Study of relativistic virtode in CST Particle Studio

Mechanisms leading to the microwave generation breakdown and to the corresponding microwave impulse shortening in the relativistic virtode have been investigated with the help of CST Particle Studio. It has been discovered that this breakdown is conditioned by the qualitative change of beam dynamics during the process of the suppression of generation in the system. Obtained results is principally important because it may help in the long term to solve the problem of a microwave radiation impulse lengthening and, hence, the efficiency increasing of relativistic virtode. The optimization of virtode geometrical parameters (cathode-anode distance, cathode radius, feedback window size, plunger positions et al.) was carried out with the help of CST Particle Studio optimizer in order to maximize the efficiency of the device in a single-mode regime.