New modular implementation of 2D large-signal code and its application to the modeling of wide class of TWT amplifiers

We report on the extension and further generalization of two different large-signal models suitable for the 2D modeling of TWTs based on different types of slow-wave structures. The initial implementation of the 2D large-signal codes TESLA-CC and TESLA-FW has been generalized in such way to create a single algorithm with modular extensions that can be applied to the modeling of coupled-cavity or serpentine/folded-waveguide types of slow-wave structures. This new modular code is called TESLA-TWT and, in general, it can be extended in the future to support other types of the slow-wave structures. As a next step, TESLA-TWT has been extended for parallel operation, which makes it perfectly applicable to the modeling of “hybrid” multi-stage devices.