A5053535876- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Terahertz technology and applications
- Geomechanics and Mining Engineering
- Pulsed Power Technology Applications
- Engineering Applied Research
- Induction Heating and Inverter Technology
- Radio Frequency Integrated Circuit Design
- Acoustic Wave Resonator Technologies
- Educational Reforms and Innovations
- GaN-based semiconductor devices and materials
- Insects and Parasite Interactions
University of Electronic Science and Technology of China
2022-2025
In this article, we present a design scheme of an electron-optical system (EOS) for terahertz vacuum electron amplifiers. The performance characteristics are studied by simulation, and the feasibility is verified transmission experiment. Based on Pierce method, gun with isolated beam focus electrode (BFE) designed, which has been simulated confirmed CST particle tracking solver OPERA charged solver. A periodic permanent magnet (PPM) including dual D-magnets RF signal coupling port utilized...
In this article, deep reinforcement learning (DRL) is utilized to explore high-performance folded-waveguide (FWG) slow-wave structures (SWSs) for broadband application in traveling-wave tubes (TWTs). DRL combines (DL) perception and (RL) decision-making form a complete automated system from input data output action control. The <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${Q}$...
The folded-waveguide (FWG) traveling-wave tube (TWT) is a promising high-power terahertz (THz) amplifier. However, it challenging to develop THz FWG-TWT with high beam–wave interaction efficiency. In this work, phase jumping technology, which originates from free-electron lasers, proposed boost the efficiency of FWG-TWT. A modified slow wave structure acts as shifter adjust gap between electron beam and electromagnetic wave. By an appropriate value, bunching center keeps for long time in...
In the terahertz band, vacuum electronic devices (VEDs) encounter several challenges. One of key issues is formation and maintenance fine pencil beam. This article proposes a numerical simulation code, called 2-D finite element electron gun (2D_FE_EG), to simulate analyze The code utilizes Galerkin method solve Poisson equation generate an axisymmetric electrostatic field solver. To accurately track trajectory beam, entire solution region discretized using inhomogeneous triangular meshes,...
When millimeter wave folded waveguide (FWG) traveling tube (TWT) operates near saturation, it is usually accompanied by some nonlinear phenomena. These distortions generated in the process of beam-wave interaction will lead to phenomena such as phase distortion, which reduce output performance FWG TWT and seriously affect overall communication system. In this paper, a genetic algorithm introduced optimize nonlinearity (AM/PM) TWT, an E-band used example. Finally, optimization results are...
A novel design scheme of electron gun for terahertz traveling-wave tubes (TWTs) is proposed, whose beam focusing electrode (BFE) includes an outer-focusing and inner-focusing to form a beam-compressive electrostatic field. In this paper, the designed 0.22 THz TWT simulated by OPERA Charged Particle Solver. circular-cylindrical cathode with radius 0.6 mm employed in gun, which provides circular 52 mA at voltage 19.5 kV. Furthermore, simulation characterization suggests that produces high...
This article presents a novel 1-D active transmission matrix-based time-dependent (ATM-TD) model for the beam–wave interaction analysis of folded-waveguide (FWG) traveling-wave tubes (TWTs). The slow wave structure (SWS) is modeled as series coupled resonant cavities, with each cavity by three-port network represented an matrix. voltage and current port alternate time purpose analysis. circuit field in obtained gap can be approximated Gaussian profile. space charge derived from Green...
Traveling-wave tube (TWT) is an important kind of high-power microwave/terahertz source. The physical mechanism the inherent nonlinear beam–wave interaction process in TWT should be accurately investigated for fast and accurate design. Conventional treatment involves a large amount computation thus time-consuming. In this article, we propose novel method to expound TWT, i.e., 1-D collective variable (CV-TWT) model. It utilizes two macroscopic variables, bunching factor <inline-formula...
A novel semi-ellipse bending waveguide (SEBWG) slow wave structure (SWS), which evolves from the folded-waveguide (FWG-SWS), is proposed to develop wide-bandwidth, high power and efficiency traveling-wave tube (TWT). The major advantages of this SWS are flatter dispersion, larger coupling impedance better transmission characteristics in comparison with conventional FWG-SWS. With a pencil electron beam 20.8 kV 50 mA, particle-in-cell simulation results show that, SEBWG-TWT, within operating...