Title :
A new dispenser cathode with dual-layer
Author :
Li, Yutao ; Zhang, Honglai ; Liu, Pukun ; Zhang, Mingchen
Author_Institution :
Inst. of Electron., Chinese Acad. of Sci., Beijing, China
Abstract :
The emission and surface characteristics of the dispenser cathode coated with Os-W alloy and that coated with Os-W/Re are studied and compared. The dispenser cathode coated with Os-W/Re has applied in electron gun measurement system for making measurement of higher emission current and life test. It is found that the dispenser cathode coated with Os-W/Re has higher current density than that coated only with Os-W alloy. In electron gun the dispenser cathode coated with Os-W/Re has pulse current density of 30 A/cm2 and life of more than 800 hours.
Keywords :
coatings; electron guns; osmium; rhenium; thermionic cathodes; thermionic emission; tungsten; Os-W; Os-W-Re; dispenser cathode; electron gun measurement system; emission characteristics; emission current; life test; surface characteristics; Atomic measurements; Cathodes; Coatings; Current density; Current measurement; Electron emission; Life testing; System testing; Temperature; Tungsten;
Conference_Titel :
Vacuum Electron Sources Conference, 2004. Proceedings. IVESC 2004. The 5th International
Print_ISBN :
0-7803-8437-7
DOI :
10.1109/IVESC.2004.1414202
