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Deep dialectric charging of spacecraft polymers by energetic protons.

Show simple item record Green, Nelson W. Dennison, J. R. 2009-05-12T16:55:05Z 2009-05-12T16:55:05Z 2007-06-18
dc.identifier.citation 10th Spacecraft Charging Technology Conference, Biarritz, France, June 18-21, 2007, en_US
dc.identifier.clearanceno 07-1801
dc.description.abstract The majority of research in the field of spacecraft charging concentrates on electron charging effects with little discussion of charging by protons. For spacecraft orbiting in the traditional LEO and GEO environments this emphasis on electrons is appropriate since energetic electrons are the dominant species in those orbits. But for spacecraft in orbits within the inner radiation belts or for interplanetary and lunar space probes, proton charging effects may also be of concern. To examine bulk spacecraft charging effects in these environments several typical highly insulating spacecraft polymers were exposed to energetic protons with energies from 1 Me V to lO Me V to simulate protons from the solar wind and from solar energetic proton events. Results indicate that effects in proton charged dielectrics are distinctly different than those observed due to electron charging. In most cases, the positive surface potential continued to increase for periods on the order of minutes to a day, followed by long time scale decay at rates similar to those observed for electron charging. All samples charged to positive potentials with substantially lower magnitudes than for equivalent electron doses. Possible explanations for the different behavior of the measured surface potentials from proton irradiation are discussed; these are related to the evolving internal charge distribution from energy dependant electron and proton transport, electron emission, charge migration due to dark current and radiation induced conductivity, and electron capture by embedded protons. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2007. en_US
dc.subject spacecraft charging en_US
dc.subject proton en_US
dc.subject radiation induced conductivity en_US
dc.title Deep dialectric charging of spacecraft polymers by energetic protons. en_US
dc.type Preprint en_US

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