, Chelmsford, Essex CM1 2QU, United Kingdom

J. Astron. Telesc. Instrum. Syst. 2(1), 011007 (Dec 14, 2015). doi:10.1117/1.JATIS.2.1.011007
History: Received June 3, 2015; Accepted October 28, 2015
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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.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Leon K. Harding ; Richard T. Demers ; Michael Hoenk ; Pavani Peddada ; Bijan Nemati, et al.
"Technology advancement of the CCD201-20 EMCCD for the WFIRST coronagraph instrument: sensor characterization and radiation damage", J. Astron. Telesc. Instrum. Syst. 2(1), 011007 (Dec 14, 2015). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011007


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