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Proceedings Paper

Analysis And Nonlinear Simulation Of Quadrupole And Dipole Wiggler Fels For Millimeter Waves
Author(s): J. E. Scharer; S. F. Chang; O. C. Eldridge
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Paper Abstract

An FEL amplifier with a helical quadrupole wiggler is investigated analytically and numerically. A 3-D simulation code is utilized to examine the nonlinear evolution of circular waveguide modes as well as the characteristics of relativistic particle motion, which illustrate a strong focussing effect. The simulation predicts a 0.55 dB/cm gain, 2% efficiency, and 8% bandwidth for the optimum TE21 mode at 300 GHz for an untapered wiggler. Mode competition for an over-moded waveguide and a nonlinear wiggler taper for efficiency enhancement are examined for a linear dipole wiggler in a rectangular guide. It is found that the maximum TEoi mode efficiency is 53% at 280 GHz and that the TM21 mode power can be as high as 28% in the uniform wiggler region.

Paper Details

Date Published: 18 November 1989
PDF: 1 pages
Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); doi: 10.1117/12.978322
Show Author Affiliations
J. E. Scharer, University of Wisconsin-Madison (United States)
S. F. Chang, University of Wisconsin-Madison (United States)
O. C. Eldridge, University of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 1039:
13th Intl Conf on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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