Analysis And Nonlinear Simulation Of Quadrupole And Dipole Wiggler Fels For Millimeter Waves

J. E. Scharer; S. F. Chang; O. C. Eldridge

doi:10.1117/12.978322

18 November 1989 Analysis And Nonlinear Simulation Of Quadrupole And Dipole Wiggler FELs For Millimeter Waves

J. E. Scharer, S. F. Chang, O. C. Eldridge

Proceedings Volume 1039, 13th Intl Conf on Infrared and Millimeter Waves; (1989) https://doi.org/10.1117/12.978322
Event: 13th International Conference on Infrared and Millimeter Waves, 1987, Honolulu, HI, United States

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.

Citation Download Citation

J. E. Scharer, S. F. Chang, and O. C. Eldridge "Analysis And Nonlinear Simulation Of Quadrupole And Dipole Wiggler FELs For Millimeter Waves", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); https://doi.org/10.1117/12.978322

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