Emission Characteristics of Nanosized Scandia-Doped Dispenser Cathodes in Open Electron-Gun Structures

Author

Liu, Wei ; Wang, Yiman ; Wang, Jinshu ; Wang, Yanchun ; Vancil, Bernard

Author_Institution

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

Volume

58

Issue

4

fYear

2011

fDate

4/1/2011 12:00:00 AM

Firstpage

1241

Lastpage

1246

Abstract

The emission properties of nanosized scandia-doped dispenser cathodes tested in open-structure Pierce electron guns are reported in this paper. Over 100 A/cm² and over 80 A/cm² space-charge-limited current densities have been obtained at the operating temperatures of 950 °C_b and 1025°C_b for cathodes with planar emitting surfaces and cathodes with concave emitting surfaces, respectively, at rated anode voltages.

Keywords

current density; doping; electron guns; scandium; space charge; thermionic cathodes; thermionic electron emission; JkJk:ScO₃; concave emitting surface; nanosized scandia-doped dispenser cathode; open-structure Pierce electron gun; planar emitting surface; space-charge-limited current density; temperature 1025 degC; temperature 950 degC; vacuum electron device; Anodes; Cathodes; Current density; Electron tubes; Temperature measurement; Voltage measurement; Pierce electron gun; scandate cathode; thermionic emission; vacuum electron devices (VEDs);

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2011.2105877

Filename

5729800