TWT Model on a Metamagnetic Plate

A model of the traveling-wave tube (TWT) that includes a magnetic plate with increased permeability and a metal screen parallel to the plate is considered. The dispersion equation in the presence of a homogeneous electron beam (e-beam) filling the space between the plate and the screen is derived. The method of differentiation of the dispersion equation in the presence of the e-beam is used to calculate coupling and depression coefficients, entering the TWT characteristic (determinantal) equation. The considered model is compared with a similar model on a dielectric plate and “impedance” comb model. Conclusions concerning the prospects of development of such a “magnetic” TWT are drawn.