Theory and Experiment of a W-Band Tunable Gyrotron Oscillator

Du, Chao‐Hai; Qi, Xian-Rong; Liu, Pu-Kun; Chang, Tsun-Hsu; Xu, Shou-Xi; Geng, Zhi-Hui; Hao, Baoliang; Xiao, Liu; Liu, Gaofeng; Li, Zheng-Di; Shi, Shanshuang; Wang, Hu

doi:10.1109/ted.2013.2294689

Cited by 22 publications

(12 citation statements)

References 35 publications

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“…Theoretical investigation is based on the former W-band tunable gyrotron experiment [41]. The pre-bunching cavity is excellent to enhance the efficiency of the backward wave interaction, and simultaneously is capable of realizing broadband capability.…”

Section: Discussionmentioning

confidence: 99%

“…The converged field profiles under start-oscillation condition, matured interaction, or any steady state under given system parameters can be self-consistently determined. Details were previously revealed in [16], [27], [37]- [39], [41]- [44].…”

Section: B Traveling-wave Resonancementioning

confidence: 99%

“…Each curve is a converged solution predicted by the frequency domain theory [43] indicating a possible path during magnetic tuning process. Here each curve/path is called an instability mode which is with specified accumulative phase difference throughout the interaction circuit [41], [44], [47], [48],…”

Section: Mode Competition In Pre-bunched Ecmmentioning

confidence: 99%

“…During the past decade, complicated dynamics in the gyro-BWO systems have been systematically revealed. A series of gyro-BWO experiments demonstrated broadband tuning and high efficiency capabilities [27]- [33], [39]- [41].…”

mentioning

confidence: 99%

“…Broadband tuning and high efficiency are simultaneously achieved. Theoretical studies are carried out based on a recent experiment of the 0.1 THz mode fundamental harmonic gyrotron [41]. The pre-bunched ECM is promising for developing a new generation of broadly tunable THz source.…”

mentioning

confidence: 99%

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Broadband Tunable Pre-Bunched Electron Cyclotron Maser for Terahertz Application

Du¹,

Qi²,

Liu³

et al. 2015

IEEE Trans. THz Sci. Technol.

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The relativistic electron cyclotron maser (ECM) has been successfully applied to generating high-power THz wave. In order to realize the additional advantages of broadband tuning and high efficiency interaction, this paper is devoted to exploring the THz pre-bunched ECM. Other than a conventional open-cavity tunable gyrotron consecutively switching between axial modes to realize frequency tuning, a pre-bunched ECM system operates on the backward traveling-wave resonance to achieve broadband smooth tuning. Especially, an interaction circuit of specified axial profile of beam-wave detuning frequency is built to achieve high efficiency. An optimized 0.1 THz pre-bunched ECM system using an electron beam of 30 kV voltage and 3 A current is predicted to generate broad bandwidth of 10 GHz and efficiency between 10% 25%. The broadband tuning pre-bunched ECM is promising for a new generation of broadband and high-power THz source.Index Terms-Broadband tuning, coherent radiation, electron cyclotron maser (ECM), terahertz (THz).

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Section: Discussionmentioning

confidence: 99%

Section: B Traveling-wave Resonancementioning

confidence: 99%

Section: Mode Competition In Pre-bunched Ecmmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Broadband Tunable Pre-Bunched Electron Cyclotron Maser for Terahertz Application

Du¹,

Qi²,

Liu³

et al. 2015

IEEE Trans. THz Sci. Technol.

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Review of Gyrotron Traveling-Wave Tube Amplifiers

Liu

2014

Millimeter-Wave Gyrotron Traveling-Wave Tube Amplifiers

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The design of a multi-harmonic step-tunable gyrotron

Zhu

et al. 2017

Physics of Plasmas

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The theoretical study of a step-tunable gyrotron controlled by successive excitation of multi-harmonic modes is presented in this paper. An axis-encircling electron beam is employed to eliminate the harmonic mode competition. Physics images are depicted to elaborate the multi-harmonic interaction mechanism in determining the operating parameters at which arbitrary harmonic tuning can be realized by magnetic field sweeping to achieve controlled multiband frequencies' radiation. An important principle is revealed that a weak coupling coefficient under a high-harmonic interaction can be compensated by a high Q-factor. To some extent, the complementation between the high Q-factor and weak coupling coefficient makes the high-harmonic mode potential to achieve high efficiency. Based on a previous optimized magnetic cusp gun, the multi-harmonic step-tunable gyrotron is feasible by using harmonic tuning of first-to-fourth harmonic modes. Multimode simulation shows that the multi-harmonic gyrotron can operate on the 34 GHz first-harmonic TE11 mode, 54 GHz second-harmonic TE21 mode, 74 GHz third-harmonic TE31 mode, and 94 GHz fourth-harmonic TE41 mode, corresponding to peak efficiencies of 28.6%, 35.7%, 17.1%, and 11.4%, respectively. The multi-harmonic step-tunable gyrotron provides new possibilities in millimeter–terahertz source development especially for advanced terahertz applications.

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Theory and Experiment of a W-Band Tunable Gyrotron Oscillator

Cited by 22 publications

References 35 publications

Broadband Tunable Pre-Bunched Electron Cyclotron Maser for Terahertz Application

Broadband Tunable Pre-Bunched Electron Cyclotron Maser for Terahertz Application

Review of Gyrotron Traveling-Wave Tube Amplifiers

The design of a multi-harmonic step-tunable gyrotron

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