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Improved performance of the dispenser cathode with a Re intermediate layer

Li Yu-Tao Zhang Hong-Lai Liu Pu-Kun Zhang Ming-Chen

Improved performance of the dispenser cathode with a Re intermediate layer

Li Yu-Tao, Zhang Hong-Lai, Liu Pu-Kun, Zhang Ming-Chen
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  • Abstract views:  3162
  • PDF Downloads:  1058
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Publishing process
  • Received Date:  04 April 2006
  • Accepted Date:  28 July 2006
  • Published Online:  20 December 2006

Improved performance of the dispenser cathode with a Re intermediate layer

  • 1. 中国科学院电子学研究所,北京 100080

Abstract: A new type dispenser cathode with Os-W/Re dual-layer has been developed. Emission performance and surface microstructure of the cathode with the dual-layer before and after ageing were studied. The performance of the dispenser cathode is improved by introducing a Re intermediate leyer. DC current density of the dispenser cathodes coated with Os-W alloy and Os-W/Re were compared. It is found that the cathode with Os-W/Re shows better emission performance than the cathode with Os-W alloy. Both cathodes were investigated using X-ray photoelectron spectroscopy after full activation. Ternary alloy coating being formed for the cathode with Os-W/Re is the major reason for its better emission performance. Scanning electron microscopy was used for investigating surface microstructures of both kinds of cathodes and the results show that the emitting surface of the cathode with Os-W alloy after ageing appeared non-adherent (flaking) in localized areas. This is one of the reasons for its non-uniform emission. However, surface of the cathode with Os-W/Re does not suffer from peeling under the same conditions, thus ensuring better emission uniformity and functional reliability of the dispenser cathode.

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