Modeling of proton-induced CCD degradation in the Chandra X-ray Observatory

Modeling results are presented for proton-induced degradation of charge-coupled devices (CCDs) used in the Advanced CCD Imaging Spectrometer instrument on the Chandra X-Ray Observatory. A methodology is described that provides insights regarding degradation mechanisms and on-orbit performance for fr...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2003-12, Vol.50 (6), p.2018-2023
Main Authors: Lo, D.H., Srour, J.R.
Format: Article
Language:English
Subjects:
Charge coupled devices
Charge transfer
Degradation
Instruments
Mathematical models
Observatories
Optical imaging
Protons
Shape
Space environment
Spacecraft
Spectroscopy
X-ray imaging
X-rays
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Description
Summary:Modeling results are presented for proton-induced degradation of charge-coupled devices (CCDs) used in the Advanced CCD Imaging Spectrometer instrument on the Chandra X-Ray Observatory. A methodology is described that provides insights regarding degradation mechanisms and on-orbit performance for front-illuminated and back-illuminated CCDs. Proton-induced changes in charge transfer inefficiency are modeled. The observed amount of on-orbit degradation can be accounted for using a proton spectrum at the CCD location that has the same shape as the spectrum incident on the spacecraft but has a fluence that is reduced in magnitude by a factor of /spl sim/10/sup 5/.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2003.820735