Application of thin foils in low-energy neutral-atom detection

Herbert O. Funsten III; David J. McComas; Bruce L. Barraclough

doi:10.1117/12.60580

1 June 1992 Application of thin foils in low-energy neutral-atom detection

Herbert O. Funsten III, David J. McComas, Bruce L. Barraclough

Proceedings Volume 1744, Instrumentation for Magnetospheric Imagery; (1992) https://doi.org/10.1117/12.60580
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

Herbert O. Funsten III, David J. McComas, and Bruce L. Barraclough "Application of thin foils in low-energy neutral-atom detection", Proc. SPIE 1744, Instrumentation for Magnetospheric Imagery, (1 June 1992); https://doi.org/10.1117/12.60580

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available