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Plasma Science and Technology 2024年第3期26卷 1-9页

作者：李恭顺张涛耿康宁文斐叶凯萱徐立清朱翔张学习钟富彬周振杨书琪周子强喻琳兰婷王守信提昂张寿彪刘海庆李国强高翔 the EAST Team Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China

In this paper we present a new experimental observation using a conventional reflectometry technique,poloidal correlation reflectometry(PCR),in the Experimental Advanced Superconducting Tokamak(EAST).The turbulence spectrum detected by the PCR system exhibits an asymmetry and induced Doppler shift f_(D)during the internal kink mode(IKM)rotation *** Doppler shift f_(D)is the target measurement of Doppler reflectometry,but captured by conventional *** show that the Doppler shift f_(D)is modulated by the periodic changes in the effective angle between the probing wave and cutoff layer normal,but not by plasma *** fishbone mode and saturated long-lived mode are typical IKMs,and this modulation phenomenon is observed in both ***,the value of the Doppler shift f_(D)is positively correlated with the amplitude of the IKM,even when the latter is ***,the positive and negative frequency components of the Doppler shift f_(D)can be asymmetric,which is related to the plasma configuration.A simulated analysis is performed by ray tracing to verify these *** results establish a clear link between f_(D)and IKM rotation,and are helpful for studying the characteristics of IKM and related physical phenomena.

关键词： microwave reflectometry Doppler shift internal kink mode

Experimental study of core MHD behavior and a novel algorithm for rational surface detection based on profile reflectometry in EAST

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Plasma Science and Technology 2024年第3期26卷 66-75页

作者：叶凯萱周振张涛马九阳王嵎民李恭顺耿康宁吴茗甫文斐黄佳张洋邵林明杨书琪钟富彬高善露喻琳周子强向皓明韩翔张寿彪李国强高翔 the EAST Team Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China Hebei Key Laboratory of Compact Fusion Langfang 065001Peoples Republic of China ENN Science and Technology Development Co. Ltd.Langfang 065001Peoples Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China

Microwave reflectometry is a powerful diagnostic that can measure the density profile and localized turbulence with high spatial and temporal resolution and will be used in ITER,so understanding the influence of plasma perturbations on the reflect signal is *** characteristics of the reflect signal from profile reflectometry,the time-of-flight(TOF)signal associated with the MHD instabilities,are investigated in *** a 1D full-wave simulation code by the Finite-DifferenceTime-Domain(FDTD)method,it is well validated that the local density flattening could induce the discontinuity of the simulated TOF signal and an obvious change of reflect *** TOF signals under different types of MHD instabilities(sawtooth,sawtooth precursors and tearing mode)are studied in detail and show agreement with the *** new improved algorithms for detecting and localizing the radial positions of the low-order rational surface,the cross-correlation and gradient threshold(CGT)method and the 2D convolutional neural network approach(CNN)are presented for the first *** is concluded that TOF signal analysis from profile reflectometry can provide a straightforward and localized measurement of the plasma perturbation from the edge to the core simultaneously and may be a complement or correction to the q-profile control,which will be beneficial for the advanced tokamak operation.

关键词： MHD instabilities profile reflectometry rational surface detection convolutional neural network(CNN) EAST tokamak

Preliminary Study of the Magnetic Perturbation Effects on the Edge Density Profiles and Fluctuations Using Reflectometers on EAST

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Plasma Science and Technology 2016年第9期18卷 879-883页

作者： GAO Yu WANG Yumin zhang Tao zhang shoubiao QU Hao MAN Xiang WEN Fei KONG Defeng HUANG Canbin CAI Jianqing SUN Youwen LIANG Yunfeng GAO Xiang EAST Team University of Science and Technology of China Hefei 230026 China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China 3IEK-4 Forschungszentrum Jiilich Association EURATOM-FZJ 52425 Jiilich Germany

The resonant magnetic perturbation （RMP） coils have been successfully designed and installed on the Experimental Advanced Superconducting Tokamak （EAST）. Using the reflectometer systems, the density profile and the density fluctuations during magnetic perturbations （MPs） phase have been investigated. During the experiments, two different cases are studied separately： steady MPs and rotating MPs. In both cases, a strongly density pump-out has been observed. In the steady MPs cases, an enhancement of the low frequency （〈60 kHz） density fluctuations in H-mode phase has been observed. The plasma density boundary out-shifts 5~ caused by the MPs. The pedestal density gradient is reduced by 50%, while the radial location nearly stays unchanged. In the rotating MPs, the line-averaged density, the D~ emission at the divertor region and the spectrum of the density fluctuations are modulated. The results suggest that the low frequency （〈60 kHz） density fluctuations may contribute to the strong density pump-out.

关键词： magnetic perturbations microwave reflectometer density profile densityfluctuation tokamak

Feasibility of applying the lower cut-off frequency for the density radial coverage extension in EAST reﬂectometry measurement

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Plasma Science and Technology 2022年第5期24卷 112-117页

作者： Jia HUANG Xiang HAN Kaixuan YE Tao zhang Fei WEN Mingfu WU Kangning GENG Gongshun LI Fubin ZHONG Yukai LIU Haoming XIANG Shuqi YANG shoubiao zhang Xiang GAO Ge ZHUANG the EAST Team University of Science and Technology of China Hefei 230026People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China

The extraordinary mode(X-mode)lower cut-off frequency is proposed for use in the reflectometry diagnostic on ITER for the electron density profile measurement,which is a trade-off between extreme plasma parameters and the accessible probing *** contemporary experiments,the lower cutoff frequency can be identified at the probing frequency below the electron cyclotron frequency(f_(ce)) under certain plasma *** provide here,for the first time,the experimental validation of the use of the lower cut-off frequency for the density profiles via the reflectometry measurement on *** corresponding group delay of the lower cut-off frequency evolves continuously with the upper one,revealing a reasonable radial coverage extension of reflectometry measurement toward the plasma *** is concluded that the lower cut-off frequency can be used as a supplement to the upper one in the density profile inversion process,which is of particular interest in the high magnetic field and/or density discharge to extend the radial coverage of reflectometry measurement.

关键词： X-mode reflectometry density profile EAST lower cut-off frequency

Experimental study of double tearing mode on EAST tokamak

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Plasma Science and Technology 2020年第2期22卷 47-53页

作者： Mingfu WU Zixi LIU Tao zhang Fubin ZHONG Gongshun LI Haoming XIANG Kangning GENG Kaixuan YE Jia HUANG Fei WEN Yumin WANG Xiang HAN shoubiao zhang Haiqing LIU Guoqiang LI Ge ZHUANG Xiang GAO University of Science and Technology of China Hefei 230026People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People’s Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China

The double tearing mode(DTM)in a high βN(βN>1.5)discharge with internal transport barrier on EAST was investigated.A 15 kHz tearing mode(TM)(m≥3,n=3)appears at outer q=2 surface at first,which is stable in the highβN *** a 2 kHz TM(m=2,n=1)occurs at inner q=2 *** after,high βN collapsed with the crash of ELM,and DTM formed during the collapse of β*** positions of the two islands of the DTM are consistent with the q=2 *** temperature fluctuations are the strongest between the two magnetic islands.A statistical analysis of high βN discharges operating with the reversed magnetic shear configuration in the EAST 2015-2018 campaign revealed the existence of the DTM in many *** the DTM phase,all βN are reduced by 10%-30% within 0.1 ***,there are two different βN behaviors thereafter-with and without βN *** the physical mechanism of βN recovery during the DTM phase will benefit steady-state operation with reversed shear configurations in the future.

关键词： highβN βN collapse EAST double tearing mode

Experimental study of density pump-out on EAST

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Plasma Science and Technology 2017年第1期19卷 36-43页

作者： Shouxin WANG Haiqing LIU Yinxian JIE Qing ZANG Bo LYU Tao zhang Long ZENG shoubiao zhang Nan SHI Ting LAN Zhiyong ZOU Weiming LI Yuan YAO Xuechao WEI Hui LIAN Gen LI Handong XU Xinjun zhang Bin WU Youwen SUN EAST Team Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hefei 230026 People's Republic of China Tianjin University of Technology Tianjin 300384 People's Republic of China

In the experimental advanced superconducting tokamak,density pump-out phenomena were observed by using a multi-channel polarimeter-interferometer system under different heating schemes of ion cyclotron resonant heating,electron cyclotron resonance heating,and neutral beam *** density pump-out was also induced with application of resonant magnetic perturbation,accompanied with a degradation of particle *** the comparison analysis in all heating schemes,the typical plasma parameters are plasma current 400 k A,toroidal field 2 T,and line average density 2×10^19m^-*** experimental results show that the degree of pump-out is concerned with electron density and heating *** density deuterium low confinement（L-mode） plasmas（〈3.5×10^19m^-3） show strong pump-out *** density pump-out correlated with a significant drop of particle confinement.

关键词： density pump-out particle confinement ECRH ICRF NBI RMP

Investigation of the compact torus plasma motion in the KTX-CTI device based on circuit analyses

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Plasma Science and Technology 2022年第2期24卷 36-44页

作者： Qilong DONG Defeng KONG Xiaohe WU Yang YE Kun YANG Tao LAN Chen CHEN Jie WU Sen zhang Wenzhe MAO Zhihao ZHAO Fanwei MENG Xiaohui zhang Yanqing HUANG Wei BAI Dezheng YANG Fei WEN Pengfei ZI Lei LI Guanghai HU shoubiao zhang Ge ZHUANG School of Science Shihezi UniversityShihezi 832003People's Republic of China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People's Republic of China School of Computer Science and Information Engineering Hefei University of TechnologyHefei 230009People's Republic of China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008People's Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People's Republic of China

Compact torus(CT)injection is one of the most promising methods for the central fuelling of next-generation reactor-grade fusion devices due to its high density,high velocity,and selfcontained magnetised structure.A newly compact torus injector(CTI)device in Keda Torus e Xperiment(KTX),named KTX-CTI,was successfully developed and tested at the University of Science and Technology in *** this study,first,we briefly introduce the basic principles and structure of KTX-CTI,and then,present an accurate circuit model that relies on nonlinear regression analysis(NRA)for studying the current waveform of the formation *** current waveform,displacement,and velocity of CT plasma in the acceleration region are calculated using this NRA-based one-dimensional point *** model results were in good agreement with the *** next-step upgrading reference scheme of the KTX-CTI device is preliminarily investigated using this NRA-based point *** research can provide insights for the development of experiments and future upgrades of the device.

关键词： compact torus(CT) circuit modelling nonlinear regression analysis(NRA) point model

Development of a compact torus injection system for the Keda Torus eXperiment

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Plasma Science and Technology 2022年第4期24卷 114-123页

作者： Chen CHEN Tao LAN Chijin XIAO Ge ZHUANG Defeng KONG shoubiao zhang Sen zhang Weixing DING Zhengwei WU Wenzhe MAO Jie WU Hangqi XU Jiaren WU Yiming ZU Dong zhang Zian WEI Xiaohui WEN Chu ZHOU Ahdi LIU Jinlin XIE Hong LI Wandong LIU Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People's Republic of China Department of Physics and Engineering Physics University of SaskatchewanSaskatoon SK S7N 5E2Canada Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

A compact torus injection system,KTX-CTI,has been developed for the planned injection experiments on the Keda Torus e Xperiment(KTX)reversed field pinch(RFP)device to investigate the physics and engineering issues associated with interaction between a compact torus(CT)and *** key interests include fueling directly into the reactor center,confinement improvement,and the injection of momentum and helicity into the RFP *** CT velocity and mass have been measured using a multichannel optical fiber interferometer,and for the first time the time evolution of the CT density profile during CT propagation is *** effects of discharge parameters on the number of injected particles,CT velocity and CT density have been characterized:the maximum hydrogen CT plasma mass,m,CTis 50μg,corresponding to 30%of the mass in a typical KTX plasma;the CT velocity exceeds 120 km *** is observed for the first time that multiple CTs can be produced and emitted during a very short period(<100μs)in one discharge,which is significant for the future study of repetitive CT injection,even with an ultra-high frequency.

关键词： compact torus injection central fueling reversed field pinch

Magnetohydrodynamic effect of internal transport barrier on EAST tokamak

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Plasma Science and Technology 2022年第3期24卷 71-79页

作者： Yuqi CHU Haiqing LIU shoubiao zhang Liqing XU Erzhong LI Yinxian JIE Hui LIAN Tianfu ZHOU Xi FENG Xuexi zhang Yunfei WANG Xiang ZHU Chenbin WU Shouxin WANG Yao YANG K HANADA Bo LYU Yingying LI Qing ZANG EAST Team Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China University of California Los AngelesCalifornia 90095United States of America Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityKasuga 816-8580Japan Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Research Institute for Applied Mechanics Kyushu UniversityKasugaFukuoka 816-8580Japan

An internal transport barrier(ITB)can be formed on EAST in exploring high-parameter *** studies show that safety factor(q)profiles,Shafranov shift and magnetohydrodynamic behaviors could be helpful in ITB formation by suppressing anomalous ***,electron density evolution with high resolution demonstrates that fishbone could be dominant in electron density ITB formation and *** power threshold is low in the fishbone condition and the electron density profile is determined by traits of *** shows that the low-k ion mode is suppressed by *** measurement of turbulence in the inner region shows that the internal kink mode could sustain an electron temperature ITB by suppressing the trapped electron *** multi-scale interaction between the kink mode and turbulence by current could be key in sustaining high-electron-temperature long-pulse operation.

关键词： ITB fishbone kink mode micro turbulence

Spontaneous current relaxation in NBI heated plasmas on EAST

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Plasma Science and Technology 2018年第9期20卷 3-7页

作者： Weixing DING Haiqing LIU Jinping QIAN shoubiao zhang D L BROWER Zhiyong ZOU Weiming LI Yao YANG Long ZENG Jinlin XlE Ping ZHU Changxuan YU Ting LAN Shouxin WANG Hui LIAN Yinxian JIE Liqun HU and Baonian WAN University of California Los Angeles Los AngelesCalifornia 90095United States of America Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People＇s Republic of China University of Science and Technology of China Hefei 230026People＇s Republic of China

We report on current profile evolution in EAST NBI driven plasmas where two neutral beams are injected,one during the current ramp phase and the second during *** the end of the current ramp phase,it is found that a flat q profile with q0-1 is achieved with low magnetic shear in the *** is observed that plasma current and density both relax much faster than resistive time,even in the absence of sawtooth activity when H-L transition *** fluctuations associated with magnetic perturbations（3/2） as a precursor to the H-L transition are *** is likely that these modes play a role in fast current transport.

关键词： current transport NBI plasma density fluctuations magnetic perturbations EAST