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Mode-Coupling Analysis of Parametric Decay Instability in Magnetized Plasmas

Plasma Science and technology 2014年第9期16卷 809-814页

作者：袁媛江中和郭伟欣孙新锋胡希伟 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

In this paper, derived from Maxwell and fluid equations of plasmas, unified nonlinear wave equations are used to describe the parametric decay instability （PDI） in magnetized plasmas, and in view of mode-coupling, we can obtain all the possible PDI channels. By solving the nonlinear equations with a mode-coupling method, we obtain the growth rate of the PDI, of which all of the three waves are ordinary mode （O-mode） or extraordinary mode （X-mode） wave. Under the dipole approximation, an explicit formula of the growth rate of the X-mode and the condition of the equilibrium density scale are obtained. According to the existence conditions of three X-mode waves, this kind of instability might exist in ECRH with the second harmonic X-mode wave.

关键词： magnetized plasma parametric decay instability mode-coupling theory,growth rate

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Effects of Boundary Current on electromagnetic Dispersion Characteristics for a Relativistic Electron Beam

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Plasma Science and technology 2016年第1期18卷 51-57页

作者：肖集雄曾中夏冬辉王之江刘昌海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

With betatron oscillation characteristics of the electron beam and ion channel effect taken into account,dispersion characteristics of electrostatic modes and TM modes for a relativistic electron beam guided by ion channel are *** relations are derived and solved numerically to investigate the dependence of the dispersion characteristics for electrostatic modes and TM modes on the betatron oscillation frequency and the ratio of the relativistic electron beam radius to the waveguide *** effects of the boundary current on the dispersion characteristic of the TM modes and the interaction between the betatron modes and TM modes are *** considering the boundary current,for a strong ion channel,a new low-frequency branch of the TM modes arises and the interaction frequency between the betatron modes and the TM01modes is increased with the same parameters.

关键词： dispersion characteristics electromagnetic eigenmodes betatron oscillation ion channel

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma Science and technology 2025年第3期 122-130页

作者：黄宇轩张明杨勇吕方伟易霄鹏吕超凡张毅松饶波 State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic EngineeringHuazhong University of Science and Technology National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of Physics

The field-reversed configuration（FRC） plasma thruster driven by rotating magnetic field（RMF）, abbreviated as the RMF-FRC thruster, is a new type of electric propulsion technology that is expected to accelerate the deep space exploration. An experimental prototype, including diagnostic devices, was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 kA. Under the rated operating conditions, the initial plasma density was measured to be 5 × 1017m-3, and increased to 2.2 × 1019m-3after the action of RMF. The coupling efficiency of RMF was about 53%, and the plasma current reached 1.9 kA. The axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss, which verifies the formation of FRC plasma. After optimization research, it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 Gauss. The experimental results are discussed and strategies are proposed to improve the performance of the prototype.

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Grid Forming Converters in Renewable Energy Sources Dominated Power Grid:Control Strategy,Stability,Application,and Challenges

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1239-1256页

作者： Haobo Zhang Wang Xiang Weixing Lin Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology TBEA Sunoasis Company Ltd. the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The renewable energy sources(RESs)dominated power grid is an envisaged infrastructure of the future power system,where the commonly used grid following(GFL)control for grid-tied converters suffers from lacking grid support capability,low stability,***,emerging grid forming(GFM)control methods have been proposed to improve the dynamic performance and stability of grid-tied *** paper reviews existing GFM control methods for the grid-tied converters and compares them in terms of control structure,grid support capability,fault current limiting,and *** the impact of fault current limiting strategies,a comprehensive transient stability analysis is *** addition,this paper explores the typical applications of GFM converters,such as AC microgrid and offshore wind farm high-voltage direct current(OWF-HVDC)integration ***,the challenges to the GFM converters in future applications are discussed.

关键词： Grid following(GFL)control grid forming(GFM)control high-voltage direct current(HVDC) microgrid renewable energy small-signal stability transient stability

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The analysis and assessment of DC-Link voltage control loop dynamics on the transient synchronization stability of grid-following converters

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Electric Power Systems Research 2025年 247卷

作者： Xie, Chenyang Lin, Xinchun Sun, Huiqiang Wei, Juntian Zhang, Jiayan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The transient synchronization stability of grid-following voltage source converters has been extensively investigated, but most of the previous literature has only studied the transient dynamics of the phase-locked loop (PLL) while ignoring the dynamics of the DC-link voltage control (DVC) loop. When the bandwidths of the PLL and DVC are relatively close to each other, erroneous conclusions will be derived if neglecting the transient influence of the DVC loop. This paper first takes into account the transient dynamics of the DVC loop while applying the improved equal-area criterion (EAC) analysis, which reveals how the DVC loop affects the transient synchronization stability. Then, a fourth-order model considering the DVC dynamics is obtained to quantitatively determine a reasonable range of bandwidth and damping ratio for the DVC loop. Moreover, the extent of the influence of DVC on transient synchronization stability with variation of grid strength is analyzed. © 2025

关键词： Transient analysis

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Influence of 3D helical magnetic perturbations on runaway electron generation in J-TEXT tokamak

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Plasma Science and technology 2025年第3期 40-48页

作者：严伟邹癸南陈忠勇李由方建港林志芳江中和王能超饶波李杨波任正康赵传旭钟昱刘凡溪喻寅龙聂子森周洵盛源孙玉伟周松张晓卿杨州军陈志鹏丁永华 the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic EngineeringHuazhong University of Science and Technology School of Electrical Engineering&Automation Jiangsu Normal University

A large number of runaway electrons(REs) generated during disruption can cause significant damage to next-generation large-scale tokamaks. The influence of three-dimensional(3D)helical magnetic perturbations on the suppression of RE generation was explored using a set of 3D helical coils in J-TEXT tokamak, which can excite m/n =-2/2 helical magnetic *** evidence shows that the-2/2 magnetic perturbations caused by the opposite coil current direct plasma toward the high-field side, simultaneously enhancing the magnetic fluctuations, which would enhance the radial loss of REs and even prevent RE generation. On the other hand,-2/2 magnetic perturbations can also reduce the cooling time during the disruption phase and generate a population of high-energy REs, which can interact with high-frequency magnetic fluctuations and in turn suppress RE generation. The critical helical coil current was found to correlate with electron density, requiring higher coil currents at higher densities. According to the statistical analysis of RE generation at different electron densities,the applied-2/2 magnetic perturbations can increase the magnetic fluctuations to the same level at lower electron densities, which can decrease the threshold electron density for RE *** will be beneficial for RE mitigation in future large tokamak devices.

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New Current Control Method of DC Power Supply for Magnetic Perturbation Coils on J-TEXT

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Plasma Science and technology 2014年第11期16卷 1074-1078页

作者：曾武兵丁永华易斌许航宇饶波张明刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

In order to advance the research on suppressing tearing modes and driving plasma rotation, a DC power supply （PS） system has been developed for dynamic resonant magnetic perturbation （DRMP） coils and applied in the J-TEXT experiment. To enrich experimental phe- nomena in the J-TEXT tokamak, applying the circulating current four-quadrant operation mode in the DRMP DC PS system is proposed. By using the circulating current four-quadrant oper- ation, DRMP coils can be smoothly controlled without the dead-time when the current polarity reverses. Essential circuit analysis, control optimization and simulation of desired scenarios have been performed for normal current. Relevant simulation and test results are also presented.

关键词： DRMP power supply (PS) J-TEXT four-quadrant operation

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Equilibrium Reconstruction and Its Integration in J-TEXT

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Plasma Science and technology 2016年第7期18卷 786-790页

作者：张帆徐涛孙新锋张晓卿庄革简翔 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The equilibrium fitting code （EFIT） and its application in the J-TEXT tokamak are integrated by the Matlab language. The function of analysis and visualization to the results is added. In addition, the experiment data measured by soft X-ray （SXR） are used to calculate plasma equilibrium as a constraint condition. The improved EFIT code is used for J-TEXT discharge and the profiles of plasma parameters such as flux function, safety factor q, pressure and current density are obtained from the reconstructed configurations.

关键词： EFIT integrated operation equilibrium reconstruction

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Plasma Response to Supersonic Molecular Beam Injection in J-TEXT

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Plasma Science and technology 2014年第1期16卷 17-20页

作者：肖金水杨州军庄革胡启明冯先德刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Recently, hydrogen fueling experiments with supersonic molecular beam injection （SMBI） system have been performed in the J-TEXT tokamak. To evaluate the effects of the in- jection amount of SMBI on plasma behaviors, moderate and intensive SMBs have been separately injected and compared with each other in Ohmic discharges. With moderate SMBs, electron den- sity increases about twice as before, the size of magnetic island slightly decreases, and the edge toroidal rotation speed in a counter-current direction, measured by a high resolution spectrometer （Carbon V ion, 227.09 nm, r/a-= 0.7-0.8）, is accelerated from 8 km/s to 12 km/s. The state of higher electron density with moderate SMBI can be maintained for a long period, which indicates that plasma confinement is improved. However, with intensive SMBs, the accompanied magne- tohydrodynamic （MHD） activities are triggered, and the electron density increases moderately. The edge toroidal velocity is decreased, in certain cases even reversed in the co-current direction. The statistical result of experimental data for moderate and intensive SMBs suggests a preferred fueling amount （less than 3.2 ~ 1019） to improve the SMBI fueling efficiency in experiments.

关键词： SMBI fuelling plasma responses J-TEXT

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Probing Interfacial Nanostructures of Electrochemical Energy Storage Systems by In-Situ Transmission Electron Microscopy

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Nano-Micro Letters 2025年第1期17卷 1-29页

作者： Liang, Guisheng Zhang, Chang Yang, Liting Liu, Yihao Liu, Minmin Xiong, Xuhui Yang, Chendi Lv, Xiaowei You, Wenbin Pei, Ke Zhong, Chuan-Jian Cheng, Han-Wen Che, Renchao Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Department of Materials Science Academy for Engineering and Technology Fudan University Shanghai200438 China Department of Chemistry State University of New York at Binghamton BinghamtonNY13902 United States

The ability to control the electrode interfaces in an electrochemical energy storage system is essential for achieving the desired electrochemical performance. However, achieving this ability requires an in-depth understanding of the detailed interfacial nanostructures of the electrode under electrochemical operating conditions. In-situ transmission electron microscopy (TEM) is one of the most powerful techniques for revealing electrochemical energy storage mechanisms with high spatiotemporal resolution and high sensitivity in complex electrochemical environments. These attributes play a unique role in understanding how ion transport inside electrode nanomaterials and across interfaces under the dynamic conditions within working batteries. This review aims to gain an in-depth insight into the latest developments of in-situ TEM imaging techniques for probing the interfacial nanostructures of electrochemical energy storage systems, including atomic-scale structural imaging, strain field imaging, electron holography, and integrated differential phase contrast imaging. Significant examples will be described to highlight the fundamental understanding of atomic-scale and nanoscale mechanisms from employing state-of-the-art imaging techniques to visualize structural evolution, ionic valence state changes, and strain mapping, ion transport dynamics. The review concludes by providing a perspective discussion of future directions of the development and application of in-situ TEM techniques in the field of electrochemical energy storage systems. (Figure presented.) © The Author(s) 2025.

关键词： Nanocomposites

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