Dual-Band Terahertz Harmonic Gyrotron Driven by Axis-Encircling Electron Beam

IF 2.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Electron Devices Pub Date : 2025-01-13 DOI:10.1109/TED.2025.3525605

Feng Zhang;Jia-Ji Feng;Xin-Yin Cao;Tien-Fu Yang;Yu-Shan Cho;Ji-Tao Yang;Yue-Yi Zhang;Tsun-Hsu Chang;Chao-Hai Du

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Abstract

Gyrotron driven by the axis-encircling electron beam is a pathway for generating frequency-tunable terahertz radiation on multiple harmonics. In this article, a large-orbit gyrotron (LOG) is designed, manufactured, and experimentally investigated. A magnetic cusp gun (MCG), demonstrating high robustness over a broad range of magnetic fields, has been developed to generate an axis-encircling electron beam with a constant pitch factor of 1.5 and a velocity spread of less than 2%. As the magnetic field strength adjusted at the operating voltage/current of 45 kV/0.7 A, the gyrotron is demonstrated to stably operate at the fundamental harmonic TE12 mode and the second harmonic TE24 mode, at the respective dual bands. The fundamental harmonic oscillation can achieve a wideband continuous frequency tuning range of 5.27 GHz around 160 GHz, with a maximum power of 7.42 kW, corresponding to a working efficiency of 23.5%, and the second harmonic operation can obtain a maximum power of 2.9 kW and an efficiency of 9.2%, with a continuous frequency tuning range of 1 GHz near 391 GHz. The quantitative agreement between experimental results and theoretical calculations indicates the reliability and correctness of the implemented gyrotron system, promising in achieving multiband oscillations at various cyclotron harmonics.

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由轴环绕电子束驱动的陀螺仪是产生频率可调的多谐波太赫兹辐射的一种途径。本文设计、制造并实验研究了大轨道回旋加速器（LOG）。开发的磁尖顶枪（MCG）在广泛的磁场范围内表现出很高的鲁棒性，可产生轴环绕电子束，其间距系数恒定为 1.5，速度差小于 2%。在工作电压/电流为 45 kV/0.7 A 时，随着磁场强度的调整，陀螺仪可以在基谐波 TE12 模式和二次谐波 TE24 模式下稳定地工作在各自的双波段。基谐波振荡可实现 160 GHz 附近 5.27 GHz 的宽带连续频率调谐范围，最大功率为 7.42 kW，对应工作效率为 23.5%；二次谐波工作可获得 2.9 kW 的最大功率和 9.2% 的效率，连续频率调谐范围为 391 GHz 附近的 1 GHz。实验结果与理论计算之间的定量一致性表明，所实施的陀螺仪系统是可靠和正确的，有望在各种回旋谐波下实现多波段振荡。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Electron Devices 工程技术-工程：电子与电气

CiteScore

5.80

自引率

16.10%

发文量

937

审稿时长

3.8 months

期刊介绍： IEEE Transactions on Electron Devices publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanoelectronics, optoelectronics, photovoltaics, power ICs and micro-sensors. Tutorial and review papers on these subjects are also published and occasional special issues appear to present a collection of papers which treat particular areas in more depth and breadth.