MODELING AND SIMULATION OF BEAM FORMATION IN ELECTRON GUNS

This paper describes a new PC version of the software package GUN-EBT for computer simulation of beam formation in rotationally symmetric el ectron guns with thermionic cathodes. It is based on a self-consistent physical model which takes into account the beam space charge and the initial velocities effects. The theoretical framework used for both t he formulation of the model and for the interpretation of the results of numerical experiments is the formalism of the charged particle dyna mics in phase space, This enables not only a trajectory analysis (ray tracing) but also a phase-space analysis of beams to be performed. The package can be used as an effective tool for computer aided design an d optimization of electron guns in various electron-optical systems. T he operation of the package is illustrated with a typical example.