Oxygen and Proton Ion Implantation In The Solar Panel Coverglass Of GPS Satellites

Details Oxygen and Proton Ion Implantation In The Solar Panel Coverglass Of GPS Satellites Oxygen and Proton Ion Implantation In The Solar Panel Coverglass Of GPS Satellites

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41a1173t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM41A-1173

Physics

2730 Magnetosphere: Inner, 2732 Magnetosphere Interactions With Satellites And Rings, 2794 Instruments And Techniques, 2799 General Or Miscellaneous

Scientific paper

Global Positioning Satellites (GPS) have been experiencing an anomalous degradation of solar array power. This power loss, greater than the anticipated silicon cell damage by MeV electrons, remains unexplained. Low-energy ions have been identified as a possible cause of degradation of solar panel coverglass materials. Ion implantation in the (100-nm-thick) anti-reflection coating of the coverglass could cause darkening, and associated transmission loss. We investigate this hypothesis by irradiating various GPS flight configuration coverglass samples in simulated O+ and H+ environments based on modeling of the average ion environment at GPS orbit (20,000 km altitude). The ion implants (ion energies from 0.1 to 400 keV) are performed up to a 20-year-equivalent final dose. Coverglass samples from GPS Block IIA, IIR, IIF, and also from some geosynchronous satellites are implanted with several facilities: a plasma immersion ion implanter (up to 10 keV), a low-energy ion beam implanter (up to 60 keV), and a high-energy beam implanter (up to 400 keV). After each implant step, the optical transmission of the samples are measured from 200 to 900 nm. Implants to date suggest that a combination of oxygen and proton damage could account for part of the unexplained solar panel power loss. The latest results of this investigation will be presented.

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