Electron Beam Tungsten Filament

EB tungsten filament is mainly for emitting electron beams, consists of tungsten filament, thorium tungsten filament and anti-sag tungsten filament. Small size is its main property. Therein the filament is playing an important role in converting the electric power to heat after power supply and heating the cathode, then the surface of cathode will produce 600-800℃ high temperature and create an external condition for cathode electron emission. It has the following common types: mosquito type filament, no center mosquito type filament, S-type filament, half-moon shape of the filament, L door-type filament, door-type electron gun filament, double hook-type electron gun filament, straight filament type , screw-type electron gun filament, bottle-type electron gun filament, double hook gate type electron gun filament, etc. (picture attached). Different types of filament have different purposes. For example, the hollow, mosquito and gate-shaped type are often used to Japanese electronics. Besides, we should maintain the vacuum system and keep a certain humidity to prolong the filament life.

 

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