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Proceedings Paper

Application of thin foils in low-energy neutral-atom detection
Author(s): Herbert O. Funsten; David J. McComas; Bruce L. Barraclough
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Paper Abstract

Magnetospheric imaging has been proposed using remote detection of low energy neutral atoms (LENAS) of magnetospheric origin. In the detector, LENAS can be removed from the immense ambient UV by charge state modification (ionization) using a carbon stripping foil and can be subsequently deflected into an EIq analysis section. The LENA detector efficiency is linearly proportional to the ionization probability of neutrals as they transit the foil. In this study, we present equilibrium charge state and scatter distributions for 1-30 keV atomic hydrogen and oxygen transiting nominal 0.5 cm2 carbon foils. The fraction of hydrogen exiting a foil as H ranges from approximately 5% at 1 keV to 41% at 30 keV. The fraction of oxygen exiting the foil as O ranges from approximately 2% at 10 keY to 8% at 30 keV. Results obtained after coating the exit surface of foils with either aluminum (which forms aluminum oxide when exposed to air) or gold suggest that the intended alteration of the exit surface chemistry has no effect on the charge state distributions due to foil contamination from exposure to air. Scattering that results from the projectilefoil interaction is shown to be independent of the charge state distribution, illustrating the distinctly different interaction mechanisms associated with charge exchange and scattering.

Paper Details

Date Published: 1 June 1992
PDF: 8 pages
Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992); doi: 10.1117/12.60580
Show Author Affiliations
Herbert O. Funsten, Los Alamos National Lab. (United States)
David J. McComas, Los Alamos National Lab. (United States)
Bruce L. Barraclough, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 1744:
Instrumentation for Magnetospheric Imagery
Supriya Chakrabarti, Editor(s)

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