Design of an electron beam generator

The main item of any EB system is the generator, whose basic design is similar to that of a tube in a television set. The most important subassemblies are:

Beam head

This contains an insulator, which is equipped with a high voltage cable connector. The so-called beam generating system, which consists of the cathode, bias cup and the anode, is integrated in the insulator.

Column valve

This subassembly contains the connection for a vacuum system that is required for the EB generator, the column valve, which separates the beam generating system from the chamber by means of a vacuum.

Viewing system

Amongst other purposes, the viewing system is used to adjust the beam’s focus point on the work piece in the chamber. Furthermore, the welding process inside the chamber can be watched. Whereas telescopic systems were previously used, camera systems are mainly employed now. Electron optical viewing systems are the most up-to-date development.

Electromagnetic system

The electromagnetic lens for beam focusing, as well as the deflection system are housed in this section

Electron beam generator with bend

Electron beam generator