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Optical Engineering

Mass spectrograph for imaging low-energy neutral atoms
Author(s): Arthur G. Ghielmetti; Edward G. Shelley; Stephen A. Fuselier; Peter Wurz; Peter A. Bochsler; Federico A. Herrero; Mark F. Smith; Thomas S. Stephen
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Paper Abstract

We describe an instrument concept for measuring low-energy neutral H and O atoms with kinetic energies ranging from about 10 eV to several hundred. The instrument makes use of a low work function surface to convert neutral atoms to negative ions. These ions are then accelerated away from the surface and brought to an intermediate focus by a large aperture lens. After deflection in a spherical electrostatic analyzer, the ions are postaccelerated to ~25-keV final energy into a carbon-foil time-of-flight mass analyzer. Mass resolution is adequate to resolve H, D, He, and O. Energy and azimuth angle information is obtained by means of position imaging the secondary electrons produced at the carbon foil. A large geometric factor combined with simultaneous angle-energy-mass imaging that eliminates the need for duty cycles provide the necessary high sensitivity. From a spinning spacecraft this instrument is capable of producing a 2-D map of low-energy neutral atom fluxes.

Paper Details

Date Published: 1 February 1994
PDF: 9 pages
Opt. Eng. 33(2) doi: 10.1117/12.155910
Published in: Optical Engineering Volume 33, Issue 2
Show Author Affiliations
Arthur G. Ghielmetti, Lockheed Palo Alto Research Lab. (United States)
Edward G. Shelley, Lockheed Palo Alto Research Lab. (United States)
Stephen A. Fuselier, Lockheed Palo Alto Research Lab. (United States)
Peter Wurz, Univ. Bern (Switzerland)
Peter A. Bochsler, Univ. Bern (Switzerland)
Federico A. Herrero, NASA Goddard Space Flight Ctr. (United States)
Mark F. Smith, NASA Goddard Space Flight Ctr. (United States)
Thomas S. Stephen, Univ. of Denver (United States)

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