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

doi:10.1109/LED.2022.3151714

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

University of Electronic Science and Technology of China

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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 language	English
Pages (from-to)	615-618
Journal	IEEE Electron Device Letters
Volume	43
Issue number	4
DOIs	https://doi.org/10.1109/LED.2022.3151714
Publication status	Published - 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

Funding

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.

Keywords

electron gun
field emission
carbon nanotube

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Cite this

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title = "Development on a high-beam-transparency gridded electron gun based on a carbon nanotube cold cathode",

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.",

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author = "Matthew Cole and Qingyun Chen and Xuesong Yuan and Zhang, {Y N} and Xiaotao Xu and Zexiang Chen and Yong Yin and Hailong Li and Lin Meng and Yang Yan",

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AU - Chen, Zexiang

AU - Yin, Yong

AU - Li, Hailong

AU - Meng, Lin

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AB - 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.

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ER -

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

Abstract

Bibliographical note

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Keywords

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