DocumentCode
3555245
Title
The M-type cathode - No longer magic?
Author
Green, M.C.
Author_Institution
Varian Associates, Inc., Palo Alto, California
fYear
1980
fDate
8-10 Dec. 1980
Firstpage
471
Lastpage
474
Abstract
Recent progress in the understanding and quantification of the surface effects occurring in M-type and mixed metal matrix cathodes is described. A new mechanism for the mode of emission enhancement in these cathodes is proposed based on chemical rather than physical effects. A correlation has been established between the formation of osmium/tungsten alloy and reduced effective work function. Using this result an improved dispenser cathode has been constructed with a work function 0.2 eV lower than conventional B-type emitters.
Keywords
Barium; Cathodes; Chemicals; Current measurement; History; Life testing; Manufacturing; Performance evaluation; Spatial resolution; Tungsten;
fLanguage
English
Publisher
ieee
Conference_Titel
Electron Devices Meeting, 1980 International
Conference_Location
Washington, DC, USA
Type
conf
DOI
10.1109/IEDM.1980.189869
Filename
1481312
Link To Document