P3-37: Emission characteristics of Sc- doped dispenser cathodes in electron gun open structures

Author

Liu, Wei ; Wang, Yiman ; Zhao, Lei ; Li, Lili ; Zhang, Xizhu ; Wang, Jinshu

Author_Institution

Sch. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing, China

fYear

2010

fDate

18-20 May 2010

Firstpage

403

Lastpage

404

Abstract

Emission properties of Scandia Doped Dispenser (SDD) cathodes tested in Pierce Gun open structures have been reported in this paper. 80-100 A/cm² Space-Charge Limited (SCL) current densities have been obtained at designed anode voltages and normal operating temperatures for cathodes with either flat surfaces or concave surfaces. The influences of anode effects on cathodes, which appear in close-spaced diodes, are discussed in the paper.

Keywords

anodes; cathodes; current density; electron emission; electron guns; space charge; Pierce gun open structure; Sc-doped dispenser cathode; anode effect; anode voltage; close-spaced diode; concave surface; electron gun open structure; emission characteristics; emission property; flat surface; scandia doped dispenser cathode; space-charge limited current density; Anodes; Cathodes; Current density; Electron emission; Electron guns; Pulse measurements; Surface cleaning; Temperature; Testing; Voltage; Pierce electron gun; scandate cathode; thermionic emission; vacuum electron devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2010 IEEE International

Conference_Location

Monterey, CA

Print_ISBN

978-1-4244-7098-3

Type

conf

DOI

10.1109/IVELEC.2010.5503378

Filename

5503378