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Design and first result of combined Langmuir-magnetic probe on J-TEXT tokamak

Plasma Science and technology 2022年第5期 47-55页

作者：杨庆虎陈志鹏郝志刚赵扬明徐鑫李述豪阳杰严伟江中和陈忠勇王能超杨州军潘垣丁永华 the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

In order to measure boundary electrostatic and magnetic fluctuations simultaneously, a combined Langmuir-magnetic probe(CLMP) has been designed and built on joint-Texas experimental tokamak. The probe consists of 8 graphite probe pins and a 3D magnetic probe, driven by a mechanical pneumatic device. By means of simulation, the shielding effect of the graphite sleeve on the magnetic fluctuation signal is explored, and the influence of the eddy current was reduced by cutting the graphite sleeve. In the experiment, it has been verified that the mutual inductance of electromagnetic signals can be ignored, and a 70–90 k Hz electromagnetic mode is observed around the last closed magnetic surface. The establishment of CLMP provides data for the exploration of the coupling of electrostatic and magnetic fluctuations.

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Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters

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Chinese Journal of Electrical engineering 2019年第3期5卷 1-9页

作者： Qiqi Li Bangyin Liu Shanxu Duan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

A practical analytical model to calculate the switching loss of cascode gallium nitride high electron mobility transistors(GaN HEMTs)is *** facilitate analysis and application,the transmission delays introduced by Si MOSFET and interconnection inductances are ignored in ***,the nonlinear junction capacitances of the device and circuit stray inductances are also incorporated to increase the accuracy of the *** turn-on and turn-off switching processes are described in detail and the simplified equations can be easily solved by using mathematical *** on the analytical model,loss evaluation of totem-pole PFC converter is introduced ***,the accuracy of the model is validated by comparing the calculated loss and converter’s efficiency with experiment *** efficiency of 99.26%is achieved for a 3.6 kW single phase CCM Totem-Pole PFC AC/DC converter switching at 50 kHz based on 650 V cascode GaN HEMTs.

关键词： Analytical model cascode GaN HEMTs totem-pole PFC efficiency evaluation

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Dynamic microstructure evolution and mechanical properties of dilute Mg-Al-Ca-Mn alloy during hot rolling

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Journal of Materials Science & technology 2022年第34期129卷 1-14页

作者： Shiwei Xu Congcong Zhu Zhanhong Lin Chen Jin S.Kamado K.Oh-ishi Yun Qin College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Qinghai Salt Lake Teli Magnesium Co.Ltd. Xining 810000China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan Toyota Central R&D Labs. Inc.41-1 YokomichiNagakuteAichi 480-1192Japan Research Institute(R&D Centre) Baowu Steel Group CorporationShanghai 201900China

The dynamic microstructure and texture of dilute Mg-0.50Al-0.71Ca-0.33Mn(wt.%) during hot rolling at two slab temperatures were investigated by electron backscattered diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM). The results show that the development of the rolling microstructures is to first form {10–12} extension twins in the original grains, thereby forming the extension-twinned regions, and then to further form {10–11}-{10–12} double twins and kinks in the extension-twinned regions, and finally to form continuous dynamic recrystallized(continuous DRXed)grains in the double twins and the cross parts of the shear-deformed coarse extension-twinned *** extension twins, double twins and kinks show a decisive effect on the formation of rolling *** number of {10–11}-{10–12} double twins and resultant the continuous DRX process are strongly affected by the rolling slab temperature and the reduction thickness per pass. By optimizing the rolling conditions, texture and microstructures of the multi-pass rolled Mg-Al-Ca-Mn alloy sheets are successfully modified. Although the total alloy content is only 1.5 wt.%, these Mg-Al-Ca-Mn alloy sheets show much higher strength than the commercial Mg-3Al-1 Zn(wt.%)(AZ31B) sheet.

关键词： Mg-Al-Ca-Mn alloy Hot rolling Dynamic recrystallization Texture control Mechanical properties

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VLSI Quantum Graph Photonics

VLSI Quantum Graph Photonics

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Fu, Z. Bao, J. Pramanik, T. Mao, J. Chi, Y. Cao, Y. Zhai, C. Mao, Y. Dai, T. Chen, X. Jia, X. Zhao, L. Zheng, Y. Tang, B. Li, Z. Luo, J. Wang, W. Yang, Y. Peng, Y. Liu, D. Dai, D. He, Q. Muthali, A. Oxenløwe, L. Vigliar, C. Paesani, S. Hou, H. Santagati, R. Silverstone, J. Laing, A. Thompson, M. O'Brien, J. Ding, Y. Gong, Q. Wang, J. State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China State Key Laboratory for Modern Optical Instrumentation College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou310058 China Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. Lyngby2800 Denmark Niels Bohr Institute University of Copenhagen Blegdamsvej 17 CopenhagenDK-2100 Denmark Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1FD United Kingdom Department of Physics The University of Western Australia Perth6009 Australia

ISBN: (纸本)9781957171258

We report a graph-based very-large-scale-integrated silicon-photonic quantum chip. Having the correspondence between quantum chip and graph theory, we demonstrate the generation of multiphoton multidimensional entanglement and determination of modulus-squared Hafnian (Permanent) of graph's adjacency matrices. © Optica Publishing Group 2023 © 2023 The Author(s)

关键词： Silicon photonics

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Deformation of invariant tori under perturbation

arXiv

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arXiv 2024年

作者： Wei, Wenyin Hua, Jiankun Knieps, Alexander Liang, Yunfeng Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management – Plasma Physics Jülich52425 Germany International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

This study extends the functional perturbation theory (FPT) of dynamical systems, which was initially developed for investigating the shifts of magnetic field line trajectories within the chaotic edge region of plasma when subjected to global perturbations. By contrast, invariant tori reside in the ordered regions of phase space. In magnetic confinement fusion (MCF) devices, these tori manifest as closed flux surfaces, with their nested structure governing radial transport and thus playing a critical role in confinement performance. Using the method of variation as a mathematical foundation, this Letter derives formulae that characterize the deformation of invariant tori under perturbation. These results provide new tools for targeted topology control in tokamak operations and for optimizing stellarator designs by enhancing predictive capability for flux surface *** Codes Primary: 37D10, Secondary: 34D10, 37N05, 37N10, 37M21, 37J40, 39A33, 39B52, 76W05, 78M30 Copyright © 2024, The Authors. All rights reserved.

关键词： Perturbation techniques

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On the shifts of stable and unstable manifolds of a hyperbolic cycle under perturbation

arXiv

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arXiv 2024年

作者： Wei, Wenyin Hua, Jiankun Knieps, Alexander Liang, Yunfeng Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung - Plasmaphysik Jülich52425 Germany International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Stable and unstable manifolds, originating from hyperbolic cycles, fundamentally characterize the behaviour of dynamical systems in chaotic regions. This letter demonstrates that their shifts under perturbation, crucial for chaos control, are computable with minimal effort using functional derivatives by considering the entire system as an argument. The shifts of homoclinic and heteroclinic orbits, as the intersections of these manifolds, are readily calculated by analyzing the movements of the intersection *** Codes Primary: 37D10, Secondary: 39A33, 39B52, 76W05, 78M30 Copyright © 2024, The Authors. All rights reserved.

关键词： Dynamical systems

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A Novel Resonant Frequency Tracking Control for Linear Compressor Based on MRAS Method

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CES Transactions on Electrical Machines and Systems 2020年第3期4卷 227-236页

作者： Wei Xu Qizhe Wang Xiang Li Yi Liu Jianguo Zhu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China School of Electrical and Information Engineering University of SydneySydneyNSW 2006Australia

To optimize the efficiency of the linear compressor,its operating frequency must be controlled equal to the system resonant *** traditional resonant frequency tracking control algorithm relies on the steady state characteristics of the system,which suffers from slow convergence speed,low accuracy and slow system *** order to solve these problems,a novel resonant frequency tracking control for linear compressor based on model reference adaptive system(MRAS)is proposed in this paper,and the parameter adaptive rate is derived by the Popov's hyperstability theory,so that the system resonant frequency can be directly calculated through the parameter adaptive ***,the traditional algorithm needs to calculate the piston stroke signal by integrating the back-EMF,which has the problem of integral *** algorithm proposed in this paper only needs the velocity signal,and the accuracy of the velocity calculation can be ensured by utilizing the self-adaptive band-pass filter(SABPF),thereby greatly improving the accuracy of the resonance frequency *** results verify the effectiveness of the proposed algorithm.

关键词： linear compressor linear oscillating motor(LOM) resonant frequency tracking control model reference adaptive system(MRAS)

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Hybrid thin-film lithium niobate micro-ring acousto-optic modulator for microwave-to-optical conversion

arXiv

引用

arXiv 2024年

作者： Wan, Lei Huang, Jiying Wen, Meixun Li, Huan Zhou, Wenfeng Yang, Zhiqiang Chen, Yuping Liu, Huilong Zeng, Siqing Liu, Dong Yang, Shuixian Dai, Daoxin Li, Zhaohui 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 Extreme Photonics and Instrumentation Center for Optical & Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Zijingang Campus Hangzhou310058 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou510275 China Zhuhai519000 China

Highly efficient acousto-optic modulation plays a vital role in the microwave-to-optical conversion. Herein, we demonstrate a hybrid thin-film lithium niobate (TFLN) racetrack micro-ring acousto-optic modulator (AOM) implemented with low-loss chalcogenide (ChG) waveguide. By engineering the electrode configuration of the interdigital transducer, the double-arm micro-ring acousto-optic modulation is experimentally confirmed in nonsuspended ChG loaded TFLN waveguide platform. Varying the position of blue-detuned bias point, the half-wave-voltage-length product VπL of the hybrid TFLN micro-ring AOM is as small as 9 mV·cm. Accordingly, the acousto-optic coupling strength is estimated to be 0.48 Hz s1/2 at acoustic frequency of 0.84 GHz. By analyzing the generation of phonon number from the piezoelectric transducer, the microwave-to-optical conversion efficiency is calculated to be 0.05%, approximately one order of magnitude larger than that of the state-of-the-art suspended counterpart. Efficient microwave-to-optical conversion thus provides new opportunities for low-power-consumption quantum information transduction using the TFLN-ChG hybrid piezo-optomechanical devices. © 2024, CC BY.

关键词： Thin films

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Turning a hot spot into a cold spot:polarization-controlled Fano-shaped local-field responses probed by a quantum dot

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Light(Science & Applications) 2020年第1期9卷 417-428页

作者： Juan Xia Jianwei Tang Fanglin Bao Yongcheng Sun Maodong Fang Guanjun Cao Julian Evans Sailing He Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical InstrumentationNational Engineering Research Center for Optical InstrumentationJORCEPCollege of Optical Science and EngineeringZhejiang University310058 HangzhouChina School of Physics Huazhong University of Science and Technology430074 WuhanChina Centre for Optical and Electromagnetic Research ZJU-SCNU Joint Center of PhotonicsSouth China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouChina Department of Electromagnetic Engineering School of Electrical EngineeringRoyal Institute of TechnologyS-10044 StockholmSweden

Optical nanoantennas can convert propagating light to local *** local-field responses can be engineered to exhibit nontrivial features in spatial,spectral and temporal domains,where local-field interferences play a key ***,we design nearly fully controllable local-field interferences in the nanogap of a nanoantenna,and experimentally demonstrate that in the nanogap,the spectral dispersion of the local-field response can exhibit tuneable Fano lineshapes with nearly vanishing Fano dips.A single quantum dot is precisely positioned in the nanogap to probe the spectral dispersions of the local-field *** controlling the excitation polarization,the asymmetry parameter q of the probed Fano lineshapes can be tuned from negative to positive values,and correspondingly,the Fano dips can be tuned across a broad spectral ***,at the Fano dips,the local-field intensity is strongly suppressed by up to ~50-fold,implying that the hot spot in the nanogap can be turned into a cold *** results may inspire diverse designs of local-field responses with novel spatial distributions,spectral dispersions and temporal dynamics,and expand the available toolbox for nanoscopy,spectroscopy,nano-optical quantum control and nanolithography.

关键词： quantum local dispersion

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A method for power system transient stability assessment based on transfer learning

A method for power system transient stability assessment bas...

引用

2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Ren, Junyu Chen, Jinfu Li, Benyu Zhao, Ming Shi, Hengchu You, Hao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center Kunming China

ISBN: (纸本)9781728155081

Traditional machine learning models are subject to changes in the data distribution. Once the topology of power grid changes, the distribution of power grid data will change, resulting in the consequence that the former transient stability assessment model based on machine learning is no longer applicable and needs to be retrained. However, the power network after the topology changes cannot provide enough data for the training of the new model. To solve the problem above, this paper proposes a method of power system transient stability assessment based on transfer learning, which fully taps the potential of past data and assists a small amount of newly acquired data in training the model. The simulation results on the CEPRI36 system show that the proposed method can effectively improve the accuracy of original classification models, especially for weak classifiers with insufficient generalization ability. The disadvantage of transfer learning lies in the long training time, which still needs to be improved. © 2020 IEEE.

关键词： Topology

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