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Development of signal analysis method for the motional Stark effect diagnostic on EAST

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Plasma Science and Technology 2017年第10期19卷 1-4页

作者： Jia FU Bo LYU Haiqing LIU Yingying LI Dongmei LIU Yongqing WEI Chao FAN yuejiang shi Zhenwei WU Baonian WAN Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China HeFei University of Technology Hefei 230009 People＇s Republic of China Department of Nuclear Engineering Seoul National University Seoul 08826 Republic of Korea

A pilot single-channel Motional Stark Effect（MSE） diagnostic has been developed on EAST since 2015. The dual photo-elastic modulators（PEM） were employed to encode the polarization angle into a time-varying signal. The pitch angle was related to the ratio of modulation amplitude at the second harmonic frequency. A digital harmonic analyzer（DHA） technique was developed for extracting the second harmonic amplitude. The results were validated with a hardware phase lock-in amplifier, and is also consistent with the software dual phase-locking algorithm.

关键词： motional Stark effect fast Fourier transform

Modeling of ion cyclotron resonance frequency heating of proton-boron plasmas in EHL-2 spherical tokamak

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Plasma Science and Technology 2024年第10期26卷 39-48页

作者： Xianshu WU Jingchun LI Jiaqi DONG yuejiang shi Guoqing LIU Yong LIU Zhiqiang LONG Buqing ZHANG Baoshan YUAN Y.K.Martin PENG Minsheng LIU Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640People’s Republic of China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055People’s Republic of China ENN Science and Technology Development Co. Ltd.and Hebei Key Laboratory of Compact FusionLangfang 065001People’s Republic of China Siemens Shenzhen Magnetic Resonance Ltd. Shenzhen 518057People’s Republic of China

Ion cyclotron resonance heating(ICRH)stands out as a widely utilized and cost-effective auxiliary method for plasma heating,bearing significant importance in achieving high-performance discharges in p-^(11)B *** light of the specific context of p-^(11)B plasma in the EHL-2 device,we conducted a comprehensive scan of the fundamental physical parameters of the antenna using the full-wave simulation program *** preliminary result indicated that for p-^(11)B plasma,optimal ion heating parameters include a frequency of 40 MHz,with a high toroidal mode number like N_(?)=28 to heat the majority H *** addition,we discussed the impact of concentration of minority ion species on ion cyclotron resonance heating when^(11)B serves as the heavy minority *** significant difference in charge-to-mass ratio between boron and hydrogen ions results in a considerable distance between the hybrid resonance layer and the tow inverted cyclotron resonance layer,necessitating a quite low boron ion concentration to achieve effective minority *** also considered another method of direct heating of hydrogen ions in the presence of boron ion *** is found that at appropriate boron ion concentrations(X(^(11)B)~17%),the position of the hybrid resonance layer approaches that of the hydrogen ion cyclotron resonance layer,thereby altering the polarization at this position and significantly enhancing hydrogen ion fundamental absorption.

关键词： ICRF hydrogen-boron fusion mode conversion fundamental absorption

Radio-frequency measurements of energetic-electron-driven emissions using high-frequency magnetic probe on XuanLong-50 spherical torus

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Plasma Science and Technology 2023年第4期25卷 33-38页

作者：王明远伦秀春薄晓坤刘兵刘阿娣石跃江 Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’s Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China

A high-frequency magnetic probe is designed and developed on the XuanL ong-50(EXL-50)spherical torus to measure high-frequency magnetic field *** magnetic loop,radio filters,radio-frequency limiter,and data acquisition system of the probe are comprehensively *** fluctuation data from the EXL-50 plasma are analyzed in the time–frequency domain using fast Fourier ***,distinct high-frequency instabilities are detected using this diagnostic *** particular,significant frequency chirping is observed,which is consistent with the bumpon-tail drive instability predicted using the Berk–Breizman model.

关键词： high-frequency magnetic probe high-frequency instabilities XuanLong-50

Effect of resonant magnetic perturbation on boundary plasma turbulence and transport on J-TEXT tokamak

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Plasma Science and Technology 2019年第12期21卷 13-19页

作者： Ting WU Lin NIE Min XU Jie YANG Zhipeng CHEN yuejiang shi Nengchao WANG Da LI Rui KE Yi YU Shaobo GONG Ting LONG Yihang CHEN Bing LIU J-TEXT Team Southwestern Institute of Physics Chengdu 610041People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Nuclear Engineering Seoul National UniversitySeoul 08826Republic of Korea School of Physics University of Science and Technology of ChinaHefei 230026People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The effect of resonant magnetic perturbation(RMP) on boundary turbulence and transport in J-TEXT plasma is experimentally *** plasma fluctuations in discharges with and without the(m/n=3/1) RMP currents are diagnosed by using Langmuir probe *** was found that fluctuations in the edge and scrape-off layer(SOL) regions decrease with the application of a 6 kA *** broadband turbulence at the radial location of ρ~0.9 which has a characteristic frequency of 40-150 kHz was strongly suppressed when applying RMP,as was the radial turbulent particle flux and blob transport in the near-SOL *** experimental findings make RMP a promising method of suppressing and controlling turbulence and particle transport in a plasma boundary.

关键词： RMP turbulent transport blob

Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

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Plasma Science and Technology 2021年第10期23卷 112-119页

作者： Yaoyu Xie Kaijun Zhao Zhipeng Chen Jiaqi Dong Kimitaka Itoh Zhongyong Chen yuejiang shi Yonghua Ding Jun Cheng Longwen Yan Hai Liu Zhifeng Cheng Zhoujun Yang Nengchao Wang Lu Wang Jianqiang Xu Yunfeng Liang J-TEXT Team School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Science and Technology Research Chubu UniversityKasuga 816-8580Japan Research Center for Plasma Turbulence Kyushu UniversityKyushu UniversityChubu UniversityAichi 487-8501Japan National Institute for Fusion Science Toki 509-5292Japan ENN Science and Technology Development Co. Ltdand Hebei Key Laboratory of Compact FusionLangfang 065001People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first *** Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at the GAM frequency is observed in Mach number *** toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal *** ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and *** higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low *** coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated,and are higher than those between radial electric fields and Mach number fluctuations.

关键词： zonal flow geodesic acoustic mode tokamak return flow Mach number

低杂波电流驱动下HT-7超导托卡马克等离子体硬X射线辐射研究

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核技术 2000年第12期23卷 846-850页

作者：石跃江凌必利万宝年丁伯江中国科学院等离子体物理研究所合肥230031

用７个ＮａＩ（Ｔ１）闪烁探测器组成的阵列观测能量范围在２０—５００ｋｅＶ，来自ＨＴ—７托卡马克等离子体的硬Ｘ射线轫致辐射。实验结果显示，硬Ｘ射线的径向辐射强度分布与低杂波的功率谱和等离子体的密度及磁场强度等放电参数密... 详细信息

用７个ＮａＩ（Ｔ１）闪烁探测器组成的阵列观测能量范围在２０—５００ｋｅＶ，来自ＨＴ—７托卡马克等离子体的硬Ｘ射线轫致辐射。实验结果显示，硬Ｘ射线的径向辐射强度分布与低杂波的功率谱和等离子体的密度及磁场强度等放电参数密切相关。通过测量不同放电参数下硬Ｘ射线的径向强度分布，研究低杂波在等离子体中传播和吸收机制。

关键词：托卡马克 NaT(Tl)闪烁探测器硬X射线辐射

Observation and characterization of the effect of electron cyclotron waves on toroidal rotation in EAST L-mode discharges

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Plasma Science and Technology 2017年第10期19卷 14-19页

作者： Jun CHEN Ruiji HU Bo LYU Fudi WANG Xiaojie WANG Handong XU Yingying LI Jia FU Xianghui YIN Dajun WU Fukun LIU Qing ZANG Haiqing LIU yuejiang shi shifeng MAO Yi YU Baonian WAN Minyou YE Yongcai SHEN EAST team School of Nuclear Science and Technology University of Science and Technology of China Hefei 230026 People＇s Republic of China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China Department of Nuclear Engineering Seoul National University Seoul 151-742 Korea School of Physics and Electrical Engineering of Anqing Normal University Anqing 246011 People＇s Republic of China

The change in the toroidal rotation of plasma caused by electron cyclotron wave（ECW） injection has been observed in EAST. It is found that the response of the rotation is similar for all possible ECW toroidal injection angles. The core toroidal rotation velocity increases in the co-current direction along with a rise in the plasma temperature and stored energy. The profile of the electron temperature, ion temperature and toroidal rotation velocity gradually become *** change in toroidal rotation in the core increases with the ECW injection power. Different behavior is observed when the ECWs are injected into low hybrid current drive（LHCD） target plasmas, where the electron temperature and rotation profile become peaked, while the ion temperature profile flattens after ECW injection, suggesting different transport characteristics in energy and momentum.

关键词： ECW plasma toroidal rotation LHCD x-ray crystal spectrometer

J-TEXT achievements in turbulence and transport in support of future device/reactor

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Plasma Science and Technology 2024年第11期26卷 1-21页

作者： Zhipeng CHEN Zhangsheng HUANG Min JIANG Ting LONG Lu WANG Weixin GUO Zhoujun YANG Hai LIU Tao LAN Kaijun ZHAO Yuhong XU Rui KE Youwen SUN Hanhui LI Wen HE Ge ZHUANG yuejiang shi Wulyu ZHONG Yonghua DING Yunfeng LIANG Wenjing TIAN Xin XU Guodong ZHANG M.S.HUSSAIN Patrick H.DIAMOND State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’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 Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China College of Electrical Engineering&New Energy China Three Gorges UniversityYichang 443002People’s Republic of China Department of Engineering and Applied Physics School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026People’s Republic of China ENN Science and Technology Development Co.Ltd. and Hebei Key Laboratory of Compact FusionLangfang 065001People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Tsinghua University Beijing 100084People’s Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China Center for Astrophysics and Space Sciences University of California San DiegoLa Jolla CA 92093United States of America

Following the reconstruction of the TEXT tokamak at Huazhong University of Science and Technology in China, renamed as J-TEXT, a plethora of experimental and theoretical investigations has been conducted to elucidate the intricacies of turbulent transport within the tokamak configuration. These endeavors encompass not only the J-TEXT device's experimental advancements but also delve into critical issues pertinent to the optimization of future fusion devices and reactors. The research includes topics on the suppression of turbulence, flow drive and damping, density limit, non-local transport, intrinsic toroidal flow, turbulence and flow with magnetic islands, turbulent transport in the stochastic layer, and turbulence and zonal flow with energetic particles or helium ash. Several important achievements have been made in the last few years, which will be further elaborated upon in this comprehensive review.

关键词： J-TEXT tokamak turbulence transport flow

Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

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Plasma Science and Technology 2024年第8期26卷 32-36页

作者：董力立王明远刘文军石跃江董家齐郭栋孙恬恬顾翔宋显明袁保山彭元凯 the ENN Team Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China School of Mathematics and Physics Anqing Normal UniversityAnqing 246133People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China

A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50(EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field(B_(V)),plasma current(I_(p)), the poloidal ratio(β_(p)) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.

关键词： plasma equilibrium Shafranov formula multi-fluid plasma