Research Papers in Physics and Astronomy


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Published in REVIEW OF SCIENTIFIC INSTRUMENTS, VOLUME 72, NUMBER 7, JULY 2001. Copyright © 2001 American Institute of Physics. Used by permission.


Using the computer program SIMION 6, we have studied the effects of spurious insulator charging on the trajectories of electrons through electrostatic tube lenses. We considered lens elements with flat ends, spaced a distance g apart, whose inner diameter D=10g. For the standard cases of drift tubes, two-element lenses, and einzel lenses, we found that charging effects are eliminated if t/g>3.5, where t is the distance between the lens inner diameter and the charged spacing insulator.

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