Three-dimensional theory of helix TWTs: models and applications

Summary form only given, as follows. A variety of 3D configurations for modeling helix TWTs is presented. Linear field theories are described for the dispersion equations for helix TWTs. These models include a sheath helix enclosed by a conducting shell with dielectric and vane loading in the gap between the helix and the shell. The dispersion equations so obtained are solved for parameters consistent with several experiments and compared with measured results. Good agreement for the dispersion and gain is found with the linear theories and the experiments. The nonlinear analysis and simulation code is an extension of the GATOR simulation to include the vanes and dielectrics. Comparisons between GATOR and the linear theories as well as the experiments are presented, and good agreement is found.