Abstract
The design of multiple-sector isotope-ratio mass spectrometers has been investigated for the purpose of improving ion transmission efficiency while maintaining high abundance sensitivity. Various magnet geometries with normal and non-normal field boundaries were examined. The most favorable geometry found for tandem 90°-deflection magnets has boundaries 17° off-normal and drift lengths 1.44 times the radius of deflection. The ion beam is rendered parallel in the vertical plane at the focus of the first magnet and is brought to a stigmatic focus by the second magnet. This geometry and gives 100% transmission without the need for intermediate focusing lesnes. Complete transmission is also maintained with the addition of a cylindrical electric sector as a third stage for greater abundance sensitivity.
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