Title :
Emission and surface characteristic of ternary alloy Ir/Re/W coated impregnated tungsten cathodes
Author :
Zhang, Honglai ; Liu, Yanwen ; Zhang, Mingchen ; Li, Yutao
Author_Institution :
Inst. of Electron., Chinese Acad. of Sci., Beijing, China
Abstract :
In order to improve the activation characteristics & emission ability of the conventional Ir-Coated impregnated tungsten cathodes, a new type of dispenser cathode with ternary alloy Ir/Re/W coating was developed. The improved cathodes show higher emission current density and faster activation characteristics than that of the conventional pure Ir-coated impregnated tungsten cathodes. XPS was used to analyze the element compositions on the surface of the cathodes coated with pure Ir and Ir/Re/W alloy. The results will be given in this paper.
Keywords :
cathodes; iridium alloys; tungsten; Ir-Re-W; Ir-coated impregnated tungsten cathodes; activation characteristics; dispenser cathode; emission ability; emission current density; surface characteristic; ternary alloy Ir/Re/W coating; ternary alloy coated impregnated tungsten cathodes; Aging; Anodes; Cathodes; Coatings; Current density; Electron emission; Silicon alloys; Sputtering; 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.2004.1414135
