Title :
Failure analysis of TWT cathodes
Author :
Haas, G.A. ; Gray, H.F. ; Thomas, R.E.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
Abstract :
Impregnated matrix cathodes have been observed to fail unexpectedly in initial phases of life due to poisoning. They have similarly been found to give abnormally delayed response when rapid turn-on performance is required. Loss of emission with life is also a problem. Analytical studies of the surface properties of some of these cathodes have been initiated using combined Scanning Low Energy Electron Probe (SLEEP) techniques for measuring work function variations and Auger Electron Spectroscopy (AES) techniques for determining surface atomic composition. The correlation between the electronic and atomic surface properties as applied to some of the above mentioned cathode failures will be given here.
Keywords :
cathodes; electron probes; failure analysis; travelling wave tubes; SLEEP techniques; TWT cathodes; atomic surface property; cathode failures; emission loss; failure analysis; impregnated matrix cathodes; scanning low energy electron probe; surface atomic composition; Anodes; Barium; Cathodes; Face; Pollution measurement; Surface treatment; Thickness measurement;
Conference_Titel :
Electron Devices Meeting (IEDM), 1974 International
Conference_Location :
Washington, DC
DOI :
10.1109/IEDM.1974.6219648
