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Physical Processes in the L Cathode

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2 Author(s)
Schaefer, D.L. ; General Electric Company, Tube Department, Schenectady, New York ; White, John E.

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The activity of this barium‐on‐tungsten cathode is maintained by dispensing barium from a pellet of barium compound. The dispensing mechanism is shown to be controlled by surface diffusion of barium over tungsten. Despite incomplete coverage of the emitting surface with barium, and almost complete absence of streaming of active material out through pores in the surface material, evaporation of barium is sufficient to be of concern in certain applications.

Published in:

Journal of Applied Physics  (Volume:23 ,  Issue: 6 )

Date of Publication:

Jun 1952

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