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Overview of runaway current suppression and dissipation on j-text tokamak

Plasma Science and Technology 2022年第12期24卷 115-125页

作者： Zhongyong CHEN Zhifang LIN Wei YAN Duwei HUANG Yunong WEI You LI Nianheng CAI jie HU Yonghua DING Yunfeng LIANG Zhonghe jIANG 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 School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People's Republic of China

The main works on disruption mitigation including suppression and mitigation of runaway current on the j-text tokamak are summarized in this *** strategies for the mitigation of runaway electron(RE) beams are applied in *** first strategy enables the REs to be completely suppressed by means of supersonic molecular beam injection and resonant magnetic perturbation which can enhance RE loss,magnetic energy transfer which can reduce the electric field,and secondary massive gas injection(MGI) which can increase the collisional *** the second strategy,the runaway current is allowed to form but should be dissipated or soft landed within *** is observed that the runaway current can be significantly dissipated by MGI,and the dissipation rate increases with the injected impurity particle number and eventually stabilizes at 28 MA s^(-1).The dissipation rate of the runaway current can be up to 3 MA s^(-1)by ohmic *** pellet injection has been chosen as the main disruption mitigation method,which has the capability of injecting material deeper into the plasma for higher density assimilation when compared to ***,simulation works show that the RE seeds in the plasma are strongly influenced under different phases and sizes of 2/1 mode locked islands during thermal *** robust runaway suppression and runaway current dissipation provide an important insight on the disruption mitigation for future large tokamaks.

关键词： tokamak disruption mitigation runaway electron runaway current

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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

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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

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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

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Effect of edge magnetic island on carbon screening in the j-text tokamak

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Plasma Science and Technology 2021年第12期23卷 22-31页

作者： Xiaolong ZHANG Zhifeng CHENG Song ZHOU Yunfeng LIANG Wei YAN Nengchao WANG Xiaoyi ZHANG Zhonghe jIANG Zhoujun YANG Xin XU Da LI Qiong LI Xiaodong LIN Yonghua DING Zhongyong CHEN Zhipeng CHEN j-text team 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 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Forschungszentrum jiilich GmbH Institut fur Energie und Klimaforschung-Plasmaphysik52425 JiilichGermany

The effect of externally applied resonant magnetic perturbation(RMP)on carbon impurity behavior is investigated in the j-text *** is found that the m/n=3/1 islands have an impurity screening effect,which becomes obvious while the edge magnetic island is generated via RMP field *** impurity screening effect shows a dependence on the RMP phase with the field penetration,which is strongest if the O point of the magnetic island is near the low-field-side(LFS)limiter *** combining a methane injection experimental study and STRAHL impurity transport analysis,we found that the variation of the impurity transport dominates the impurity screening *** impurity diffusion at the inner plasma region(r/a<0.8)is enhanced with a significant increase in outward convection velocity at the edge region in the case of the magnetic island’s O point near the LFS limiter *** impurity transport coefficient varies by a much lower level for the case with the magnetic island’s X point near the LFS limiter *** interaction of the magnetic island and the LFS limiter plate is thought to contribute to the impurity transport variation with the dependence on the RMP phase.A possible reason is the interaction between the magnetic island and the LFS limiter.

关键词： magnetic island impurity transport resonant magnetic perturbation boundary plasma physics j-text tokamak

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Observation of the poloidally asymmetrical density perturbation of sawtooth collapse on j-text

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Plasma Science and Technology 2023年第3期25卷 32-39页

作者：周乙楠庄革石鹏高丽杨州军张晓卿 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 Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026People’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

The detailed density perturbations provided by the advanced polarimeter-interferometer system(Polaris) during sawtooth collapse on the joint Texas Experimental Tokamak(j-text) are reported in this *** a sawtooth collapse and the crash of plasma pressure at the center,it is found that the increase in density in the region between the inversion radius and mixing radius is poloidally asymmetrical,while the increase in temperature is poloidally *** poloidal location where the density increases is dependent on the phase of the precursory m/n=1/1 kink *** is always out of phase with the hot core of the m/n=1/1 *** behaviors of density perturbations during sawtooth collapse observed in j-text are beyond the expectations of the standard model,and this can shed new light on the understanding of sawtooth collapse.

关键词： tokamak sawtooth collapse polarimeter density perturbation

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Suppression of runaway current by electrode biasing and limiter biasing on j-text

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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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Soft landing of runaway currents by ohmic field in j-text tokamak

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Plasma Science and Technology 2020年第11期22卷 11-22页

作者： jie HU Wei YAN Ruihai TONG Wei LI Zhongyong CHEN Anjue DAI Duwei HUANG Yunong WEI Tiankui MA Yuan HUANG Yang LI Wei ZHENG Zhifang LIN You LI Huaiyu YANG Duoqin WANG Wei BAI Yu ZHONG jiangang FANG 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 Tech no logyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041.People's Republic of China Chengdu University Chengdu 610106People's Republic of China Beibu Gulf University Qinzhou 535000People's Republic of China

Recently,experimental studies on the soft landing of RE current by ohmic(OH)field have been performed in j-text tokamak,as a possible auxiliary method to dissipate the RE *** optimized horizontal displacement control of the RE beam,the toroidal electric field has been scanned from 1.6 to—0.3 V m^-1 during the RE plateau *** growth rate of RE currents and the evolution of hard x-ray(HXR)emissions have been *** is found that when the toroidal electric field is less than 7-12 times the theoretical critical electric field,the decay of REs could be *** dissipation rate by the ohmic field can reach a maximum value of 3 MA s^-***,the results of HXR spectra analysis indicate the different behaviors of HXR emissions under the condition of different toroidal electric *** analysis of the ionized argon emissions and magnetic fluctuations shows that under the condition of different toroidal electric fields,the physical process of RE generation may be different.

关键词： tokamak disruption runaway electron hard x-ray

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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

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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

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