Volume 43 Issue 1
Jan.  2023
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Article Navigation >  Chinese Journal of Space Science  > 2023  >  43(1): 137-143 Open Access
LI Fan, CAO Yang, MOU Huan, LIU Yaning, LI Haitao, LI Baoquan. Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire (in Chinese). Chinese Journal of Space Science, 2023, 43(1): 137-143 doi: 10.11728/cjss2023.01.211124122
Citation: LI Fan, CAO Yang, MOU Huan, LIU Yaning, LI Haitao, LI Baoquan. Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire (in Chinese). Chinese Journal of Space Science, 2023, 43(1): 137-143 doi: 10.11728/cjss2023.01.211124122
shu

Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire

doi: 10.11728/cjss2023.01.211124122 cstr: 32142.14.cjss2023.01.211124122
  • 1.

    National Space Science Center, Chinese Academy of Sciences, Beijing 100190

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049

  • Received Date: 2021-11-24
  • Accepted Date: 2022-04-15
  • Rev Recd Date: 2022-05-06
    • Available Online: 2022-11-03
    Abstract
  • In-situ measurement of planetary rock composition is the basic requirement of planetary exploration, and X-ray fluorescence analysis is an important technical means to carry out elemental composition measurement. In order to meet the needs of X-ray fluorescence analyzer for deep space detection, a miniature X-ray closed tube with micro-focal spot is designed and developed. It size is Φ15 mm×22 mm, and the focal spot size is 230 μm. The anode is grounded in operation, and the cathode is connected to the floating negative high voltage with the maximum voltage of –50 kV. In this paper, the differences of electron emission of common hot cathodes such as spiral tungsten, linear tungsten and linear rhenium tungsten hot cathodes, are studied in detail, and the electron emission efficiency of each hot cathode is measured. The test results show that the maximum electron emission efficiency of linear rhenium tungsten wire is 27.87 μA·W–1 at 200 V anode voltage, which is 4 times that of spiral tungsten wire and 9 times that of linear tungsten wire. In addition, rhenium tungsten wire has the characteristics of fast electron emission, low preheating requirement and low vacuum requirement, so it is an ideal choice for X-ray closed tube cathode wire for deep space exploration.

     

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