Volume 43 Issue 1
Jan.  2023
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Article Navigation >  Chinese Journal of Space Science  > 2023  >  43(1): 144-155 Open Access
WU Wei, LIU Chao, ZHANG Xianguo, ZHANG Aibing, SUN Yueqiang. Research on a Low Energy Tele-focus Electron Gun (in Chinese). Chinese Journal of Space Science, 2023, 43(1): 144-155 doi: 10.11728/cjss2023.01.220208013
Citation: WU Wei, LIU Chao, ZHANG Xianguo, ZHANG Aibing, SUN Yueqiang. Research on a Low Energy Tele-focus Electron Gun (in Chinese). Chinese Journal of Space Science, 2023, 43(1): 144-155 doi: 10.11728/cjss2023.01.220208013
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Research on a Low Energy Tele-focus Electron Gun

doi: 10.11728/cjss2023.01.220208013 cstr: 32142.14.cjss2023.01.220208013
  • 1.

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

  • 2.

    School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049

  • 3.

    Beijing Key Laboratory of Space Environment Exploration, Beijing 100190

  • 4.

    Key Laboratory of Science and Technology on Space Environment Situational Awareness, Chinese Academy of Sciences, Beijing 100190

  • Received Date: 2022-01-29
  • Accepted Date: 2022-09-06
  • Rev Recd Date: 2022-10-11
    • Available Online: 2023-02-11
    Abstract
  • A low energy tele-focus electron gun is designed based on a subsystem of movable non-contact lunar surface potential detector. The electron gun consists of a diode extraction source and two three-element electrostatic lenses. The source produces a divergent beam which is then accelerated to energy Ke by lenses, and is focused into the shape of interest. By optimizing the geometric parameters of electron gun and the voltage applied to electrode, the electron beam has good optical characteristics and the electron energy is adjustable from 5 eV to 500 eV continuously. The initial radius r equals to 5 mm, and the distance p from the output electrode to the beam waist equals to 133 mm when the beam energy is 5 eV. As the beam energy increases to 500 eV, initial radius r decreases to 3 mm, and the distance p decreases to 105 mm. The electron beam reflected by lunar electric field is received by the collector plate. When working length H is between 400 mm and 600 mm, the electrons received by plate account for more than 96% of the beam electrons. The mass of the electron gun is only 408 g, which can meet the requirements of electron guns for lunar exploration.

     

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