The surface morphology of the barium tungsten cathode can have an impact on its performance, especially in terms of electron emission. The morphology and properties of the cathode surface directly affect the efficiency, stability, and uniformity of electron emission. The following are the effects of some surface morphology on the performance of barium tungsten cathodes:
Roughness and Surface Imperfections: Roughness and imperfections on the surface of the cathode can affect the ability of electrons to be emitted from the surface. Smoother surfaces generally help improve electron emission efficiency, while rough surfaces may cause electron beam scattering and erratic emission.
Crystal Structure: The crystal structure of the barium tungsten cathode also affects electron emission. High-quality crystal structure helps to provide more stable and uniform electron emission.
Coating and cladding: The barium tungsten cathode may be coated or clad on the surface to improve its electron emission performance. The coating can reduce the surface work function and improve the electron emission efficiency.
Purity and Impurities: The purity and impurity content of the cathode surface can affect the stability of electron emission. Impurities and impure substances can cause changes in surface energy levels, thereby affecting electron emission.
Electron escape angle: The morphology of the cathode surface can also affect the electron escape angle. Different escape angles can lead to focusing and dispersion of the electron beam.
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