Radiation-induced transient effects in HgCdTe IR focal plane arrays

Jim C. Pickel; Robert A. Reed; Paul W. Marshall; Augustyn Waczynski; Elizabeth J. Polidan; Scott Johnson; Robert McMurray; Mark McKelvey; Kimberly Ennico; Roy Johnson; George Gee

doi:10.1117/12.553079

12 October 2004 Radiation-induced transient effects in HgCdTe IR focal plane arrays

Jim C. Pickel, Robert A. Reed, Paul W. Marshall, Augustyn Waczynski, Elizabeth J. Polidan, Scott Johnson, Robert McMurray, Mark McKelvey, Kimberly Ennico, Roy Johnson, George Gee

Author Affiliations +

Proceedings Volume 5487, Optical, Infrared, and Millimeter Space Telescopes; (2004) https://doi.org/10.1117/12.553079
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The operability requirements of NASA's James Webb Space Telescope (JWST) impose specific challenges on radiation effects mitigation and analysis. For example, the NIRSpec Instrument has the following requirements: •The percentage of pixels defined as operable for target acquisition shall not be less than 97% (TBR) (goal 99%) of the total number of pixels... An inoperable pixel is: ο A dead pixel: a pixel with no radiometric response o A noisy pixel: a pixel with a total noise greater than 21 e-, per Fowler 8 exposure •The percentage of pixels defined as operable for science observations shall not be less than 92% (TBR) (goal 98%) of the total number of pixels... An inoperable pixel is: ο A dead/low-DQE pixel: a pixel deviating by >30% from the DQE mean value ο A noisy pixel: a pixel with a total noise greater than 12 e- (goal 9e-). With these performance requirements and operation in space, the radiation environment from galactic cosmic rays (GCR), energetic solar particles, and activation of spacecraft materials can contribute significantly to the number of inoperable pixels. The two most important issues to date are radiation-induced transient effects and hot pixels. This paper focuses on the methods used to assess the impact of ionizing radiation induced transients on the HgCdTe SCA selected by JWST. Hot pixel effects in these detectors has been previously presented. Both effects are currently under investigation.

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Jim C. Pickel, Robert A. Reed, Paul W. Marshall, Augustyn Waczynski, Elizabeth J. Polidan, Scott Johnson, Robert McMurray, Mark McKelvey, Kimberly Ennico, Roy Johnson, and George Gee "Radiation-induced transient effects in HgCdTe IR focal plane arrays", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); https://doi.org/10.1117/12.553079

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