Theoretical and computational characterization of multi-tone helix traveling wave tubes

Summary form only given, as follows. Initial results are presented for theoretical characterization of multi-tone, helix traveling wave tubes (TWT). The goal of this effort is to determine techniques for supression of intermodulation and harmonic effects between multiple signals operating within a given band and somewhat below saturation. This will be done by developing tools for simulating TWT operation including non-linear effects and saturation characteristics. The results presented here obtain the vacuum dispersion relations and an analysis of reactive loading of the helix. Linear gain characteristics are also presented using a model which treats a circular electron beam as a uniform bounded plasma. Plans for development of advanced computational models are discussed. Preliminary comparisons with experimental results and comparisons of benchmark results with existing codes will be presented.