Title :
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
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;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2010 IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-7098-3
DOI :
10.1109/IVELEC.2010.5503378
