The electron emission mechanism of barium tungsten cathode is affected by temperature. Temperature changes can affect the electron emission properties of the cathode surface, thereby affecting the overall electron emission performance. Here are some areas where temperature affects:
Electron barrier: The electron emission of the barium tungsten cathode is achieved by overcoming the electron barrier on the tungsten surface. As the temperature increases, the electron barrier of the tungsten material may change, resulting in a change in the energy requirement for electron emission.
Pyroelectrons: Under high temperature conditions, pyroelectrons, electrons generated by thermal energy, may be generated on the surface of the cathode. These pyroelectrons may interfere with the electron emission process of the cathode and affect the stability of emission.
Material expansion: As the temperature increases, the material may expand, which may affect the morphology and structure of the cathode surface. This may affect the uniformity and intensity of electron emission.
Gas evolution: At high temperatures, gas may be evolved from the surface of the material, which may affect the purity and electron emission characteristics of the cathode surface.
Heat loss: In a high-temperature environment, the cathode may cause material loss due to heat loss, thereby affecting electron emission performance.
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