Finite difference the oxide coated cathode for the electron gun which possesses the metal backing which is doped

摘要

The metal backing of the aforementioned cathode has the thickness of 100 millimicrons, or less contains the plural reducing agents, as Si or Al on surface 111, contains 0.005%Mg0.1%, Si or Al0.025% and W3%, on base 122, as for Mg mass concentration, Mg mass concentration with respect to the surface around under, as for Si or Al mass concentration, Si or Al mass concentration with respect to the surface around above, is higher than 0.02%. Life is converted maximally, turn on time is minimized.