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Particle radiation near the orbit of the Vacuum Wake ShieldThe particle populations that are expected to inflict the most damage on thin film materials grown on the vacuum Wake Shield Facility (WSF) are ions and energetic neutral atoms with energies in the range of 100 eV to 20 keV. The production of films that have an order of magnitude fewer defects than are now available requires that the 1-keV particle flux be kept lower than 1000 particles/(sq cm s sr keV) (assuming a reasonable spectral shape). WSF will be flown on orbits with an inclination of 28 deg at altitudes of 300-700 km. Because of the background counting rate produced by the about 100 MeV trapped protons in the inner belt, obtaining accurate measurements of the particles of interest is very difficult. The quiet-time background fluxes of the relevant particles are not presently known. At times of magnetic activity, fluxes of 0.1-17 keV O(+) ions as great as 10 million ions/(sq cm s sr keV) have been observed flowing out of the ionosphere at these latitudes. It appears that instrumentation for detailed assessment is essential for the proof-of-concept flight(s) and that real-time monitoring of low-energy ion and energetic neutral radiation will be required for the production flights.
Document ID
19900036202
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bering, Edgar A., III
(Houston Univ. TX, United States)
Ignatiev, Alex
(Houston, University TX, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 27
ISSN: 0022-4650
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
90A23257
Funding Number(s)
CONTRACT_GRANT: NAS5-28710
CONTRACT_GRANT: NAGW-977
Distribution Limits
Public
Copyright
Other

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