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Proceedings Paper

Radiation environment performance of JWST prototype FPAs
Author(s): Mark E. McKelvey; Kimberly A. Ennico; Roy R. Johnson; Paul W. Marshall; Robert E. McMurray; Craig R. McCreight; Jim C. Pickel; Robert A. Reed
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Paper Abstract

As the logical extension of the 20-year mission of the Hubble Space Telescope, NASA plans to launch the James Webb Space Telescope (JWST, formerly NGST) near the end of this decade. As Hubble's scientific and technological successor, equipped with a 6-meter-class deployable mirror, JWST will allow observations of the very early universe and initial formation of galaxies at levels not achievable today. JWST's unprecedented sensitivity cannot be utilized without a new class of IR focal plane arrays whose performance matches that of the telescope. In particular, JWST focal planes must be able to withstand the ionizing-particle radiation environment expected for its Lagrange-point (L2) orbit and ten-year mission lifetime goal. To help determine their suitability for JWST, NASA is evaluating prototype megapixel-class readouts and hybrid detector arrays under proton bombardment to simulate the anticipated JWST lifetime radiation dose. This report describes the results of early tests on devices from two manufacturers using photovoltaic (HgCdTe or InSb) candidate near-infrared detector structures. Results to date have shown encouraging performance, along with some areas of continuing concern.

Paper Details

Date Published: 12 January 2004
PDF: 12 pages
Proc. SPIE 5167, Focal Plane Arrays for Space Telescopes, (12 January 2004); doi: 10.1117/12.508050
Show Author Affiliations
Mark E. McKelvey, NASA Ames Research Ctr. (United States)
Kimberly A. Ennico, NASA Ames Research Ctr. (United States)
Roy R. Johnson, NASA Ames Research Ctr. (United States)
Paul W. Marshall, Consultant (United States)
Robert E. McMurray, NASA Ames Research Ctr. (United States)
Craig R. McCreight, NASA Ames Research Ctr. (United States)
Jim C. Pickel, PR&T, Inc. (United States)
Robert A. Reed, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 5167:
Focal Plane Arrays for Space Telescopes
Thomas J. Grycewicz; Craig R. McCreight, Editor(s)

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