A5088740647- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Microwave Engineering and Waveguides
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- Electromagnetic Simulation and Numerical Methods
- Particle Accelerators and Free-Electron Lasers
- Electrostatic Discharge in Electronics
- Antenna Design and Analysis
- Superconducting Materials and Applications
- Advanced Antenna and Metasurface Technologies
- Metaheuristic Optimization Algorithms Research
- Electromagnetic Launch and Propulsion Technology
- Advanced Algorithms and Applications
- Vacuum and Plasma Arcs
- Laser-induced spectroscopy and plasma
- Electromagnetic Scattering and Analysis
- Antenna Design and Optimization
- Laser-Plasma Interactions and Diagnostics
- Engineering Applied Research
- Radio Frequency Integrated Circuit Design
- Advanced Computational Techniques and Applications
- Geophysical Methods and Applications
- Electric Motor Design and Analysis
- Magnetic confinement fusion research
University of Electronic Science and Technology of China
2015-2024
Northwest Institute of Nuclear Technology
2008-2024
Yanshan University
2024
Nanchang University
2024
Shenzhen Institute of Information Technology
2024
Shenzhen Institutes of Advanced Technology
2023
Chongqing University
2022
Wuhan University of Technology
2006-2021
Hunan Xiangdian Test Research Institute (China)
2017-2020
Zunyi Normal College
2016-2019
The particle swarm optimization (PSO) technique is a powerful stochastic evolutionary algorithm that can be used to find the global optimum solution in complex search space. However, it has been observed there great variation its performance due dimensionality of problem and location with respect boundaries present paper attempts resolve this by proposing simple hybrid "damping" boundary condition combines characteristics offered existing "absorbing" "reflecting" boundaries. Simulation...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The development of Microwave-Tube Simulator Suite (MTSS) is reported. MTSS an integrated full-featured software package for microwave-tube analysis and design. It includes a friendly user-interface module three physics simulators. Microwave-tube design environment the module, which provides powerful solid-modeling front end graphical computational postprocessing functionality. Electron optics...
Recent developments to microwave tube simulator suite (MTSS) are reported in this paper. The MTSS is a full-featured tightly integrated software package for analysis and design. It includes commercial grade user interface three physics simulators. electron optics finite-element (FE) 2-D 3-D electrostatic steady-state beam trajectory code that has been used design optics, including gun collector. High-frequency circuit full FE computational electromagnetic aims get the accurate wave character...
This paper reports the development of a fully 3-D finite-element (FE) design tool for electron guns and collectors called optics simulator (EOS). It is module microwave tube suite (MTSS) developed by University Electronic Science Technology China. EOS specifically targets problem classes including axisymmetric gun, gridded multibeam multistage depressed collector. steady-state trajectory code, which solver electrostatic field that takes into account secondary electrons, space-charge effects,...
A 3-D advanced specialized simulator for designing a microwave-tube slow-wave structure (SWS), called the high-frequency circuit (HFCS), has been developed. It is one module of our recently developed suite. The four major features HFCS are as follows: 1) Both lower and higher order tetrahedral basis functions applied in finite-element analysis; 2) two kinds periodic boundary-condition techniques proposed, which dramatically reduces memory requirements solution times; 3) Arnoldi algorithm...
Recent developments on our electron optics simulator (EOS) are reported in this paper. EOS is the finite-element 2-D and 3-D steady-state beam trajectory codes which target problem classes, including axisymmetric guns, gridded multibeam multistage depressed collectors at present. In order to improve accuracy, reduce computational time computer memory consumption, extend application scope, four significant advances have been made, they presented The quadratic interpolation function, has a...
Based on the transmission-line code, a 1-D circuit model for impedance transformer with an arbitrary profile is developed, and simulation results are compared those of existing literatures. By using this model, power efficiencies pulse compression ratios transformers (with Gaussian, exponential, linear profiles) were quantified as functions Ψ (the ratio output to input transformers) Γ pulsewidth one-way transit time transformers). The indicate that exponential have maximum ratios. However,...
A half‐mode substrate integrated waveguide (HMSIW) bandpass filter loaded with modified complementary split‐ring resonators (CSRRs) is presented. The CSRR, realised by utilising horizontal–asymmetrical stepped‐impedance (SI) structure in the conventional can enhance equivalent capacitance and inductance of CSRR consequently shift resonant frequency downwards. Therefore, for same operation frequency, SICSRR occupy smaller size than which provides a promising method to achieve size‐reduction...
Self-triggered pre-ionized switches with four-electrode structures are widely used in large pulsed power generators. Reducing its time delay jitter is an essential requirement. To understand the delay, this paper investigates breakdown processes and mechanisms. The switch divided into two symmetrical sub-gaps a sphere-plate structure. of nitrogen photographed by ICCD camera. It observed that can be separately spark discharge. Uniform discharge stimulated from main electrodes sub-gaps....
A low inductance three-electrode field-distortion gas switch (TFGS) used for linear transformer drivers (LTDs) is developed and tested. Based on the experimental platform, short-circuit of a brick which consists two 100-nF capacitors connected electrically in series with TFGS measured to be less than 151 nH. By changing electrode materials, self-breakdown triggering characteristics TFGSs pollution insulators are compared, respectively. The results show that when main electrodes made WNiFe...
Using beam wave interaction simulator (BWIS), one module of microwave tube suite (MTSS), a wideband helix TWT has been accurately simulated. The slow-wave circuit parameters are calculated by high frequency simulator.
This paper reports the development of a 3-D finite-element design tool for permanent-magnet focusing system called magnetic simulator (MFS). It is new module microwave-tube suite developed by University Electronic Science and Technology China. MFS specifically targets problem classes including periodic permanent magnet, wiggler, quadrupoles, cusped so on. code scalar potential solver magnetostatic field. can be used designing, optimizing, testing, validating permanent-magnetic systems. The...
Abstract In this article, a wideband microstrip bandpass filter with cross‐coupling is presented. The adopts short‐stub‐loaded dual‐mode resonator (SSL‐DMR) and two stepped‐impedance spurline resonators (SISLRs) to achieve size miniaturization. Meanwhile, the trisection topology utilized transmission zeros (TZs) on both sides of passband, which good sideband selectivity can be exhibited. Furthermore, SISLRs at input output ports also contribute another TZ higher frequency upper stopband,...
In order to study the strong electromagnetic pulse effect of critically vulnerable equipment in power systems and evaluate survivability under high-altitude pulses, it is necessary characteristics transient response metal oxide arresters by experiment. this paper, an experimental platform for conduction current injection a typical 10 kV arrester was set up, key parameters such as peak value overshoot voltage, residual action voltage time were obtained The results show that: type 3.53 times...
In this study, a secondary electron emission (SEE) module is updated to Alioth, 3-D electromagnetic (EM) particle-in-cell (PIC) software for simulating the multipactor. To solve problems of low computational efficiency and overburden caused by considerable number electrons, particle merging scheme based on Russian roulette introduced. The multipactor process an impedance transformer investigated from generation seed electrons saturation through PIC method combined with scheme. time evolution...
The breakdown process of a self-triggered preionized switch with the four-electrode structure under nanosecond pulses is studied based on optical diagnosis. both subgaps initiates from main electrode surface in form uniform discharge. A uniform-like low-impedance discharge channel forms first cathode side subgap. Then several streamer-like high-impedance channels later anode Therefore, overvoltage after forms. intensity indicates that subgap breaks down. When injection time preionization...
To reduce the trigger threshold voltage of multi-gap gas switch used for linear transformer drivers, a method is proposed by mounting resistors and capacitors in parallel with gaps. Based on circuit model six-gap switch, gap distribution during triggering process analyzed. When triggered, between gaps mainly determined stray capacitance electrodes. In such condition, not fully applied gap, as consequence, higher required obtaining low jitter. The effects capacitor parameters characteristics...
Gas pressurized closing switches are one of the most important elements in FLTD-based systems. Improving trigger performance gas is useful for optimizing output parameters and reliability FLTD. In this paper, breakdown characteristics gap overvoltage studied experimentally. The reasons different two gaps also investigated. results show that delay more influenced by voltage, while working coefficient always higher than gap. jitter voltage accounts 60% total switch jitter, hardly changed with...
In this paper, a novel microstrip bandpass filter is proposed to enhance sideband selectivity, suppress harmonic frequency up three-order as well keep miniaturized size for synthesizer application. The constructed by four λ /4 folded stepped-impedance resonators (FSIRs) and two /2 at input/output ports create three pairs of coupling paths then produce cross-coupling transmission zeros (TZs) achieve miniaturization with 96% reduction compared the conventional filter. By adding common grounded...