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Proceedings Paper

Results from proton damage tests on the Michelson Doppler Imager CCD for SOHO
Author(s): Igor Zayer; Ira Chapman; Dexter W. Duncan; G. A. Kelly; Keith E. Mitchell
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Paper Abstract

Protons from solar flares represent the major threat to the scientific performance of a CCD in the SOHO orbit at L1, decreasing CTE and thus non-uniformly degrading the MTF of the detector. Lattice damage assessment and prediction rely on accurate radiation damage experiments to 'calibrate' numerical simulations and modeling. The energy ranges where TRIM and NIEL represent valid models overlap around a few MeV. Thus, the proton beam from Lockheed PARL's 0.1 to 3 MeV Van de Graaff generator provides a convenient test facility. We present results from an accurate experiment using 2 MeV protons on the MDI detector (LORAL 1024 X 1024 21 micrometers 3P MPP CCD). A premiere feature in the experiment is the achievement of a stable, uniform low fluence and extremely accurate dosimetry at this relatively low energy. Pre- and post-radiation CTE measurements for our specific mode of operation (relatively fast readout rate of 500 kpix/s) is obtained using Fe55 method over a wide temperature range. They reveal somewhat unexpected results. The damage is more severe to parallel CTE than to serial CTE and the former worsens when cooled down to -50 degree(s)C, then improves when cooled further.

Paper Details

Date Published: 12 July 1993
PDF: 11 pages
Proc. SPIE 1900, Charge-Coupled Devices and Solid State Optical Sensors III, (12 July 1993); doi: 10.1117/12.148604
Show Author Affiliations
Igor Zayer, Lockheed Palo Alto Research Labs. (United States)
Ira Chapman, Lockheed Palo Alto Research Labs. (United States)
Dexter W. Duncan, Lockheed Palo Alto Research Labs. (United States)
G. A. Kelly, Lockheed Palo Alto Research Labs. (United States)
Keith E. Mitchell, Lockheed Palo Alto Research Labs. (United States)


Published in SPIE Proceedings Vol. 1900:
Charge-Coupled Devices and Solid State Optical Sensors III
Morley M. Blouke, Editor(s)

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