A5038251780- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Microwave Engineering and Waveguides
- Innovative Microfluidic and Catalytic Techniques Innovation
- Fluid Dynamics and Mixing
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Adaptive Control of Nonlinear Systems
- Advanced Control Systems Optimization
- Fractional Differential Equations Solutions
- Iterative Learning Control Systems
- Transportation Planning and Optimization
- Sensorless Control of Electric Motors
- Pulsed Power Technology Applications
- Adaptive optics and wavefront sensing
- Acoustic Wave Resonator Technologies
- Nonlinear Waves and Solitons
- Nonlinear Photonic Systems
- Heat Transfer and Boiling Studies
- Superconducting and THz Device Technology
- Grit, Self-Efficacy, and Motivation
- Control Systems in Engineering
- Nuclear Engineering Thermal-Hydraulics
- Magneto-Optical Properties and Applications
- Microfluidic and Capillary Electrophoresis Applications
Tianjin University
2021-2024
Changchun Institute of Optics, Fine Mechanics and Physics
2016-2023
Qingdao University of Technology
2021-2022
Chinese Academy of Sciences
2016-2022
Pingdingshan University
2010-2011
FZI Research Center for Information Technology
2003-2006
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2003
Karlsruhe Institute of Technology
2003
A highly efficient quasi-optical mode converter system with several novel features has been designed and tested at Forschungszentrum Karlsruhe (FZK). The consists of a dimpled-wall waveguide launcher, one quasi-elliptical mirror two toroidal mirrors. coupled-mode theory used to analyze the operation prebunching launcher; radiated fields from cut launcher have calculated by scalar diffraction integral. Simulation results show that advanced generates well-focused Gaussian radiation pattern low...
The basic investigations on a coaxial cavity gyrotron operating at 165 GHz have been accomplished and the feasibility of manufacturing 2-MW continuous-wave 170 has demonstrated. In last measurements, data required for fabrication an industrial tube completed. influence misalignment insert operation investigated. limitation high-voltage performance electron gun due to buildup Penning discharge suppressed leakage current measured as function retarding collector voltage.
In the first part of this paper, status 140-GHz continuously operated gyrotrons with an output power 1 MW for stellarator Wendelstein 7-X will be described. With series tube, 1000 kW has been achieved in short pulse operation (milliseconds) electron beam current 40 A, and 1150 at 50 A. a length 3 min limited by available high-voltage (HV) supply, 920 about A efficiency 45% mode purity 97.5% obtained. At reduced 29 570 was measured 1893 s without significant increase tube pressure. The energy...
High-frequency gyrotrons with high output power are mainly used for microwave heating and current drive in plasmas thermonuclear fusion. The development of high-power continuous wave (CW) operation has been progress several years a joint collaboration between different European research centers an industrial partner. status the 140-GHz continuously operating 1 MW stellarator Wendelstein 7-X will be described. An 890 kW achieved pulse length 3 min. limited by available high-voltage supply at...
To combine the advantages of linear active disturbance rejection control (LADRC) and nonlinear (NLADRC) improve contradiction between response speed precision caused by limitation parameter α in NLADRC, a linear-nonlinear switching (SADRC) strategy based on extended state observer (SESO) error feedback law (SSEF) is proposed this paper. First, reasons for performance differences LADRC NLADRC are analysed from theoretical point view, then function (SF) that can change adjusting its parameters...
The Kenics static mixer is one of the most widely studied mixers, whose structure–function relationship has been by varying its aspect ratio and modifying surface. However, effect symmetric structure itself on twisting fluid neglected. In order to study how symmetrical impacts flow, we changed center position elements at twist angle 90° introduced eccentricity factor γ. We applied LHS-PLS this non-standard obtained statistical correlations ratio, Reynolds number, relative Nusselt number...
Gyrotrons are widely used in electron-cyclotron-plasma heating of fusion installations. Modern and future installations require microwave sources with power at least 1 MW. There two main directions the development megawatt gyrotrons GYCOM. The first line is an enhancement parameters for conventional gyrotrons. efforts applied now to implementing CVD diamond windows into providing gyrotron operation CW (or very long pulses tens seconds) regime.
The operation of metro trains with a focus on energy savings can effectively reduce operating costs and carbon emissions. Reducing traction consumption increasing the utilization efficiency regenerative braking are two important energy-saving approaches that closely related to train interstation running strategy timetable. Changes in mass caused by dynamic changes passenger flow represent one factors affecting trains. In this study, differences temporal spatial distributions line were...
The yields of chemical reactions are highly dependent on the mixing pattern between reactants. Herein, we report modification a meso-micromixing interaction reaction model which is applied in batch reactors by leveraging flow characteristics continuous reactors. Both experimental and model-predicted were compared using classical Villermaux–Dushman method self-designed split recombination reactor. This modified significantly reduced error predicted product from approximately 15% to within 3%,...
The design of a multifrequency tunable 1 MW, 10 s gyrotron (105-140 GHz) for controlling plasma instabilities in fusion Tokamaks is presented. It operates the TE/sub 22,8/ mode at 140 GHz and 17,6/ 105 some other modes between. equipped with magnetron injection gun (diode type), cylindrical cavity, an advanced quasi-optical launcher, three specific beam forming mirrors CVD-diamond Brewster window.
Abstract This paper is concerned with the characteristics of a tracking differentiator (TD) in arranging transition process for physical system. In order to overcome disadvantages linear TD (LTD) practice, novel variable parameter (VLTD) proposed. By designing speediness factor as function error, VLTD can track large range set values reasonable speed and acceleration. Analysis shows that converge its value under certain conditions. Meanwhile, acceleration bounds are added VLTD, which...
Abstract The high-precision requirements will always be constrained due to the complicated operating conditions of ground-based telescope. Owing various internal and external disturbances, it is necessary study a control method, which should have good ability on disturbance rejection adaptability system parameter variation. traditional proportional-integral (PI) controller has advantage simple easy adjustment, but cannot deal with disturbances well in different situations. This paper...
Abstract Micro/milli‐scale annular reactor with straight and helical forms has excellent heat mass transfer performance due to the short molecular diffusion distance dual‐wall surface transport. The gap spacing is scalable by adjusting inner outer tube diameter. influence of convection effects on axial dispersion as expanding flow scale requires further elucidation help residence time distribution (RTD) curves Péclet (Pe) numbers. correlation RTD characteristics annulus ratio γ = D h /...