High current density — Long life cathodes for high frequency applications

Author

Ives, R.Lawrence ; Falce, Louis R. ; Collins, George ; Marsden, David ; Miram, George ; Schwartzkopf, Steve ; Smith, Bryan ; Witherspoon, Ron

Author_Institution

Calabazas Creek Res., San Mateo, CA, USA

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

Sintered tungsten wire cathodes offer the promise of high current density operation with very long life time. The fabrication technique provides controlled porosity for diffusion of barium and oxygen to the emission surface for work function reduction. The diffusion rate can be controlled depending on the current emission density requirement. The barium mixture is contained in a reservoir to provide extremely long lifetimes. This presentation will review the fabrication process and present the latest test results.

Keywords

cathodes; barium diffusion; current emission density requirement; fabrication technique; high current density; high frequency applications; long life cathodes; oxygen diffusion; sintered tungsten wire cathodes; work function reduction; Assembly; Barium; Cathodes; Current density; Fabrication; Frequency; Life testing; Reservoirs; Tungsten; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on

Conference_Location

Busan

Print_ISBN

978-1-4244-5416-7

Electronic_ISBN

978-1-4244-5417-4

Type

conf

DOI

10.1109/ICIMW.2009.5324740

Filename

5324740