Mass spectrograph for imaging low-energy neutral atoms
- Lockheed Palo Alto Research Lab., Palo Alto, CA (United States)
- Univ. of Bern (Switzerland). Physikalisches Inst.
- NASA Goddard Space Flight Center, Greenbelt, MD (United States). NASA Goddard Space Flight Center
- Univ. of Denver, CO (United States). Physics Dept.
The authors 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 [approximately]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.
- OSTI ID:
- 5019883
- Journal Information:
- Optical Engineering; (United States), Vol. 33:2; ISSN 0091-3286
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
EARTH MAGNETOSPHERE
REMOTE SENSING
MEASURING INSTRUMENTS
DESIGN
DEUTERIUM
GLOBAL ASPECTS
HELIUM
HYDROGEN
OXYGEN
PLASMA DIAGNOSTICS
EARTH ATMOSPHERE
ELEMENTS
FLUIDS
GASES
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
STABLE ISOTOPES
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)