Simulation of microwave devices with external cavities using MAGY

The simulation code MAGY developed at the University of Maryland and Naval Research Laboratory is able to describe the self-consistent nonlinear interaction between the electromagnetic fields of simply connected axisymmetric structures and electron beams. The code has been used effectively primarily for the design and simulation of gyro-devices. The main advantage of the MAGY code is its capability to find both steady state and slowly evolving dynamic solutions with minimal computational effort. The goal of the present work is to develop the formulation to be capable to model vacuum electronic devices with external cavities while keeping all the useful features of the MAGY code.