Development on a high-beam-transparency gridded electron gun based on a carbon nanotube cold cathode

Matthew Cole, Qingyun Chen, Xuesong Yuan, Y N Zhang, Xiaotao Xu, Zexiang Chen, Yong Yin, Hailong Li, Lin Meng, Yang Yan

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3 Citations (SciVal)
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Abstract

We here report on the development of an improved dual-gridded electron gun based on a carbon nanotube cold cathode that enhances electron beam transparency and reduces grid interception and loss pathways. Compared with microscale tip Spindts, the dual-gridded construction decreases challenges associated with nanomaterial growth, fabrication, and assembly. Our experimental findings show that this dual-gridded CNT electron gun can support anode output currents (cathode emission current) of up to 700 mA, with a beam-transparency of up to ~100% and a compression ratio of 1/19. A beam spot of uniform brightness is obtained and the radius of the beam spot is 1.5 mm. In addition, our studies show that the device can operate at 1/100 duty cycle continuous pulse with a stable current of around 100mA over 100 h.

Original languageEnglish
Pages (from-to)615-618
JournalIEEE Electron Device Letters
Volume43
Issue number4
DOIs
Publication statusPublished - 15 Feb 2022

Bibliographical note

Funding Information:
This work was supported in part by the National Key Research and Development Program of China under Grant 2019YFA0210202, in part by the National Natural Science Foundation of China under Grant 61771096, in part by the Sichuan Science and Technology Program under Grant 2021YJ0096, and in part by the Fundamental Research Funds for the Central Universities under Grant ZYGX2019J012.

Publisher Copyright:
IEEE

Keywords

  • electron gun
  • field emission
  • carbon nanotube

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