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Boosting the electron beam transmittance of field emission cathode using a self-charging gate

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  • Dongyang Xiao

    (Huazhong University of Science and Technology
    Huazhong University of Science and Technology)

  • Huanhuan Du

    (Huazhong University of Science and Technology
    Huazhong University of Science and Technology)

  • Leimeng Sun

    (Huazhong University of Science and Technology)

  • Xiaochen Suo

    (Huazhong University of Science and Technology)

  • Yurong Wang

    (Huazhong University of Science and Technology)

  • Yili Zhang

    (Huazhong University of Science and Technology)

  • Shaolin Zhang

    (Huazhong University of Science and Technology)

  • Shuangyang Kuang

    (Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology)

  • Fangjing Hu

    (Huazhong University of Science and Technology)

  • Liangcheng Tu

    (Huazhong University of Science and Technology
    Sun Yat-sen University (Zhuhai Campus))

  • Daren Yu

    (Lab of Plasma Propulsion, Harbin Institute of Technology (HIT))

  • Peiyi Song

    (Huazhong University of Science and Technology)

Abstract

The gate-type carbon nanotubes cathodes exhibit advantages in long-term stable emission owing to the uniformity of electrical field on the carbon nanotubes, but the gate inevitably reduces the transmittance of electron beam, posing challenges for system stabilities. In this work, we introduce electron beam focusing technique using the self-charging SiNx/Au/Si gate. The potential of SiNx is measured to be approximately −60 V quickly after the cathode turning on, the negative potential can be maintained as the emission goes on. The charged surface generates rebounding electrostatic forces on the following electrons, significantly focusing the electron beam on the center of gate hole and allowing them to pass through gate with minimal interceptions. An average transmittance of 96.17% is observed during 550 hours prototype test, the transmittance above 95% is recorded for the cathode current from 2.14 μA to 3.25 mA with the current density up to 17.54 mA cm−2.

Suggested Citation

  • Dongyang Xiao & Huanhuan Du & Leimeng Sun & Xiaochen Suo & Yurong Wang & Yili Zhang & Shaolin Zhang & Shuangyang Kuang & Fangjing Hu & Liangcheng Tu & Daren Yu & Peiyi Song, 2024. "Boosting the electron beam transmittance of field emission cathode using a self-charging gate," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45142-0
    DOI: 10.1038/s41467-024-45142-0
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    References listed on IDEAS

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    1. I. Levchenko & S. Xu & G. Teel & D. Mariotti & M. L. R. Walker & M. Keidar, 2018. "Publisher Correction: Recent progress and perspectives of space electric propulsion systems based on smart nanomaterials," Nature Communications, Nature, vol. 9(1), pages 1-1, December.
    2. I. Levchenko & S. Xu & G. Teel & D. Mariotti & M. L. R. Walker & M. Keidar, 2018. "Recent progress and perspectives of space electric propulsion systems based on smart nanomaterials," Nature Communications, Nature, vol. 9(1), pages 1-19, December.
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