Periodic magnetic focusing of sheet electron beams
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Date
1994-05Author
Booske, J.
Basten, M.
Kumbasar, A.
Antonsen, T.
Bidwell, S.
Carmel, Y.
Destler, William
Granatstein, V.
Radack, D.
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Show full item recordAbstract
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.
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