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Suppression of runaway current by electrode biasing and limiter biasing on J-TEXT

Plasma Science and Technology 2022年第12期24卷 7-14页

作者： lingke mou Zhongyong CHEN Wei YAN You LI Weikang ZHANG Jiangang FANG Yingzhou JIANG Xiaobo ZHANG Yu ZHONG Feng LI Guinan ZOU Fanxi LIU Zhipeng CHEN Zhoujun YANG Nengchao WANG 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

The avoidance of runaway electrons(REs) generated during plasma disruption is of great concern for the safe operation of tokamak *** study on the suppression of runaway current by electrode biasing(EB) and limiter biasing(LB) has been performed on the J-TEXT tokamak,which could be an alternative way to suppress the runaway *** experimental results show that the higher the voltage value,the smaller the runaway current in both EB and LB *** runaway current can be completely suppressed at an electrode biased voltage of +450 V and a limiter biased voltage of +300 *** comparison of the energy spectra during the runaway plateau phase shows that the maximum energy max(E_(RE)) and radiation temperature T_(HXR)hard x-rays(HXRs)are significantly reduced after the application of +200 V limiter biased *** electric field generated by the biased voltage may be the key factor to suppress the runaway current,and the measured radial electric field increases obviously after the voltage is *** may result in an increase in the loss of REs to realize the suppression of runaway current.

关键词： plasma disruption electrode biasing limiter biasing runaway current

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Study of the fast electron behavior in electron cyclotron current driven plasma on J-TEXT

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Plasma Science and Technology 2022年第6期24卷 45-52页

作者： Xiaobo ZHANG Wei YAN Zhongyong CHEN Jiangang FANG Junli ZHANG You LI Xixuan CHEN Yunong WEI Ruihai TONG Zhifang LIN Yu ZHONG lingke mou Feng LI Weikang ZHANG Lu WANG Donghui XIA Zhonghe JIANG Zhoujun YANG Nengchao WANG Zhipeng CHEN Yonghua DING Yunfeng LIANG Yan 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 Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikD-52425 JülichGermany

In J-TEXT tokamak,fast electron bremsstrahlung diagnostic with 9 chords equipped with multichannel analyzer enables detailed studies of the generation and transport of fast *** spatial profiles and energy spectrum of the fast electrons have been measured in two ECCD cases with either on-axis or off-axis injection,and the profiles processed by Abel-inversion are consistent with the calculated power deposition ***,it is observed that the energy of fast electrons increases rapidly after turning off the ECCD,which may be attributed to the acceleration by the recovered loop voltage at low electron density.

关键词： fast electron tokamak electron cyclotron current drive power deposition location

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维普期刊数据库

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Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak

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Plasma Science and Technology 2022年第12期24卷 183-189页

作者： Jiangang FANG Wei YAN Zhongyong CHEN Xiaobo ZHANG Xixuan CHEN Junli ZHANG Feiyue MAO You LI lingke mou Yu ZHONG Feng Li Weikang ZHANG Fanxi LIU Guinan ZOU Song ZHOU Da LI Li GAO Donghui XIA Zhoujun YANG Zhipeng CHEN Nengchao WANG Yonghua DING Yunfeng LIANG 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 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikD-52425 JülichGermany

Electron cyclotron current drive(ECCD) efficiency research is of great importance for the neoclassical tearing mode(NTM) *** ECCD efficiency is beneficial for the NTM stabilization and the ECCD power threshold *** efficiency has been investigated on the J-TEXT *** electron cyclotron wave(ECW) power scan was performed to obtain the current drive *** current drive efficiency is derived to be approximately η_(0)=(0.06-0.16)×10^(19)A m^(-2)W^(-1)on the J-TEXT *** effect of the residual toroidal electric field has been included in the determination of the current drive efficiency,which will enhance the ECCD *** the plasma current of I_(p)=100 kA and electron density of n_(e)=1.5×10^(19)m^(-3),the ratio of Spitzer conductivity between omhic(OH)and ECCD phases is considered and the experimental data have been *** correction results show that the current drive efficiency η_(1)caused by the fast electron hot conductivity decreases by approximately 79%.It can be estimated that the driven current is approximately 24 kA at 300 kW ECW power.

关键词： electron cyclotron current drive current drive efficiency residual toroidal electric field

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