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Stable dielectric charge distributions from field enhancement of secondary missionThe emission of secondary electrons from dielectrics subject to numerous effects of electric field which are experimentally difficult to control is discussed. Measurements are reported using pulse techniques such that local fields do not build to significant levels, but measurements with fields present are also of interest. A specific series of measurements under controlled conditions are described and their implications in terms of fields, magnitude and angle, near the dielectric surface were examined. The measurements were made for a charged fluorinated-ethylene-propylene surface near a grounded aluminum half-round resting on the surface. The geometry produced a stable surface-charge gradient being controlled by a strongly enhanced secondary emission for which a model is constructed. Observations of surface flashovers under various conditions confirm the predictions of some scaling exercises.
Document ID
19790015875
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Robinson, J. W.
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Publication Information
Publication: NASA. Lewis Res. Center Spacecraft Charging Technol., 1978
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
79N24046
Funding Number(s)
CONTRACT_GRANT: NSG-3097
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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