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

Dongyang Xiao, Huanhuan Du, Leimeng Sun (), Xiaochen Suo, Yurong Wang, Yili Zhang, Shaolin Zhang, Shuangyang Kuang, Fangjing Hu, Liangcheng Tu, Daren Yu and Peiyi Song ()
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Dongyang Xiao: Huazhong University of Science and Technology
Huanhuan Du: 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
Daren Yu: Lab of Plasma Propulsion, Harbin Institute of Technology (HIT)
Peiyi Song: Huazhong University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-45142-0

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