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Emission and surface characteristic of ternary alloy Ir/Re/W coated impregnated tungsten cathodes

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4 Author(s)
Honglai Zhang ; Inst. of Electron., Chinese Acad. of Sci., Beijing, China ; Yanwen Liu ; Mingchen Zhang ; Yutao Li

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.

Published in:

Vacuum Electron Sources Conference, 2004. Proceedings. IVESC 2004. The 5th International

Date of Conference:

6-10 Sept. 2004