Propagation of wiggler focused relativistic sheet electron beams
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Date
1988-02-09Author
Booske, J.
Destler, William
Segalov, Z.
Radack, D.
Rosenbury, E.
Rodgers, J.
Antonsen, T.
Granatstein, V.
Mayergoyz, I.
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Show full item recordAbstract
A recent design concept for millimeter-wave free-electron lasers [J. Appl, Phys, 60, 521
( 1986)] would require the stable propagation of a sheet electron beam through a narrow
waveguide channel. Experimental results reported in this article support the feasibility of such
a configuration by demonstrating the stable propagation of relativistic sheet electron beams
through a narrow waveguide gap (3.2 mm) using focusing by a short-period electromagnet
wiggler. 90% of the electron current in a loo-keV sheet electron beam was transmitted
through a S-cm-Iong channel with peak wiggler fields of 800 G. Almost 80% of a 400-keV
beam was similarly confined with a 16oo-G wiggler field. The data were consistent with single
electron trajectory models, indicating that space-charge effects were minimal. No evidence of
beam breakup or filamentation instabilities was observed.
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