Propagation of wiggler focused relativistic sheet electron beams

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Title: Propagation of wiggler focused relativistic sheet electron beams
Author: Booske, J.; Destler, William; Segalov, Z.; Radack, D.; Rosenbury, E.; Rodgers, J.; Antonsen, T.; Granatstein, V.; Mayergoyz, I.
Abstract: 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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Date: 1988-02-09

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