Nonlinear theory of coherent fast wave radiation from spatiotemporally modulated gyrating electron beams

A. K. Ganguly

doi:10.1117/12.2298276

14 December 1992 Nonlinear theory of coherent fast wave radiation from spatiotemporally modulated gyrating electron beams

A. K. Ganguly

Author Affiliations +

Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19294F (1992) https://doi.org/10.1117/12.2298276
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States

Abstract

A multi-mode nonlinear analysis and particle simulation code is developed to analyze the generation of radiation at a harmonic of the rotation frequency for a spatiotemporally modulated gyrating electron beam in a cylindrical waveguide. For a device employing 150 kV, 6.7 A cold beam and a 18.8 GHz pump, nonlinear simulations show a 5th harmonic conversion efficiency of 55% at 94 GHz in a linearly tapered magnetic field. A nonlinear magnetic field taper which preserves exact phase matching gives an efficiency of 70%. The efficiency is not sensitive to axial velocity spread.

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A. K. Ganguly "Nonlinear theory of coherent fast wave radiation from spatiotemporally modulated gyrating electron beams", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19294F (14 December 1992); https://doi.org/10.1117/12.2298276

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