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Experimental evidence of aligning the m = 2/1 locked mode by RMP for improvement of mode suppression efficiency with electron cyclotron wave on J-TEXT

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The European Physical Journal Special Topics 2025年 1-15页

作者： Fang, Jiangang Chen, Zhongyong Yan, Wei Wang, Nengchao Mao, Feiyue Xuan, Zijian Ren, Zhengkang Chen, Xixuan Xia, Donghui Yang, Zhoujun Chen, Zhipeng Ding, Yonghua 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 Wuhan People’s Republic of China

Stabilization of tearing modes, neoclassical tearing modes, and the locked modes (LMs) are of great importance for the tokamak plasma operation. The LMs will lead to the degradation of plasma confinement, which may cause major disruptions. The m/n = 2/1 LM islands have been completely suppressed by combination of electron cyclotron wave (ECW) and the externally applied resonant magnetic perturbation (RMP) on J-TEXT. The RMP is employed to control the phase of the 2/1 LMs and align the island’s O-point with the ECW deposition region. The J-TEXT experiment indicates that the 2/1 LM island suppression strategy can reduce the ECW power required for the mode suppression compared the suppression strategy when the island is rotating. Local heating within the magnetic island plays dominant roles on the mode suppression. The electron temperature information inside the magnetic island is provided by the electron cyclotron emission imaging diagnostic when the island is locked by RMP. The experimental results show that the temperature perturbation at the island’s O-point is larger when the island’s O-point is locked at the ECW deposition position than that when the mode is rotating. The effect of the RMP phase on the 2/1 LM suppression by ECW have been investigated. The LM suppression is most effective when the ECW power is properly aligned with the island’s O-point. Disruption avoidance by the suppression of the 2/1 LMs using ECW has been achieved on J-TEXT.

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Research on the effect of non-resonant magnetic perturbations on low-q limit in J-TEXT tokamak 48

Research on the effect of non-resonant magnetic perturbation...

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48th European Physical Society Conference on Plasma Physics, EPS 2022

作者： He, Y. Li, D. Jiang, Z.H. Ding, Y.H. Wang, N.C. Ren, Z.K. 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

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Transient Synchronization Stability Analysis and Assessment of DFIG System Under Severe Faults

arXiv

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arXiv 2025年

作者： Xu, Hongsheng Zhan, Meng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

In the transient stability analysis of renewable energy grid-tied systems, although a large amount of works have devoted to the detailed electromagnetic transient simulation and the stability analyses of during-fault stage, the whole low-voltage ride through (LVRT) process and relevant transient stability mechanism remain to be uncovered. Taking the doubly fed induction generator system as the objective, this paper divides the transient processes into four different stages, including the pre-fault, during-fault, early post-fault, and late post-fault ones, establishes the full mechanism models for each stage, and studies the switching dynamics in detail. It is found that the during-fault dynamics can be determined by the phase-lock loop second-order equation within the framework of the generalized swing equation (GSE). For the early post-fault stage, it can be treated as a series of quasi-steady states and its dominant driving system dynamics can still be described by the GSE. Based on the local dynamics of unstable equilibrium point, the system transient stability can be completely determined by whether the initial state of the early post-fault stage is within or out of its basin of attraction (BOA). Based on these observations, the BOA-based and equal area criterion (EAC)-based transient stability assessment methods are developed, which are supported by broad numerical simulations and hardware-in-the-loop experiments. This work provides a clear physical picture and perfectly solves the difficult stability analysis problem when severe faults and LVRT have to be considered in most of DFIG engineering situations. Copyright © 2025, The Authors. All rights reserved.

关键词： Transient stability

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The experimental study of the tearing mode stability with changing the mode frequency by rotating RMPs in J-TEXT 48

The experimental study of the tearing mode stability with ch...

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48th European Physical Society Conference on Plasma Physics, EPS 2022

作者： Jia, Ruo Li, Da Ding, Yonghua Wang, Nengchao Ren, Zhengkang Mao, Feiyue He, Ying 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 paper presents the recent experimental results in J-TEXT to study tearing mode (TM) characteristics with the application of rotating resonant magnetic perturbation (RRMP). After applying the RRMP, the TM frequency was changed until the mode was locked on the RRMP. It's found that, statistically, the variation of TM amplitude has negative correlation with the variation of frequency. The amplitude tends to a larger constant saturation value with the decrease of frequency, while the amplitude variation has linear inverse correlation with the frequency deceleration. The results also provide proof and explanation on RRMP suppressing TM. © 2022 48th EPS Conference on Plasma Physics, EPS 2022. All rights reserved.

关键词： Magnetic resonance

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A numerical model of directional couplers for ECRH systems and its validation 3

A numerical model of directional couplers for ECRH systems a...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Xu, Dengfeng Weng, Wenting He, Sifen Xia, Donghui Wang, Zhijiang Pan, Yuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Real-time power measurement of the Electron Cyclotron (EC) wave is essential for the Electron Cyclotron Resonance Heating (ECRH) system operation. Directional couplers integrated into the miter bend can realize real-time EC wave power measurement. To monitor the operating status of the ECRH system, we need to design directional couplers. In the design process, a numerical model and corresponding program have been developed. To validate the reliability of the model, 23-hole and 27-hole directional couplers have been designed and high-power tests at the frequency of 105 GHz have been carried out. Deviations between the measured coupling coefficients and the theoretical values are about 0.6 dB and 5 dB, respectively. Within the error range allowed, these two directional couplers show high performance in agreement with theory and can reflect power changes accurately. The established numerical model is proved to be reliable and feasible. © 2022 IEEE.

关键词： Numerical models

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Finite element analysis of pile expansion by shock wave of metal wire explosion in liquids

Finite element analysis of pile expansion by shock wave of m...

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China International Electrical and Energy Conference (CIEEC)

作者： Yi Liu Shijie Huang Yong Zhao Youlai Xu Tianyu Wang Fuchang Lin Hua Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology & Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Wuhan China

Construction of specially shaped pile foundations by compacting the soil around the borehole with shock waves, which can effectively increase the load-bearing capacity of the pile material. The metal wire explosion in liquid has the advantages of high energy efficiency, good repeatability and controllability. The strong shock wave generated by the explosion can compress the soil to enlarge the size of pile foundations and construct shaped pile foundations, which has industrial prospects. In order to analyze the mechanism of pile expansion by metal wire explosion in liquid, a test platform was established, and parameters such as discharge voltage, current and energy were obtained. Based on the dynamic analysis software Ls-dyna, a two-dimensional simulation model of the shock wave generated by explosion in liquid acting on the soil was established, and the material parameters and model dimensions were reasonably determined. The propagation and attenuation processes of shock waves in cement slurry and soil were numerically simulated. The cumulative effect of pile foundation expansion under the action of multiple shock waves was analyzed, and compared with the test results.

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Formation studies of field-reversed configurations on the HFRC-F device 48

Formation studies of field-reversed configurations on the HF...

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48th European Physical Society Conference on Plasma Physics, EPS 2022

作者： Peng, Yue Rao, Bo Yang, Yong Zhang, Ming Wang, Zhijiang Pan, Yuan 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

Collisional-merging is a way to form high-performance field-reversed configuration (FRC) plasma. To improve the properties of merged plasma, one feasible way is to optimize the formation process. An experimental device named HFRC-F has been constructed in Huazhong University of Science and technology, which is used to investigate the field reversed theta-pinch (FRTP) formation process of FRCs. Initial HFRC-F experiments obtain typical parameters with plasma density of 4 ×1020 m-3 and lifetime of 75 μs with Bbias = -0.015 T, BPI = 0.015 T and Bmain = 0.035 T. The results also show that, 1) the larger the main magnetic field, the higher the density. 2) the VPI should be appropriate to obtain a larger frozen magnetic flux. © 2022 48th EPS Conference on Plasma Physics, EPS 2022. All rights reserved.

关键词： Plasma density

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Lines-based rotating beam profiling algorithm using pixel ionization chamber with dead pixels

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Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2023年 1046卷

作者： Lin, Yinjie Tan, Ping Lei, Hao Li, Jiadong Hu, Delin Li, Dong Zhang, Zhongqi State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

In a pencil beam scanning proton therapy system, critical beam parameters, including the spot size, spot center position, and tilt angle, are monitored for security by beam profile detectors such as two-dimensional (2D) pixel-segmented ionization chambers. A method, named lines-based beam profiling (LBBP), is proposed to identify the five geometric parameters μx,μy,σx,σy,θ of rotating elliptical beam profiles using several lines (rows and columns) in the 2D detector data. The method provides solid results even in the presence of dead pixels, which can be located using a wavelet analysis. Simulation experiments were used to define the number of lines used by the LBBP method and to characterize its performance as a function of the signal-to-noise (SNR). For SNR greater than 30, the root mean square errors (RMSEs) of the beam spot size, spot center position, and rotation angle obtained with the LBBP method are less than 0.16 mm, 0.05 mm, and 0.78 degrees, respectively. The LBBP method was applied to the data collected by a pixel chamber illuminated by an X-ray source, demonstrating the capability of identifying dead pixels and providing more accurate measurements of the beam spot size and center position than the standard Gaussian fitting. © 2022 Elsevier B.V.

关键词： Pixels

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Measurement of the phase relationship of coupled n = 1 tearing modes in J-TEXT 48

Measurement of the phase relationship of coupled n = 1 teari...

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48th European Physical Society Conference on Plasma Physics, EPS 2022

作者： Ren, Z. Ding, Y. Wang, N. Shen, C. Li, D. He, Y. Mao, F. 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

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Integrated multi-mode glass ceramicﬁber for high-resolution temperature sensing

Advanced Powder Materials

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advanced Powder Materials 2023年第4期2卷 54-62页

作者： Yongsheng Sun Meihua Chen Puxian Xiong Yuzhen Wang Shuhang Tian Qingquan Jiang Yao Xiao Hongyou Zhou Peishan Shao Qiuqiang Zhan Jiulin Gan Qi Qian Dongdan Chen Zhongmin Yang School of Materials Science and Engineering School of Physics and OptoelectronicsState Key Laboratory of Luminescent Materials and DevicesInstitute of Optical Communication MaterialsGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesAnd Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510641China Centre for Optical and Electromagnetic Research National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsMOE Key Laboratory&Guangdong Provincial Key Laboratory of Laser Life ScienceSouth China Normal UniversityGuangzhou 510631China

Optical temperature sensors,which can accurately detect temperature in biological systems,are crucial to the development of healthcare *** challenge the state-of-art technology,it is necessary to design single luminescence center doped materials with multi-wavelength emission for optical temperature sensors with more modes and higher ***,an Er^(3+)single-doped KYF4 nanocrystals glass ceramic with an obvious thermochromic phenomenon is reported for theﬁrst time,which shows a different temperature-dependent green,red,and near-infrared luminescence behavior based on thermal disturbance *** addition,Er^(3+)single-doped GCﬁber was drawn and fabricated into multi-mode opticalﬁber temperature sensor,which has superior measured temperature resolution(<0.5℃),excellent detection limit(0.077℃),and high correlation coefﬁcient(R^(2))of *** importantly,this sensor can monitor temperature in different scenarios with great environmental interference resistance and *** results indicate that our sensor shows great promise as a technology for environmental and healthcare monitoring,and it provides a route for the design of opticalﬁber temperature sensors with multi-mode and high resolution.

关键词： Er^(3+) Glass ceramic Thermochromic Opticalﬁber sensor Healthcare monitoring

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