Contribution of low-energy protons to the degradation of shielded GaAs solar cells in space
✍ Scribed by G. P. Summers; S. R. Messenger; E. A. Burke; M. A. Xapsos; R. J. Walters
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 181 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1062-7995
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✦ Synopsis
The cumulative fraction of the displacement damage dose deposited in shielded GaAs solar cells in typical space proton environments is presented as a function of energy from the threshold for atomic displacement up to 400 MeV. Results are presented for silica coverglass thicknesses from 3±30 mils, and for both slowed down and incident proton energies. As an example, it is found that for cells shielded by 30 mils of coverglass in a circular 5000 km orbit, less than 15% of the degradation is caused by protons with slowed down energies 50 . 1 MeV, whereas $50% of the total degradation is produced by protons in the energy range 1 5 E 5 10 MeV.