Travelling-Wave-Tube Computer Simulation: Three-Dimensional Space-Charge-Fields Computing

A set of formula to compute three-dimensional space-charge fields is presented,to have a 3D-nonlinear-numerical simulation for beam-wave interaction of TWT, in which two speed-optimization approches are used to reduce computing time to three days on an ordinary microcomputer. Preliminary computational results indicate,for the periodic magnetic focusing fields, under the given parameters,the saturation length is 9.28,the gain achieves 34.810,the RF wave amplitude achieves 1.238.