A Carbon-Nanotube Cold-Cathode Reflex Klystron Oscillator: Fabrication @ X-Band and Returning Electron Beam Realization

A Carbon-Nanotube Cold-Cathode Reflex Klystron Oscillator: Fabrication @ X-Band and Returning Electron Beam Realization
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碳纳米管冷阴极反射速调管振荡器:X 波段的制造和返回电子束的实现

DOI:
10.3390/electronics11081231
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发表时间:
2022-04
期刊:
影响因子:
2.9
通讯作者:
Shaozhi Deng
Shaozhi Deng
中科院分区:
工程技术3区
文献类型:
--
作者:
Jiupeng Li;Yu Zhang;Yanlin Ke;Tianzeng Hong;Shaozhi Deng

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介绍了一种基于碳纳米管冷阴极的反射式速调管振荡器的设计和制作。采用静电聚焦的碳纳米管冷阴极电子枪、凹腔阳极和反射极组装了X波段速调管振荡器结构。电子枪采用凸形碳纳米管薄膜发射体作为阴极。制作了谐振频率为8.376 GHz的凹腔。本文主要研究速调管振荡器结构中的返回电子注。给出了阳极电流和返回电子束振幅随反射极电压变化的实验结果。结果表明,较高的冷阴极引出电压对返回电子束有重要影响。为了降低引出电压对电子速度的影响,增大负聚焦电压和提高聚焦极高度可以改善返回电子束的特性。
This paper presents the design and fabrication of a reflex klystron oscillator based on a carbon nanotube (CNT) cold-cathode. An X-band klystron oscillator structure is assembled with a CNT cold-cathode electron gun with an electrostatic focusing, a re-entrant cavity as anode, and a repeller. The electron gun adopts a convex CNT film emitter as the cathode. A re-entrant cavity resonating at 8.376 GHz is fabricated. The study mainly focuses on the returning electron beam in the klystron oscillator structure. The experimental results of variations of the anode current and returning electron beam amplitude with repeller voltage are presented. It is demonstrated that a higher extracting voltage of the cold-cathode has an important influence on the returning electron beam. To decelerate electron velocity from the extracting voltage, increasing negative focusing voltage and focusing electrode height in the electron gun can improve the returning electron beam characteristics.
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