PMID: 15244755Jul 13, 2004Paper

Mechanisms for phase distortion in a traveling wave tube

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
J G Wöhlbier, J H Booske

Abstract

We present a view of the physics of phase distortion in a traveling wave tube (TWT) based on unique insights afforded by the MUSE models of a TWT [IEEE Trans. Plasma Sci. 30, 1063 (2002)]]. The conclusion, supported by analytic theory and simulations, is that prior to gain compression phase distortion is due to harmonic frequencies in the electron beam and the resulting "intermodulation" frequency at the fundamental, and not the often cited "slowing down of electrons in the electron beam." We draw these conclusions based on MUSE simulations that allow explicit control of electron beam frequency content, an analytic solution to the S-MUSE model [IEEE Trans. Plasma Sci. 30, 1063 (2002)]] that reveals that phase distortion is due to the fact that the fundamental frequency is an intermodulation product of itself, and large signal LATTE [IEEE Trans. Plasma Sci. 30, 1063 (2002)]] simulations that are modified to remove the effect of the slowing down of electrons in the electron beam. As applications of the theory we compare S-MUSE simulations to an amplitude phase model using the analytic phase transfer curve, we study dependence of phase distortion on circuit dispersion and electron beam parameters at the second harmonic with large ...Continue Reading

References

Jan 7, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·John G WöhlbierAnd John H Booske

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