Self-consistent nonlinear theory of the resistive-wall klystron

Han Sup Uhm

doi:10.1117/12.175772

13 May 1994 Self-consistent nonlinear theory of the resistive-wall klystron

Han Sup Uhm

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175772
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

A self-consistent nonlinear theory of resistive-wall instability is developed for a relativistic electron beam propagating through a grounded cylindrical resistive tube. Because of the self- excitation of the space charge waves by the resistive-wall instability, a highly nonlinear current modulation of the electron beam is accomplished as the beam propagates downstream. A partial integrodifferential equation is obtained in terms of the initial energy modulation ((epsilon) ), the self-field effects (h), and the resistive-wall effects ((kappa) ). Analytically investigating the partial integrodifferential equation, a scaling law of the propagation distance z_m at which the maximum current modulation occurs is obtained. It is found in general that the self-field effects dominate over the resistive-wall effects at the beginning of the propagation. As the beam propagates further downstream, the resistive-wall effects dominate. Due to a relatively large growth rate of the instability, the required tube length of the klystron is short for most applications.

Citation Download Citation

Han Sup Uhm "Self-consistent nonlinear theory of the resistive-wall klystron", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175772

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