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High emission performance impregnated dispenser cathode

  • Published:
Journal of Electronics (China)

Abstract

In order to obtain higher emission performance than that of a traditional M-type cathode, we have developed a new type impregnated dispenser cathode. The new cathode is impregnated with a new active substance with molar ratio of 26BaO·29SrO·8Sc2O3·7CaO·Al2O3. This paper introduces the emission performance, surface active material, and work function of the new cathode. At 1100 °CB, the DC current density and pulse current density are 30.6±1.0 A/cm2 and 171.6±2.8 A/cm2, respectively, 2.1 and 5.4 times of that of an M-type cathode. The work function of the new cathode is 1.668±0.002 eV. High concentration O-Al-Sc-Sr-Ba and O-Al-Sc-Ba are found in the pores and at pore edges, respectively. By comparing the emission performances and surface characteristics of as-polished and ascleaned cathodes, it is proposed that, the emission around pore ends forms the major part of the total emission for the new cathodes.

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Authors and Affiliations

  1. Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing, 100190, China

    Shengyi Yin, Qiang Zheng & Yu Wang

  2. University of Chinese Academy of Sciences, Beijing, 100039, China

    Zhen Peng

  3. No. 19, North 4th Ring Road West, Haidian District, Beijing, 100190, China

    Shengyi Yin

Authors
  1. Shengyi Yin
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  2. Zhen Peng
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  3. Qiang Zheng
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  4. Yu Wang
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Corresponding author

Correspondence to Shengyi Yin.

Additional information

Supported by the National Natural Science Foundation of China (No. 60871053) and the Major State Basic Research Development Program of China (No. 2013CB328901).

Communication author: Yin Shengyi, born in 1964, male, Doctor of Engineering.

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Yin, S., Peng, Z., Zheng, Q. et al. High emission performance impregnated dispenser cathode. J. Electron.(China) 30, 417–422 (2013). https://doi.org/10.1007/s11767-013-3065-7

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  • DOI: https://doi.org/10.1007/s11767-013-3065-7

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