The barium tungsten emitter hollow cathode is a special cathode structure that combines the characteristics of a barium tungsten emitter and a hollow cathode.
First, a barium tungsten emitter refers to a method of storing active substances such as barium salts in a tungsten sponge by utilizing the porous properties of the tungsten matrix. Under working conditions, these active substances react with the tungsten matrix to generate free barium atoms, which diffuse to the cathode surface to form a stable, low work function emission layer, thereby providing efficient electron emission.
The hollow cathode is a special cathode design with a hollow structure inside, usually containing one or more small holes or gaps. This design enables the hollow cathode to produce higher electron emission density and current density at a lower operating voltage.
The barium tungsten emitter hollow cathode combines the advantages of these two technologies. Its internal hollow structure helps to increase the surface area and porosity of the cathode, thereby accommodating more active substances. At the same time, the use of barium tungsten emitters enables the cathode to have higher electron emission efficiency and longer service life.
In applications, barium tungsten emitter hollow cathodes are widely used in various vacuum electronic devices, such as microwave tubes, klystrons, traveling wave tubes, etc. These devices require stable and efficient electron emission sources to generate high-frequency electromagnetic waves or particle beams, and barium tungsten emitter hollow cathodes are the ideal choice to meet these needs.
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