Abstract: An electron gun includes the following: a primary thermionic electron source, a secondary thermionic electron source and a focusing electrode disposed within a first housing that includes one or more reference members adjustably attached to a housing support connected to a first platform; an anode and one or more focusing coils disposed within a second housing comprising one or more insulating members adjustably connected to the first platform; and one or more deflection coils disposed within a third housing connected to the second housing and located opposite said first housing.

Abstract: Systems and methods are described that monitor electron beam current and voltage. The systems and methods react to fault conditions such as arcing experienced during evaporation and deposition processes to shutdown and protect associated power supply equipment. The systems and methods may provide online beam current control to provide stable operation of e-beam guns during heating and melting modes of operation.