Periodic magnetic focusing of sheet electron beams

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Title: Periodic magnetic focusing of sheet electron beams
Author: Booske, J.; Basten, M.; Kumbasar, A.; Antonsen, T.; Bidwell, S.; Carmel, Y.; Destler, William; Granatstein, V.; Radack, D.
Abstract: Sheet electron beams focused by periodically cusped magnetic (PCM ) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.
Description: Copyright 1994 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Phys. Plasmas 1, 1714 (1994) and may be found at (
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Date: 1994-05

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