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Plasma Science and Technology 2012年第12期14卷 1041-1047页

作者： CHEN Zhipeng SUN Yue WANG Zhijiang yang zhoujun DING Yonghua ZHUANG Ge J-TEXT team State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Geospace Environment Chinese Academy of Sciences University of Science & Technology of China Hefei 230026 China

As the basic of a deeper investigation on the turbulent transport, the fluctuation property in the boundary of the newly-reconstructed Joint Texas Experimental Tokamak （J- TEXT） is studied experimentally using the reciprocating Langmuir four-tip probe, which has been built and operated as the primary diagnostic tool in the boundary of J-TEXT tokamak. In this paper, spatial profiles of the plasma-edge parameters are obtained, such as electron temperature, plasma density, plasma potential, poloidal electric field and their fluctuations. The results indicate the existence of a Er ×BT shear layer at the vicinity of last closed flux surface （LCFS）, with the fluctuations suppressed in varying degrees. The turbulence-induced particle and energy fluxes can be calculated by the local plasma parameters above. Convection dominates the cross-field turbulent transport in boundary plasma. Electrostatic fluctuations properties are also studied in detail with the help of numerical analysis. Statistical analysis on density fluctuation shows that, the intermittency can affect the turbulence in the scrape-off layer （SOL）.

关键词： electrostatic fluctuations anomalous transport J-TEXT reciprocating Lang- muir probe

Estimation of magnetic island width by the fluctuations of electron cyclotron emission radiometer on J-TEXT

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Plasma Science and Technology 2019年第1期21卷 24-28页

作者： Bowen RUAN zhoujun yang Xiaoming PAN Hao ZHOU Fengqi CHANG Jing ZHOU 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

The width of a magnetic island is an important parameter for the quantitative analysis of magnetohydrodynamic-related physics. An electron cyclotron emission radiometer(ECE) is a powerful tool that can be used to obtain this width, which can usually be determined from the flat temperature distribution at the O-point phase or the maxima temperature perturbation. An improved method to estimate the width of a magnetic island is proposed in this paper, and it is independent of calibration. With this method and the existing 24-channel ECE system, the width of a rotation magnetic island can be estimated. Additionally, by filtering the fluctuation ECE signal, the evolution of the magnetic island can be obtained. The results of this method are consistent with those of the integrated magnetic probe signals, which represent the relative change of the magnetic island.

关键词： magnetic island width ECE relative temperature perturbation J-TEXT tokamak

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

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Plasma Science and Technology 2022年第5期24卷 39-47页

作者： Qinghu yang Zhipeng CHEN Zhigang HAO yangming ZHAO Xin XU Shuhao LI Jie yang Wei YAN Zhonghe JIANG Zhongyong CHEN Nengchao WANG zhoujun yang Yuan PAN Yonghua DING the J-TEXT Team 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

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 *** probe consists of 8 graphite probe pins and a 3D magnetic probe,driven by a mechanical pneumatic *** 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 *** 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 *** establishment of CLMP provides data for the exploration of the coupling of electrostatic and magnetic fluctuations.

关键词： J-TEXT Langmuir probe magnetic probe eddy current effect electromagnetic mode

Development of the HCN heterodyne collective scattering system on J-TEXT

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Plasma Science and Technology 2022年第6期24卷 72-76页

作者： Qinlin TAO Peng SHI Li GAO Lu WANG Zhongyong CHEN Zhonghe JIANG Yinan ZHOU Chengyu yang Yuhan WANG Zhipeng CHEN Nengchao WANG zhoujun yang Yonghua DING Yuan PAN the J-TEXT Team 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 Technology Wuhan 430074People's Republic of China United Kingdom Atomic Energy Authority Culham Centre for Fusion EnergyCulham Science CentreAbingdonOxon OX143DBUnited Kingdom Southwestern Institute of Physics Chengdu 610041People's Republic of China

A heterodyne collective scattering system has been designed and developed to investigate the turbulent transport of core plasma on J-TEXT.A dual-HCN laser which consists of two separately pumped HCN gas lasers at 337μm has been developed as the laser source of the scattering *** intermediate frequency(IF)is~1 MHz when there is a 4μm cavity length difference and capable to maintain stability more than 5 h without manual *** channels at three different angles(2≤k_(⊥)≤12 cm^(-1))have been installed with Schottky barrier diode mixers of 893 *** sampling frequency of the acquisition system is6 MHz to observe low-frequency density *** experimental results have been detected and more results can be expected in future experiments.

关键词： collective scattering dual-HCN laser density fluctuations

Identification and Analysis of Magnetic Structures on HL-2A

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Southwestern Institute of Physics Annual Report

Southwestern Institute of Physics Annual Report 2006年第1期 53-54页

作者： JI Xiaoquan yang Qingwei FENG Beibing ZHOU Hangyu YUAN Baoshan CHEN Wei yang zhoujun

1 Introduction Tearing modes in tokamak plasmas have been studied for many years In HL-2A tokamak, MHD instabilities are investigated by means of the Mirnov probes. The mode number can be determined by the methods of phase comparison analysis or correlation analysis from the experimental data of Mirnov probes, but the analysis of complicated mode structures is difficult. An identification and analysis method of magnetic islands is presented basing on simulation of the perturbation current and magnetic field in plasmas.

关键词：磁性结构 HL-2A 原子核等离子体核反应

Development of the pellet injection system on the J-TEXT tokamak

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Plasma Science and Technology 2022年第9期24卷 127-133页

作者： Yingzhou JIANG Zhongyong CHEN You LI Wei YAN A LUKIN I VINYAR Feng LI Xin XU Zhipeng CHEN zhoujun yang Nengchao WANG Yonghua DING Yuan PAN the J-TEXT Team 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 PELIN LLC Saint-Petersburg 190031Russia

Pellet injection is an attractive technology for core-fueling and magnetohydrodynamic study in magnetic-conflnement fusion devices like tokamaks and *** can inject solid hydrogen/deuterium pellets into the plasma with deeper density deposition compared with other fueling methods,such as gas pufflng.A three-barrel H_(2)pellet injection system was installed on the J-TEXT tokamak and experiments were carried *** pellets are formed in three barrels cooled by a cryocooler and compressor system at around 9 K,and are 0.8 mm/1 mm diameter and 0.8 mm *** pellet is launched by helium propellant gas and injected from the lowfleld side of the *** normal range of pellet speed is 210–310 m s^(-1)for different propellant gas *** to the three-barrel structure,the number of injected pellets can be adjusted between one and *** can be launched sequentially with arbitrary time intervals,which enables flexible *** results of the experiments show that pellet fueling efflciency can reach 50%.The energy conflnement time increased by about 7.5–10 ms after pellet injection.

关键词： J-TEXT pellet injection system pellet fueling

Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak

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Plasma Science and Technology 2022年第12期24卷 127-137页

作者： Donghui XIA Xixuan CHEN Dengfeng XU Jiangang FANG Junli ZHANG Nengchao WANG zhoujun yang Zhongyong CHEN Yonghua DING Wei ZHENG Shaoxiang MA Zhijiang WANG Yuan PAN 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

In order to broaden the range of the plasma parameters and provide experimental conditions for physical research into high-performance plasma,the development of the electron cyclotron resonance heating(ECRH) system for the J-TEXT tokamak was initiated in *** the first stage,the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in *** than 400 kW electron cyclotron(EC) wave power has been injected into the plasma successfully,raising the core electron temperature to 1.5 *** 2022,another 105 GHz/500 kW/1 s gyrotron completed commissioning tests which signifies that the ECRH system could generate an EC wave power of 1 MW in *** the support of the ECRH system,various physical experiments have been carried out on *** electron thermal transport in ECRH plasmas has been *** ECRH is turned on,the electron thermal diffusivity significantly *** runaway current is elevated when a disruption occurs during ECRH *** the injected EC wave power is 400 kW,the conversion efficiency of runaway current increases from 35% to 75%.Fast electron behavior is observed in electron cyclotron current drive(ECCD) plasma by the fast electron bremsstrahlung diagnostic(FEB).The increase in the FEB intensity implies that ECCD could generate fast electrons.A successful startup with a 200 kW ECW is *** the upgrade of the ECRH system,the J-TEXT operational range could be expanded and further relevant research could be conducted.

关键词： ECRH J-TEXT tokamak electron thermal transport runaway electron current assisted start-up

Recent progress on the J-TEXT three-wave polarimeter-interferometer

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Plasma Science and Technology 2022年第6期24卷 1-6页

作者： Yuhan WANG Li GAO Peng SHI Xin XU Yinan ZHOU Qinglong yang Chengyu yang Qinlin TAO Chengshuo SHEN Yajun WANG Lu WANG Zhipeng CHEN Donghui XIA Zhongyong CHEN Nengchao WANG zhoujun yang Yonghua DING Yuan PAN J-TEXT Team 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 United Kingdom Atomic Energy Authority Culham Centre for Fusion EnergyCulham Science CentreAbingdonOxon OX143DBUnited Kingdom

The J-TEXT three-wave polarimeter-interferometer system(POLARIS),which measures timespace distribution of electron density and current density,has been optimized with both the optical system and the equilibrium reconstruction *** phase resolution of a Faraday rotation angle has been improved from 0.1 to 0.06 degree in chords from–0.18 to 0.18 m(plasma minor radius),and the sawtooth oscillation behavior has been detected by Faraday rotation angle *** combining the POLARIS measured data and the equilibrium and fitting code(EFIT),an upgraded equilibrium reconstruction method has been developed,which provides a more accurate temporal and spatial distribution of current density and electron *** means of the optimized POLARIS and improved equilibrium reconstruction,variations of profiles with increasing density have been carried out,under both Ohmic and electron cyclotron resonance heating discharges.

关键词： current density profile EFIT polarimeters

Behavior of multiple modes before and during minor disruption with the external resonant magnetic perturbations on J-TEXT tokamak

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Plasma Science and Technology 2022年第6期24卷 88-95页

作者： Mingxiang HUANG Zhengkang REN Feiyue MAO zhoujun yang Yuan GAO Zhichao ZHANG Shunfan HE Guoliang LI Jinrong FAN Wei TIAN Nengchao WANG Zhipeng CHEN Yonghua DING Yuan PAN Zhongyong CHEN College of Computer Science South-Central Minzu UniversityWuhan 430074People'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

The behavior of multiple modes before and during minor disruption with the external resonant magnetic perturbations(RMPs)has been studied on a J-TEXT *** main component of RMPs is m/n=2/1,where m and n are the numbers of the poloidal and toroidal modes,*** the mode-locking caused by RMPs,it is found that before a minor or a major disruption(if there is no minor disruption),strong oscillations in both electron temperature and density occur if the edge safety factor q_(a)>*** analysis shows that the oscillations are caused by the m/n=3/1 *** addition,using the ECE,Mirnov coils and 2D electron cyclotron emission imaging diagnostic systems,it is found that a thermal collapse occurs on the inner side of the 2/1magnetic island during the minor disruption,and before the collapse,a 3/2 island increases,after the collapse,the 3/2 island may ***,the study also shows that these 3/1,2/1 and 3/2modes play roles in the thermal collapse of disruptions.

关键词： oscillation multiple modes disruption

Overview of machine learning applications in fusion plasma experiments on J-TEXT tokamak

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Plasma Science and Technology 2022年第12期24卷 27-38页

作者： Wei ZHENG Fengming XUE Chengshuo SHEN Yu ZHONG Xinkun AI Zhongyong CHEN Yonghua DING Ming ZHANG zhoujun yang Nengchao WANG Zhichao ZHANG Jiaolong DONG Chouyao TANG Yuan PAN 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 Institute of Artificial Intelligence Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

Machine learning research and applications in fusion plasma experiments are one of the main subjects on *** 2013,various kinds of traditional machine learning,as well as deep learning methods have been applied to fusion plasma *** applications in the real-time experimental environment have proved the feasibility and effectiveness of the *** disruption prediction,we started by predicting disruptions of limited classes with a short warning time that could not meet the requirements of the mitigation *** years of study,nowadays disruption prediction methods on J-TEXT are able to predict all kinds of disruptions with a high success rate and long enough warning ***,cross-device disruption prediction methods have obtained promising *** analysis of the models are *** diagnostics data processing,efforts have been made to reduce manual work in processing and to increase the robustness of the diagnostic *** based on both traditional machine learning and deep learning have been applied to real-time experimental *** models have been cooperating with the plasma control system and other systems,to make joint decisions to further support the experiments.

关键词： machine learning disruption prediction diagnostics data processing J-TEXT