Abstract
Some time ago I proposed a magnetron of special design as a divergent lens for electron beams1. It now appears that the same device may become useful as a very powerful concentrating lens for positive ions, particularly for ion beams of extreme energy.
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References
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GABOR, D. A Space-Charge Lens for the Focusing of Ion Beams. Nature 160, 89–90 (1947). https://doi.org/10.1038/160089b0
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DOI: https://doi.org/10.1038/160089b0
