An einzel lens with a diagonal-slit central electrode to combine steering and focusing of a low energy ion beam

preprint2010arXivOpen access

Abstract

In many applications of the simple three-element einzel lens, such as injecting a low energy ion beam into a high-field Penning trap, there is a need for small-angle steering as well as focusing of the beam. We have analyzed a diagonalslit cylinder serving as the middle electrode of such a lens and have shown that such an electrode configuration significantly diminishes the aberration associated with such a deflection.

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