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- W1969332204 abstract "The optics of a configuration consisting of a biased ion source exit canal, followed by a four-electrode electrostatic lens is investigated. This effectively operates as a five-electrode electrostatic lens (although two electrodes are in fact wired at the same potential). This lens displays three degrees of freedom in achieving a required beam focus. In particular, this lens is investigated to determine its optimal configuration for the present, low voltage ion source and its suitability for use with a high voltage field ionization ion source. The finite element method is used to calculate the electrostatic field in the lens, and optical properties are extracted from ray tracing. A full range of “accelerating” and “decelerating” focusing modes are analysed with a range of final to initial voltage ratios of between 1 and 16, and with and without a beam crossover inside the lens. It is found that aberrations are lowest for large initial acceleration, and with no beam crossover, with the optimal aberrations being relatively insensitive to the final electrode voltage. Calculations suggest, however, that the introduction of a high voltage field ionization source would almost certainly preclude the use of the optimal lens configuration in practice." @default.
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- W1969332204 date "1994-03-01" @default.
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- W1969332204 title "An investigation of the optics of a 5-element electrostatic lens for use with a high brightness ion source" @default.
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- W1969332204 doi "https://doi.org/10.1016/0168-583x(94)95347-3" @default.
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