Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nimpb..40..750y&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section B, Volume 40, p. 750-754.
Physics
2
Scientific paper
Plasmas found in the solar wind and the magnetospheres of the Earth and other planets represent formidable experimental challenges in the area of ion mass spectroscopy. Spectrometers must cope with low density (< 1 ion/cm3) high temperature plasmas (kT > 10 keV) that are highly anisotropic and heterogeneous. Ions may include singly and multiply charged atomic species such as hydrogen, helium, nitrogen, and oxygen, as well as, in the case of comets and other planets, a variety of molecular species. Calibration of space plasma mass spectrometers offers a comparable challenge: it requires an ion source and acceleration stages that will produce a uniform beam of large area (+/- 5% over ~ 20 × 20 cm), and moderate intensity (102 -109 ions/cm2s) from a wide variety of gases. Furthermore, the beam must be well coffimated (<= 0.5° FWHM) and resolved (M/ΔM > 50, E/ΔE > 200) and have a stability of +/-1% over periods > 8 h. Instruments to be calibrated are oriented in the beam using a 4 degree-of-freedom gimbal and translation system. A system which meets these requirements is currently being designed at Southwest Research Institute.
Burch James. L.
Marshall Andrew J.
Young Toby D.
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