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Electron emission from geometrically complex thermionic cathodes

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1 Author(s)
Lockwood, D.L. ; EG&G Optoelectron., Salem, MA, USA

Summary form only given. A simple method has been developed for analysis of the emission properties of geometrically complex cathodes. The technique is based on the assumption that current from a portion of the cathode surface is space charge limited with the balance being temperature limited. A model for total diode current was created that permits calculation of cathode properties from experimental data. An experiment was run in which the voltage on a charged capacitor was switched across a diode containing a complex finned cathode. Diode current and voltage were measured as a function of time with a high speed digitizer. These tests were repeated for a range of applied voltages and cathode temperatures. Current-vs-voltage data obtained from these measurements were fitted to the model using non-linear regression. The data were found to conform well to the model, showing that 64% of the cathode area was temperature limited at the maximum diode voltage.

Published in:

Plasma Science, 1998. 25th Anniversary. IEEE Conference Record - Abstracts. 1998 IEEE International on

Date of Conference:

1-4 June 1998