Experimental and numerical studies of sheet electron beam propagation through a planar wiggler magnet
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Date
1993-12Author
Zhang, Ze-Xiang
Granatstein, Victor
Destler, William
Bidwell, Steven
Rodgers, J.
Cheng, S.
Antonsen, T.
Levush, B.
Radack, D.
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Show full item recordAbstract
Detailed experimental studies on sheet relativistic
electron beam propagation through a long planar wiggler are
reported and compared with numerical simulations. The planar
wiggler has 56 periods with a period of 9.6 mm. Typically, the
wiggler field peak amplitude is 5 kG. The experimental efforts
have been focused on control of the deviation of the beam toward
the side edge of the planar wiggler along the wide transverse
direction. It is found that a suitably tapered magnetic
field configuration at the wiggler entrance can considerably reduce
the rate of the deviation. The effects of the following techniques
on beam transport efficiency are also discussed: side focusing,
beam transverse velocity tuning at the wiggler entrance,
and beam spread limiting. High beam transport efficiency (almost
100%) of a 15 A beam has been obtained in some cases.
The results are relevant to development of a free electron laser
amplifier for application to stabilizing and heating of plasma in
magnetic fusion research.
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