N.O. Shabunin1, R.K. Yafarov2
1,2 Kotelnikov IRE of RAS (Saratov, Russia)
1,2 SSU them. N.G. Chernyshevsky (Saratov, Russia)
Formulation of the problem. One of the main requirements for EWP microwave and sub-terahertz ranges is to increase their radiant power. This is achieved by increasing the operating temperature of metal-porous thermionic cathodes (MPCs). In this case, simultaneously with an increase in the density of electron fluxes, the rate of evaporation of active impurities that make up the MPC increases. The deposition of impurities with a low work function on the grid electrode, in combination with radiation heating and current interception of electrons of the primary beam, transfers the grid to the emitting state, which negatively affects the characteristics of electrovacuum devices.
Target. Obtaining and research of low-emission carbon coatings of cathode-grid units (CGU) of high-power electrovacuum microwave devices.
Results. Abstract—Anti-emission carbon coatings with an increased work function and a low rate of thermal deposition of active impurity additives of metal-porous thermal cathodes of cathode-grid assemblies of high-power vacuum devices in the microwave and sub-terahertz ranges are obtained.
Practical significance. The developed coating will significantly increase the service life of microwave vacuum devices by slowing down the formation of stable compounds from substances thermally evaporated by MPC onto grids.
Shabunin N.O., Yafarov R.K. Dipole polarization of anti-emission coatings of high-power microwave and sub-terahertz vacuum devices. Nonlinear World. 2022. V. 20. № 3. P. 61-65. DOI: https://doi.org/10.18127/j20700970-202203-07 (In Russian)
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