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arXiv 2025年

作者： Hou, Zhangrong Zhou, Song Wang, Nengchao Ding, Yonghua Jiang, Zhonghe Liang, Yunfeng Ren, Zhengkang Mao, Feiyue Yang, Qinghu Wang, Jiaming Xu, Xin Yang, Yutong Hua, Jiankun Xuan, Zijian Zhao, Chuanxu Li, Yangbo Yu, Lei Xia, Donghui Chen, Zhipeng Yang, Zhoujun State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung—Plasmaphysik Jülich52425 Germany Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the island divertor configuration on the J-TEXT tokamak. Experimental results reveal that the size of the edge open magnetic island with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as island healing, occurs when ECRH with a power of 500~600 kW is deposited in the plasma core or when 250 kW of ECRH is deposited at r"# = 0.5 a, where a is the minor radius. The reduction of the island width makes the island divertor ineffective and transition into the limiter configuration. A model incorporating the influence of ECRH on the scrape-off layer (SOL) thermoelectric current is proposed to explain the observed changes in the edge magnetic topology of the island divertor configuration. These findings suggest that ECRH should be deposited at the plasma core with carefully controlled power to ensure the stable and compatible operation of ECRH and the island divertor configuration in tokamaks. The results can provide insights into achieving robust operation of an island divertor in tokamaks. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

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The 5.8 T Cryogen-Free Gyrotron Superconducting Magnet System on HL-2A

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Plasma Science and technology 2014年第4期16卷 410-414页

作者：夏冬辉黄梅周俊白兴宇郑铁流饶军庄革 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Southwestern Institute of Physics

A 5.8 T cryogen-free superconducting magnet （SCM） system with a warm bore hole of 160 mm in diameter, used for gyrotrons operating in the frequency range from 68 GHz to 140 GHz, is installed on the site of the HL-2A tokamak. The SCM consists of two separate solenoidal magnetic coils connected in series, a 4.2 K Gifford-McMahon （GM） refrigerator, a com- pressor, a coil power supply and two temperature monitors. The performance, test and preliminary experimental results of this SCM system are described in this paper. The magnetic field distribu- tion was measured along the axis, and a dummy tube was used for adjusting the magnet system. Finally, the magnet was used for the operation of a 68 GHz/500 kW gyrotron, which is part of an electron cyclotron resonance heating （ECRH） system. With an additional auxiliary coil and after adjusting tile magnet system, a maximum output power for the ECRH system of up to 400 kW was achieved.

关键词： ECRH gyrotron superconducting magnet cryogen free

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Efficiency and bandwidth improvement of integrated acousto-optic modulators using dielectric acoustic reflectors

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APL Photonics 2025年第5期10卷

作者： Liu, Huilong Huang, Jiying Jiang, Jiantao Huang, Hongyi Chen, Huipeng Chen, Chengyu La, Haiwei Li, Huan Xu, Xiaochun Chen, Yuping Li, Zhaohui Wan, Lei School of Physics Ningxia University Yinchuan750021 China Department of Electronic Engineering College of Information Science and Technology Jinan University Guangzhou510632 China State Key Laboratory of Photonics and Communications School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Extreme Photonics and Instrumentation Center for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou310058 China North Minzu University Yinchuan750030 China Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou510275 China Zhuhai519000 China

Manipulation and control of traveling surface acoustic waves (SAWs) are critical to the realization of high-performance integrated acousto-optic modulators (AOMs). In this paper, we present the chalcogenide glass (ChG) acoustic reflector-loaded thin-film lithium niobate (TFLN) Mach-Zehnder interferometer (MZI) AOMs with single-arm and single-finger configurations based on the forming mechanism of the acoustic standing wave. Through the engineering of dielectric acoustic reflectors, threefold modulation efficiency improvement is achieved for the TFLN MZI AOM with X-Z orientation, while twofold bandwidth extension is demonstrated for the counterpart with X-30°Y orientation. Propagation loss of the Rayleigh SAW around 0.85 GHz and the reflection coefficient of ChG acoustic grating are measured to be 3.04 dB/mm and 0.34, respectively. Introduction of dielectric acoustic reflectors opens a new pathway to the study of efficient and wideband acousto-optic interaction devices. © 2025 Author(s).

关键词： Light modulation

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Corrigendum to“Elastic properties of Cu–6wt%Ag alloy wires for pulsed magnets investigated by ultrasonic techniques”

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Chinese Physics B 2025年第4期34卷 625-625页

作者： Ziyu Li Tianyi Gu Wenqi Wei Yang Yuan Zhuo Wang Kangjian Luo Yupeng Pan Jianfeng Xie Shaozhe Zhang Tao Peng Lin Liu Qi Chen Xiaotao Han Yongkang Luo Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Figure 3 in the paper[***.B 34020701(2025)]contains an axis labeling *** revised figure is *** modification does not affect the result presented in the paper.

关键词： high-field magnet Cu-Ag alloy ultrasonic techniques elastic constants

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Deep Reinforcement Learning Based Bi-layer Optimal Scheduling for Microgrids Considering Flexible Load Control

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 949-962页

作者： Zitong Zhang Jing Shi Wangwang Yang Zhaofang Song Zexu Chen Dengquan Lin the State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In this paper,the bi-layer scheduling method for microgrids,based on deep reinforcement learning,is proposed to achieve economic and environmentally friendly ***,considering the uncertainty of renewable energy,the framework of day-ahead and intra-day scheduling is established,and the implementation scheme for both price-based and incentive-based demand response(DR)for the flexible load is ***,comprehensively considering the operating characteristics of the microgrid in the day-ahead and intra-day time scales,a bi-layer scheduling model of the microgrid is *** terms of algorithms,since day-ahead scheduling has no strict requirement for dispatching time,the particle swarm optimization(PSO)algorithm is used to optimize the time-of-use electricity price and distributed power output for the next *** the environmental fluctuations and requirements for rapidity of intra-day online scheduling,the deep reinforcement learning(DRL)algorithm is adopted for ***,based on the data from the actual microgrid,the rationality and effectiveness of the proposed scheduling method is *** results show that the proposed bi-layer scheduling based on the PSO and DRL algorithms achieves the optimization of scheduling cost and calculation speed,and is suitable for microgrid online scheduling.

关键词： Bi-layer optimal scheduling demand response deep reinforcement learning microgrid scheduling

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electromagnetic and Cryogenic Design of a Liquid-Helium-Free 9 T NbTi Magnet for Scanning Tunneling Microscopy

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IEEE Transactions on Applied Superconductivity 2025年

作者： Song, Yunxing Li, Jianglan Cheng, Zhiwen Liu, Mengyu Li, Xian Li, Liang Wang, Qiuliang Huazhong University of Science and Technology Wuhan National High Magnetic Field Center Wuhan 430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan 430074 China Chinese Academy of Sciences Institute of Electrical Engineering Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The strong magnetic field generated by the superconducting magnet can significantly enhance the capabilities of Scanning Tunneling Microscopy (STM) in exploring novel quantum materials, nano-magnetic systems, and topological materials. A liquid-helium-free 9 T NbTi magnet for STM has been developed at the Wuhan National High Magnetic Field Center (WHMFC) and is entirely cooled with a GM cryocooler. This magnet features five independent coils, a cold bore diameter of 95 mm, a rated operating current of 80.7 A, and a rated central magnetic field of 9.0 T. The magnetic field uniformity over a 1 cm diameter spherical volume (DSV) is 0.1%. This paper presents the electromagnetic and cryogenic design of the magnet, along with a thermal and mechanical analysis and optimization of the current leads and cooling paths. The optimized magnet system successfully reaches a temperature below 4 K. After six training quenches, the magnet was successfully ramped to and parked at 9.2 T. © 2002-2011 IEEE.

关键词： Binary Current Leads Conduction-Cooled Liquid-Helium-Free Superconducting Magnet Thermal Analysis

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Hybrid GOA and PSO optimization for load frequency control in renewable multi source dual area power systems

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Scientific Reports 2025年第1期15卷 1-40页

作者： Yameen, Muhammad Zubair Junejo, Abdul Khalique Lu, Zhigang Siddiqui, Rizwan Aziz El-Sousy, Fayez F. M. Naveed, Ibtisam Key Laboratory of Power Electronics for Energy Conservation and Drive Control of Hebei Province Yanshan University Qinhuangdao 066004 China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Department of Electrical Engineering Quaid-e-Awam University of Engineering Science and Technology Nawabshah 67450 Pakistan Department of Electrical Engineering Prince Sattam Bin Abdulaziz University Al Kharj 16273 Saudi Arabia School of Electrical Engineering Southeast University Nanjing 210096 China

The integration of unconventional power sources, such as solar, wind, and electric vehicles (EVs), into electrical power grids poses significant challenges in maintaining frequency stability and consistent tie-line power flows. These fluctuations can compromise the reliability and quality of power delivered to end-users. To address these challenges, this paper proposes a novel Proportional-Integral-Derivative (PID) controller optimized using a hybrid Grasshopper Optimization Algorithm-Particle Swarm Optimization (GOA-PSO) approach. Unlike conventional tuning methods, the proposed GOA-PSO hybridization leverages the exploratory strengths of GOA and the exploitative capabilities of PSO, resulting in an optimized control strategy that significantly enhances load frequency control (LFC) performance. This study is among the first to integrate a fuzzy-based MPPT PV system, a P&O MPPT-controlled PMSG-based wind energy system, and EVs within a single-area multi-source energy network while simultaneously addressing a dual-area interconnected power system (IPS). The GOA-PSO-PID controller is fine-tuned using the Integral Time Absolute Error (ITAE) as a fitness function to enhance control efficiency. The controller’s effectiveness is evaluated across two distinct cases: (1) a single-area system integrating thermal, solar, wind, and EV resources, and (2) a two-area thermal tie-line interconnected power system. Comparative studies across various operational scenarios, including extensive parameter variations (± 40%) and load fluctuations, demonstrate the superior performance of the GOA-PSO-PID controller over the conventional PSO-PID approach. The GOA-PSO-PID achieves a 79.95% reduction in overshoot, a 92.78% reduction in undershoot, and a 98.91% improvement in settling time in the single-area system. Similarly, in the dual-area IPS, it provides a 76.73% reduction in overshoot, an 87.62% reduction in undershoot, and a 75.68% improvement in rise time. These findings highlight the

关键词： Dual-area power network Electric vehicle GOA ITAE LFC PID controller PSO

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Effect of oxygen doping sources on enhancing air stability and lithium metal compatibility of Li 5.5 PS 4.5 Cl 1.5 electrolyte

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Chinese Chemical Letters 2025年

作者： Linfeng Peng Cong Liao Jiayue Peng Shuai Chen Tianyu Lei Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

Oxygen (O) doping is a promising strategy for enhancing the air stability and lithium metal compatibility of sulfide solid electrolytes (SSEs). However, the impact of various O sources on the structure and properties of SSEs remains unclear. In this study, we synthesized a series of O-doped electrolytes, Li5.5PS4.5-xOxCl1.5 (LPSCOx, 0.1 ≤ x ≤ 0.5), using Li2O and P2O5 as O sources, and systematically investigated their differences in structure, air stability, and electrochemical properties. O preferentially substitutes sulfur (S) at the 16e site and begins to replace S at the 4d site once a certain O concentration is reached. Notably, the P2O5-doped electrolytes (P-LPSCOx) exhibit a greater oxygen tolerance content (0.24) at the 16e site, along with better air stability, higher ionic conductivity, and superior lithium metal compatibility. XRD, SEM, and XPS analyses reveal that the P2O5-doped electrolytes exhibit larger cell parameters, higher densification, and fewer side reactions with lithium metal compared to the Li2O-doped counterparts. This study provides valuable insights into the development of high-performance O-doped sulfide electrolytes.

关键词：

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A novel flexible plasma array for large-area uniform treatment of an irregular surface

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Plasma Science and technology 2022年第3期24卷 130-137页

作者： Baowang LIU Fei QI Dejiang ZHOU Lanlan NIE Yubin XIAN Xinpei LU State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic

In this work,we demonstrate a flexible multi-pin plasma generator with movable electrodes,which can change the shape of the electrode array freely,and then provide a large-area uniform plasma for the treatment of surfaces of different *** characteristics including U-I waveforms and discharge images and sterilization performance under three different electrode configurations(flat-flat,flat-curve,curve-curve)are *** similar results are acquired between the flat-flat configuration and the curve-curve configuration,which is much better than that under flat-curve *** flexible multi-pin plasma generator offers a simple method to treat different irregularly shaped surfaces uniformly with a single ***,this device provides a foundation for developing a self-adaption large-scale uniform plasma generator by further introducing automatic adjustment of the position of every electrode driven by motors with discharge current feedback in the following *** it will promote the applications of atmospheric-pressure cold plasmas significantly.

关键词： flexible multi-pin electrode large-area uniform plasma sterilization

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Analysis on Circulating Current and Split Capacitor Voltage Balance for Modular Multilevel Converter Based Three-phase Four-wire Split Capacitor DSTATCOM

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 657-667页

作者： Lei Lin Jialu He Chen Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

We propose a modular multilevel converter(MMC)based three-phase four-wire(3P4W)split capacitor distribution static synchronous compensator(DSTATCOM),aiming at compensating unbalanced and reactive load *** to the zero-sequence current compensation,the circulating current char-acteristics of 3P4W MMC-DSTATCOM are different from conventional ***,the distinct working principle of IMMC would affect the features of split capacitor *** decoupled positive-,negative-and zero-sequence second-order and DC components of the circulating current are deduced *** proportional-integral controllers with dual dq transformation are employed to suppress the positive-and negative-sequence components of second-order circulating current,while quasi proportional-resonance controller is designed to eliminate the zero-sequence ***,the phenomenon of the unbalanced split capacitor voltages is revealed,and fast-tracking balancing method by controlling zero-sequence current flowing through the split capacitors is *** simulation results verify the accuracy of the analysis and the feasibility of the suppression methods.

关键词： Circulating current modular multilevel converter(MMC) distribution static synchronous compensator(DSTATCOM) split capacitor three-phase four-wire(3P4W)

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