AN ANALYSIS OF ELECTRON GUNS FOR WELDING

Results from numerical experiments and direct measurements for the ana lysis of an axially symmetric triode electron gun with thermionic cath ode for electron beam welding are presented and discussed. Computer si mulation is carried out using the new version of the GUN-EBT software package. The self-consistent model takes into account the energy spect rum of emitted electrons and formation of a potential minimum in front of the cathode. The method underlying the investigation incorporates not only the commonly used trajectory analysis (ray tracing) but also an analysis in the phase space (phase analysis) which allows the emitt ance of the beans to be evaluated. It is demonstrated that computer si mulation of beam formation provides ample information for the assessme nt both of the quality of generated beams and operational performance of the guns.