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  • Research of Methods to Improve the Emission Properties of Dispenser Tungsten-Aluminate Cathodes by Metal Deposition

Research of Methods to Improve the Emission Properties of Dispenser Tungsten-Aluminate Cathodes by Metal Deposition

Student: Gorelova Ekaterina

Supervisor: Gennady Bondarenko

Faculty: HSE Tikhonov Moscow Institute of Electronics and Mathematics (MIEM HSE)

Educational Programme: Applied Physics (Master)

Year of Graduation: 2017

In this paper, we summarize the results of studying the effect of depositing an osmium film on the working surface of a metal-porous cathode on its emissivity. The main attention was directed to the study of the microstructure of a standard metal-porous cathode and a cathode coated with an osmium film. The aim of the work is to improve the technology of depositing an osmium film on the surface of a metal cathode and to study the effect of this film on its emission properties. In the course of the work, the structure of the osmium film has been investigated, as well as the mechanism of its growth on a metal-porous cathode.To determine the emission parameters, an experimental diode has been made. Emission parameters were estimated for standard cathodes and cathodes coated with an osmium film using the method of the underheating characteristics. It has been found that cathodes with an osmium film with a thickness of 0.4-0.6 μm have a longer durability and a more uniform distribution of the emission flux over the surface as compared to a standard metal-porous cathode.

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