Beam Test of a Novel CNT Cathode-Based Electron Gun Assembled in a TWT
Beam Test of a Novel CNT Cathode-Based Electron Gun Assembled in a TWT
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DOI：
10.1109/ted.2019.2902385
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发表时间：
2019-05-01
影响因子：
3.1
通讯作者：
Feng, Jinjun
中科院分区：
文献类型：
--
作者：
Li, Xinghui;Chen, Bo;Feng, Jinjun
提出了一种基于碳纳米管（CNT）阴极的磁聚焦X波段行波管（TWT）。 CNT行波管电子枪结构简单，由CNT发射电极和环形阳极组成，没有金属网引出电极，也没有静电聚焦电极。场发射电子由环形阳极直接引出，而电子束聚焦则通过额外的磁场实现。 TWT除了CNT电子枪外，主要有高频相互作用电路和集电极。所有这些部件都完全浸没在均匀的轴向磁场中，因此，电子在从阴极表面向集电极行进的过程中受到洛伦兹力的限制。所制造的 CNT TWT 在提供均匀轴向磁场的超导系统中进行了测试。直流模式测试表明，大约86%的发射电子可以到达集电极，这比普通的栅控CNT电子枪要好。
A magnetic-focused X-band traveling wave tube (TWT) based on carbon nanotube (CNT) cathode is presented. The CNT TWT has a simple structure of the electron gun, consisting of a CNT emitter electrode and a ring-shaped anode, with no metallic mesh extracting electrode, nor electrostatic focusing electrode. The field emission electrons are extracted directly by the ring-shaped anode, while the electron beam focusing is realized by an extra magnetic field. Apart from the CNT electron gun, the TWT mainly has a high-frequency interaction circuit and a collector. All these components are totally immersed in a uniform axial magnetic field, and thus, electrons are confined by the Lorentz force during their traveling process from the cathode surface toward the collector. The fabricated CNT TWT was tested in a superconducting system providing a uniform axial magnetic field. The dc mode testing showed about 86% of the emission electrons can reach collector, which is better than a common gate-controlled CNT electron gun.