A5029588621- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Pulsed Power Technology Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Terahertz technology and applications
- Radio Frequency Integrated Circuit Design
- Electromagnetic Simulation and Numerical Methods
- Plasma Diagnostics and Applications
- Superconducting and THz Device Technology
- ZnO doping and properties
- Analytical Chemistry and Sensors
- Laser Design and Applications
- Escherichia coli research studies
- Geomechanics and Mining Engineering
- Enterobacteriaceae and Cronobacter Research
- Superconducting Materials and Applications
- Hemostasis and retained surgical items
- 3D Surveying and Cultural Heritage
- Synthesis and biological activity
- Advanced Materials and Mechanics
- Rock Mechanics and Modeling
- Synthesis of Organic Compounds
- Microwave and Dielectric Measurement Techniques
- Orthopedic Surgery and Rehabilitation
University of Electronic Science and Technology of China
2022-2025
Cockcroft Institute
2024
Sci-Tech Daresbury
2024
China University of Mining and Technology
2022-2023
Lancaster University
2020-2021
European Organization for Nuclear Research
2018-2020
Lanzhou University
2020
First Hospital of Lanzhou University
2020
Xuzhou Medical College
2018
Tsinghua University
2014-2016
Abstract CompactLight is a Design Study funded by the European Union under Horizon 2020 research and innovation funding programme, with Grant Agreement No. 777431. was conducted an International Collaboration of 23 international laboratories academic institutions, three private companies, five third parties. The project, which started in January 2018 duration 48 months, aimed to design innovative, compact, cost-effective hard X-ray FEL facility complemented soft source pave road for future...
The High Efficiency International Klystron Activity (HEIKA) was initiated at CERN in 2014 to evaluate and develop new klystron bunching technologies for high-efficiency klystrons application the large-scale scientific projects such as Compact Linear Collider (CLIC) Future Circular (FCC). success of development strongly depends on availability specialized computer codes. Unfortunately, accurate efficient 2-D large-signal codes are proprietary not freely available wide community. 1.5-D code...
To shorten the design cycle of 2-D axisymmetric electron gun, a new methodology is reported in this article. Unlike method iterating gun structure through particle simulations, for primary beam optics anode–cathode gap, mainly needs pure electrostatic simulations to achieve target beam-edge potential profiles. Based on such an approach, required structure, including cathode, control electrode, and anode, can be quickly obtained. The subsequent handling higher order effects typically require...
Compactness and cost-effectiveness are two major concerns in the development of a Ka-band linearizer, which is crucial accelerator component European CompactLight project. A higher order mode (HOM) multibeam Klystron (MBK) could accommodate distributed electron current with low operating voltage 60 kV, thus making it competitive to deliver high RF power at frequency compared single beam or fundamental MBK. In this article, modeling design study 36-GHz HOM MBK presented. The double...
The electron optical systems (EOS) play a vital role in vacuum devices (VED). This letter reported the design and experiments of sheet EOS for 1.03 THz traveling wave tube (TWT). A high-current-density beam (SEB) gun generating up to 20.3-mA at 22.4-kV is designed, based on requirements this TWT. Due very high operating frequency, more than 1 THz, miniature tunnel waist with dimension 0.05 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The RF power production efficiency is one of the major concerns in 3-TeV Compact Linear Collider (CLIC) Drive Beam Accelerator, as it responsible for almost 50% entire accelerator complex consumption. klystron technology with dc post acceleration prebunched beam was reconsidered recently, an attempt to develop a technological solution high efficiency, L -band multibeam klystrons (MBKs). In this article, modeling and design study CLIC MBK two-stage (TS) configuration presented. TS performance...
To achieve tens of kilowatt (kW) output power, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${W}$ </tex-math></inline-formula> -band klystron usually employs a large beam tunnel to accommodate high current. The deteriorated effective impedance the cavity could be reenhanced by adopting extended interaction (EI) cavities. In this article, new approach utilizing simple fundamental modes in cascaded...
In this letter, we present a novel non-quasi-2D slow-wave structure (NQSWS) for THz sheet beam traveling-wave tubes (THz SB TWTs), which have been conceived, fabricated and tested. Our proposed differs from the conventional quasi-2D structure, in featured cosine fluctuation horizontal direction on metallic roof proximity of tunnel. This modification results lower cutoff frequency, flatter dispersion property, higher average interaction impedance. Comparing with its counterpart same tunnel...
The modified pill-box window is designed and manufactured as a power-coupler part of the 220-GHz folded waveguide backward wave oscillator in Institute Applied Electronics. Owing to structure, both fringe area end thin dielectric piece can be metalized, thus reliability vacuum seal strength greatly improved compared with its traditional counterpart. An analytical method developed from previous equivalent circuit theory window. According expressions, inner parameter roughly designed. 3-D...
In this letter, the modified flat-roofed sine waveguide slow-wave structure (FRSWG-SWS) is proposed for wideband high-power sub-terahertz traveling-wave tube (sub-THz TWT), which possesses advantages of wide operating bandwidth, low loss, minimal reflection, and ease fabrication. The simulation results demonstrate that transmission parameter more than −5.0 dB in frequency range between 210 250 GHz. beam–wave interaction indicate FRSWG can provide over 50 W output power 30 gain from 205 to...
A semianalytical parametric scaling procedure (PSP) for klystron design has been developed. The PSP allows existing designs to be scaled different operating frequencies, beam power, and perveance, while maintaining the electron bunching deceleration processes. For fixed layout of a RF circuit, provides parameters which are nearly optimal. theoretical background step by derivation principles presented. effectiveness is shown through generic five-cavity L-band klystron.
Backward-wave oscillator (BWO) is a promising candidate as millimeter-wave and submillimeter-wave (MMW/SMMW) power source has compact configuration, moderate output power, frequency-tuning abilities. The physical conditions for increasing the threshold current of typical MMW/SMMW-BWO are theoretically studied in this paper. We demonstrate greater effect axial phase velocity variation deformed slow-wave structures on 220-GHz folded waveguide (FW) BWO comparison with other insensitive factors....
The traditional leveling, total station, and global navigation satellite system (GNSS) the new differential interferometric synthetic aperture radar (DInSAR) terrestrial laser scanning (TLS) systems have their own advantages limitations in deformation monitoring of mining areas. It is difficult to obtain accurate information only using single-source measurement data. In this study, we propose an LOS correction method for DInSAR areas by fusing ground data without control points. Based on...
In klystron amplifiers, spurious oscillations caused by the backstreaming electrons from collector may lead to unacceptable instabilities in experiments. To facilitate fast and accurate analysis of such types self-oscillations, rather than performing time-consuming particle-in-cell (PIC) simulations, small signal theory predict threshold conditions klystrons has been further developed implemented into computer code KlyC. If oscillation occurs, frequency <italic...
High-frequency, high-power klystrons proved to be significant for application in compact particle accelerators, high-resolution radars, and fast data communication systems. As most of the linear beam devices, performance klystron deteriorates progressively with an increasing operating frequency due reduction individual RF cavity impedances. Coupled cell structures can alleviate such degradation by extending beam-wave interaction region. The accurate simulation coupled structure relies on...
The two-stage (TS) multibeam klystron (MBK) technology has recently attracted significant research attention due to its compactness and high-efficiency (HE) performance. However, there is still a lack of scientific on the beam optics for such microwave power sources integrated with postacceleration (PA) gap. In this article, comprehensive study based newly developed 2-D code CGUN conducted first time demonstrate most critical steps in design process, by adopting 400-MHz TS MBK future...
To increase the output power of microstrip line traveling-wave tubes, a staggered rings (SRML) slow-wave structure (SWS) based on U-shaped mender (U-shaped ML) SWS and ring-shaped (RML) has been proposed in this paper. Compared with ML RML SWS, SRML wider transverse width, which means larger area for beam–wave interaction. The simulation results show that bandwidth than lower phase velocity SWS. Input/output couplers, consist probes transition sections, have designed to transmit signals from...
The damage of overlying strata and ground surface caused by the one-time mining space is relatively severe in steeply inclined extra-thick coal seams. unique law subsidence at these conditions still missing. Taking Huating Dongxia Coal Mine as research background, this paper reveals law-governing effects on rock movement deformation seam with different dip angles thicknesses using methods measurement, theoretical analysis, numerical simulation. Based characteristics inclination deformation,...
Background: The study was conducted to assess the resistance capacity of quinolone against Shigella flexneri , and investigate involved mechanism. data were collected from Jiangsu Province, China in 2016. Methods: number 81 S. obtained 12 cities Province during Slide agglutination taken for serotyping, susceptibility test identified by disc diffusion method. PCR aimed amplify resistance-determining region ( QRDR ) genes screen plasmid-mediated (PMQR) determinants. Chromosomal mutation...
In Klystron amplifiers, monotron oscillations may cause unacceptable beam instabilities. For facilitating fast and accurate analysis of such processes, rather than performing time-consuming particle-in-cell simulations, the theory has been further developed for small- large-signal regimes implemented into klystron computer code KlyC. This development includes full considerations space-charge effects, relativistic effects can operate with arbitrary field distributions resonant mode. The...
The latest development of 220 GHz folded waveguide (FW) backward wave oscillator (BWO) is presented here. pill-box window system, beam optical system (BOS), slow structure (SWS) have been designed, machined and tested. However, the collector current prototype tube can just reach 13 mA with emission 22 due to imperfection magnetic field, where no microwave signal detected. In previous SWS design, threshold roughly estimated as 12 mA, which may become higher in real case. Apart from improving...
The stable transmission of sheet electron beam (SEB) with a large aspect ratio is the key to success high-power SEB devices. This article researches instability large-aspect-ratio (LAR-SEB) in traditional period cusp magnet (PCM). research reveals that mismatch between nonlinear horizontal space charge field LAR-SEB and linear bias magnetic ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${B} _{y,\text...