A5052477016- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Terahertz technology and applications
- Radio Frequency Integrated Circuit Design
- Millimeter-Wave Propagation and Modeling
- Insects and Parasite Interactions
- Induction Heating and Inverter Technology
- Engineering Applied Research
- Particle accelerators and beam dynamics
- Offshore Engineering and Technologies
- Educational Reforms and Innovations
- GaN-based semiconductor devices and materials
- Pulsed Power Technology Applications
- Geomechanics and Mining Engineering
- Metamaterials and Metasurfaces Applications
- Particle Accelerators and Free-Electron Lasers
- Superconducting and THz Device Technology
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
University of Electronic Science and Technology of China
2021-2024
Yuncheng University
2010
An extended interaction klystron (EIK) working at the frequency of 340 GHz is designed in this present article. The characteristic impedance, coupling coefficient, and normalized electron conductance cold cavities are analyzed optimized. To improve output power, EIK adopts a prebunching (PB)-cavity high-frequency structure (HFS). Compared with conventional terahertz (THz) EIK, coherence PB-cavity enhanced, power improved. 3-D particle-in-cell (PIC) simulation predicts driven by 0.20-A,...
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,...
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...
In this article, we propose a simulation method to investigate the noise mechanism of traveling-wave tube (TWT). Based on nonlinear theory Lagrangian description, 1-D model is established analyze shot and velocity electron beam in drift space, which clearly shows that propagates along with standing wave shape. The can be periodically converted into each other transmission, consistent prediction classical developed by Pierce Danielson (1954). Using beam–wave interaction theory, evolution...
Due to the superior electromagnetic coupling characteristics, subwavelength hole array structure has attracted widespread attention. In this paper, a new type of extended interaction amplifier (EIA) is designed by combining with trapezoidal line circuit. The resonant cavity simulation in <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{TM}_{31}-2\pi$</tex> mode terahertz analyzed. Through 3D Particle-In-Cell (PIC) simulation, when input...
With demanding applications in high-data-rate communication, a folded-waveguide (FWG) traveling-wave tube (TWT) faces the challenge of gain fluctuation and bandwidth limitation. To flatten extend bandwidth, novel 3-stage equalization technique (GET) is proposed applied FWG-TWT this article. This shifts operating point to high-frequency range middle section. Gain can be implemented by improving at high frequency decreasing low frequency. Furthermore, GET also has significant advantage...