E B Gun Cathode assembly

The Cathode Assembly of an Electron Beam Gun (EB Gun) is a critical component responsible for emitting the electrons that form the electron beam. Typically, it consists of a cathode filament, which is heated to release electrons through thermionic emission. The heated filament is usually made from a high-melting-point material such as tungsten or a tungsten alloy, due to its ability to withstand the high temperatures generated during the emission process. The cathode assembly is positioned within a vacuum chamber to maintain the proper environment for electron generation and to prevent unwanted collisions with gas molecules.