Computer Science – Performance
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.v43j..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #V43J-04
Computer Science
Performance
[1041] Geochemistry / Stable Isotope Geochemistry, [1094] Geochemistry / Instruments And Techniques, [5455] Planetary Sciences: Solid Surface Planets / Origin And Evolution, [6240] Planetary Sciences: Solar System Objects / Meteorites And Tektites
Scientific paper
The Genesis Discovery Mission captured small amounts of the solar wind in the near-surfaces of ultra-pure target materials and returned them to Earth for laboratory analysis. At UCLA, we have designed and constructed a new hybrid instrument, called the “MegaSIMS”, specifically to tackle the unique analytical challenges posed by the Genesis samples: dilute elemental concentrations which vary with depth, limited sample material, and close proximity of surface contamination to the implanted solar wind ions. The MegaSIMS combines a modified low-energy (10keV) ion microscope with a compact tandem accelerator mass spectrometer (1.2 MV terminal) equipped with a novel injection system that allows for simultaneous analysis of several ion beams of adjacent masses (e.g., 16-17-18 or 26-27). This is achieved by an ‘isotope recombinator’, which can also be operated in an ion microscope mode. Up to five masses, free of molecular ion interferences, can be detected in parallel by simultaneous ion counting in a forward-geometry double focusing, high energy mass spectrometer. In celebration of the 35th anniversary of the construction of the first commercially successful ion microscope, the CAMECA ims 3f, and of the 70th anniversary of one of the pioneers who made this instrument successful and scientifically important, Nobu Shimizu, we will describe the performance characteristics of the MegaSIMS as a new tool for cosmochemistry and geochemistry. The first experiments completed with the MegaSIMS show that the Sun is enriched in oxygen-16 by at least 5% relative to Earth and meteorites. Implications of these results and prospects for future work will be presented.
Burnett Don S.
Coath Christopher D.
Heber Veronika S.
Jarzebinski G.
Kallio P. A. A.
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