Study of rectangular beam folded waveguide traveling-wave tube for terahertz radiation

Lu, Fengying; Zhang, Changqing; Grieser, M.; Wang, Yong; Lü, Suye; Zhao, Guoqing

doi:10.1063/1.5008287

Cited by 10 publications

References 18 publications

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One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

et al. 2019

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A 1D frequency-domain nonlinear model for illustrating the beam-wave interactions of sine waveguide (SWG) traveling-wave tubes (TWTs) was studied. Our model considered space-charge fields and Ohmic losses to make the model closer to practical situations. The sheet beam was split into a series of rectangular electron plates in the axial direction, and the space-charge field was calculated by solving Green's function. The dynamic equations and relativistic equations of motion were solved self-consistently to obtain the nonlinear characteristics of the power saturation, as well as the electron velocity, phase space distributions, etc. A 0.22 THz SWG TWT was used to illustrate and verify the validity of the theoretical model. The output power and gain results were in good agreement with those from the Computer Simulation Technology (CST) 3D particle-in-cell simulation. In addition, the code developed based upon the theoretical model produced faster results than the CST simulation.

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One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

et al. 2019

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Study of a terahertz folded waveguide oscillator with sheet electron beam

Lei

et al. 2021

AIP Advances

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High power vacuum electronic devices of the millimeter wave to terahertz regime are attracting extensive interest due to their potential applications in science and technologies. In this paper, a novel sheet beam (SB) folded waveguide (FWG) slow-wave structure (SWS) is applied and studied for enhanced output power of oscillators. Through the analysis of high-frequency characteristics of the SB FWG-SWS, the selection of an appropriate beam–wave interaction point on the dispersion curve and beam position is determined for an SB folded waveguide oscillator (FWO) operating near the 2π stopband point. The fundamental mode operation of the SB FWO was verified by the particle-in-cell simulation results, which also indicate that the SB FWO exhibits a better outstanding performance (84.6 W with a beam voltage and current of 25.1 kV and 200 mA, respectively) than the conventional circular beam FWO. The transmission stability of the SB was analyzed by observing the interception beam current in the FWO. The voltage and frequency tuning performance of the SB FWO were discussed in combination with clutter suppression. A preliminary experiment was conducted by fabricating a 220 GHz SB FWG-SWS and measuring the S parameter.

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Simulation study of coaxial virtual cathode oscillator as a THz source

Zamani

Shokri

2023

Physics of Plasmas

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In this paper, a coaxial virtual cathode oscillator (vircator) is simulated by the particle-in-cell method for the terahertz (THz) band. THz waves have many applications in human life, and many researchers work on related technologies, especially on THz sources like vacuum electronic devices (VEDs). A vircator is a kind of VED that is usually operated at a few GHz, but in this study, a coaxial vircator is proposed as a THz source for the first time. By adding a reflector and center rod to the base coaxial configuration and optimizing the parameters, an output power of about 29 W is achieved at 0.25 THz with the dominant mode of TM01. Working voltage and current are 26 kV and 100 mA, respectively. In addition, to indicate the scalability of the device, two other designs for higher and lower frequencies are simulated. Simplicity is one of the important advantages of the proposed THz coaxial vircator in comparison to other THz sources.

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Study of rectangular beam folded waveguide traveling-wave tube for terahertz radiation

Cited by 10 publications

References 18 publications

One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

Study of a terahertz folded waveguide oscillator with sheet electron beam

Simulation study of coaxial virtual cathode oscillator as a THz source

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