Genesis Solar Wind Concentrator: Computer Simulations of Performance Under Solar Wind Conditions |
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Authors: | Wiens Roger C Neugebauer Marcia Reisenfeld Daniel B Moses Ronald W Nordholt Jane E Burnett Donald S |
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Institution: | (1) Los Alamos National Laboratory, Space & Atmospheric Sciences, NIS-1, MS D466;(2) Jet Propulsion Laboratory, MS 169-506, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;(3) Theoretical Division, Los Alamos National Laboratory, T-3, MS B216;(4) P-21, MS D454, USA;(5) California Institute of Technology, 1201 E. California Boulevard, Pasadena, CA 91125, USA |
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Abstract: | The design and operation of the Genesis Solar-Wind Concentrator relies heavily on computer simulations. The computer model
is described here, as well as the solar wind conditions used as simulation inputs, including oxygen charge state, velocity,
thermal, and angular distributions. The simulation included effects such as ion backscattering losses, which also affect the
mass fractionation of the instrument. Calculations were performed for oxygen, the principal element of interest, as well as
for H and He. Ion fluences and oxygen mass fractionation are determined as a function of radius on the target. The results
were used to verify that the instrument was indeed meeting its requirements, and will help prepare for distribution of the
target samples upon return of the instrument to earth. The actual instrumental fractionation will be determined at that time
by comparing solar-wind neon isotope ratios measured in passive collectors with neon in the Concentrator target, and by using
a model similar to the one described here to extrapolate the instrumental fractionation to oxygen isotopes.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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