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Design of new resonant magnetic perturbation coils on the J-TEXT tokamak
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作者 黄卓 周松 +11 位作者 樊金荣 李达 饶波 王能超 丁永华 毛飞越 黄名响 田微 陈忠勇 陈志鹏 梁云峰 the J-TEXT Team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第11期142-149,共8页
The resonant magnetic perturbation(RMP)system is a powerful auxiliary system on tokamaks.On the J-TEXT tokamak,a set of new in-vessel coils is designed to enhance the amplitude of the RMP.The new coils are designed to... The resonant magnetic perturbation(RMP)system is a powerful auxiliary system on tokamaks.On the J-TEXT tokamak,a set of new in-vessel coils is designed to enhance the amplitude of the RMP.The new coils are designed to be two-turn saddle coils.These two-turn saddle coils have been optimized in terms of their structure,support,and protection components to overcome the limitations of the narrow in-vessel space,resulting in a compact coil module that can be accommodated in the vessel.To verify the feasibility of this design,an electromagnetic simulation is performed to investigate the electrical parameters and the generated field of the coils.A multi-field coupled simulation is performed to investigate the capacity of heat dissipation.As a result of these efforts,the new RMP coils have been successfully installed on the J-TEXT tokamak.It has significantly enhanced the RMP amplitude and been widely applied in experiments. 展开更多
关键词 fusion engineering TOKAMAK resonant magnetic perturbation coil multi-field coupled simulation(Some fioures may appeari in colour only in the online iournal)
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Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak 被引量:1
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作者 Donghui XIA Xixuan CHEN +10 位作者 Dengfeng XU Jiangang FANG Junli ZHANG Nengchao WANG Zhoujun YANG Zhongyong CHEN Yonghua DING Wei ZHENG Shaoxiang MA Zhijiang WANG Yuan PAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第12期127-137,共11页
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 fo... 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 2017.For the first stage,the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in 2019.More than 400 kW electron cyclotron(EC) wave power has been injected into the plasma successfully,raising the core electron temperature to 1.5 keV.In 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 total.Under the support of the ECRH system,various physical experiments have been carried out on J-TEXT.The electron thermal transport in ECRH plasmas has been investigated.When ECRH is turned on,the electron thermal diffusivity significantly increases.The runaway current is elevated when a disruption occurs during ECRH heating.When 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 achieved.With the upgrade of the ECRH system,the J-TEXT operational range could be expanded and further relevant research could be conducted. 展开更多
关键词 ECRH J-TEXT tokamak electron thermal transport runaway electron current assisted start-up
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Startup of Plasma Current in J-TEXT Tokamak Prompted by the H_α Line Emission Criterion
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作者 高丽 庄革 +1 位作者 胡希伟 张明 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第2期137-141,共5页
An Hα line-emission detection system was developed on the joint texas experimental tokamak (J-TEXT), which is used to determine the Hα emission level during the gas breakdown and hereafter to control the startup o... An Hα line-emission detection system was developed on the joint texas experimental tokamak (J-TEXT), which is used to determine the Hα emission level during the gas breakdown and hereafter to control the startup of the plasma current. The detector consists of an Hα interference filter, a focusing lens, a photodiode and a preamplifier. In the J-TEXT operation, the Hα emission is taken as a monitor signal which is highly sensitive to the generation of a plasma. Furthermore, the power supply control system using the above signal as an input is capable of determining whether and when to fire the Ohmic heating capacitor banks, which are applied to drive the plasma current ramp-up. The experimental results confirm that the Hα emission criterion is acceptable for controlling the plasma current promotion in the J-TEXT tokamak. 展开更多
关键词 J-TEXT tokamak emission CRITERION STARTUP plasma current
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Effect of edge magnetic island on carbon screening in the J-TEXT tokamak
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作者 Xiaolong ZHANG Zhifeng CHENG +14 位作者 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 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第12期22-31,共10页
The effect of externally applied resonant magnetic perturbation(RMP)on carbon impurity behavior is investigated in the J-TEXT tokamak.It is found that the m/n=3/1 islands have an impurity screening effect,which become... The effect of externally applied resonant magnetic perturbation(RMP)on carbon impurity behavior is investigated in the J-TEXT tokamak.It 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 penetration.The 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 plate.By combining a methane injection experimental study and STRAHL impurity transport analysis,we found that the variation of the impurity transport dominates the impurity screening effect.The 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 plate.The impurity transport coefficient varies by a much lower level for the case with the magnetic island’s X point near the LFS limiter plate.The 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. 展开更多
关键词 magnetic island impurity transport resonant magnetic perturbation boundary plasma physics J-TEXT tokamak
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A brief review of the development and optimization of the three-dimensional magnetic configuration system in the J-TEXT tokamak
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作者 Zhonghe JIANG Yonghua DING +3 位作者 Bo RAO Nengchao WANG Yangbo LI Jie HUANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第12期166-171,共6页
The three-dimensional(3D) magnetic configuration system in the J-TEXT tokamak has featured in many experimental studies.The system mainly consists of three subsystems:the static resonant magnetic perturbation(SRMP) sy... The three-dimensional(3D) magnetic configuration system in the J-TEXT tokamak has featured in many experimental studies.The system mainly consists of three subsystems:the static resonant magnetic perturbation(SRMP) system,the dynamic resonant magnetic perturbation(DRMP) system and the helical coil system.The SRMP coil system consist of two kinds of coils,i.e.three six-loop coils and two five-loop coils.It can suppress tearing modes with a moderate strength,and may also cause mode locking with larger amplitude.The DRMP coil system consists of 12 single-turn saddle coils(DRMP1) and 12 double-turn saddle coils(DRMP2).Its magnetic field can be rotated at a few kHz,leading to either acceleration or deceleration of the tearing mode velocity and the plasma rotation.The helical coil system consists of two closed coils,and is currently under construction to provide external rotational transform in J-TEXT.The 3D magnetic configuration system can suppress tearing modes,preventing and avoiding the occurrence of major disruption. 展开更多
关键词 tearing mode resonant magnetic perturbation external rotational transform plasma stability J-TEXT tokamak
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Machine learning application to predict the electron temperature on the J-TEXT tokamak
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作者 Jiaolong DONG Jianchao LI +8 位作者 Yonghua DING Xiaoqing ZHANG Nengchao WANG Da LI Wei YAN Chengshuo SHEN Ying HE Xiehang REN Donghui XIA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第8期47-52,共6页
The reliability of diagnostic systems in tokamak plasma is of great significance for physics researches or fusion reactor.When some diagnostics fail to detect information about the plasma status,such as electron tempe... The reliability of diagnostic systems in tokamak plasma is of great significance for physics researches or fusion reactor.When some diagnostics fail to detect information about the plasma status,such as electron temperature,they can also be obtained by another method:fitted by other diagnostic signals through machine learning.The paper herein is based on a machine learning method to predict electron temperature,in case the diagnostic systems fail to detect plasma temperature.The fully-connected neural network,utilizing back propagation with two hidden layers,is utilized to estimate plasma electron temperature approximately on the J-TEXT.The input parameters consist of soft x-ray emission intensity,electron density,plasma current,loop voltage,and toroidal magnetic field,while the targets are signals of electron temperature from electron cyclotron emission and x-ray imaging crystal spectrometer.Therefore,the temperature profile is reconstructed by other diagnostic signals,and the average errors are within 5%.In addition,generalized regression neural network can also achieve this function to estimate the temperature profile with similar accuracy.Predicting electron temperature by neural network reveals that machine learning can be used as backup means for plasma information so as to enhance the reliability of diagnostics. 展开更多
关键词 neural network PLASMA electron temperature J-TEXT tokamak
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Stress and Thermal Analysis of the In-Vessel Resonant Magnetic Perturbation Coils on the J-TEXT Tokamak
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作者 HAO Changduan ZHANG Ming +3 位作者 DING Yonghua RAO Bo CEN Yishun ZHUANG Ge 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第1期83-88,共6页
A set of four in-vessel saddle coils was designed to generate a helical field on the J- TEXT tokamak to study the influences of the external perturbation field on plasma. The coils are fed with alternating current up ... A set of four in-vessel saddle coils was designed to generate a helical field on the J- TEXT tokamak to study the influences of the external perturbation field on plasma. The coils are fed with alternating current up to 10 kA at frequency up to 10 kHz. Due to the special structure, complex thermal environment and limited space in the vacuum chamber, Jt is very important to make sure that the coils will not be damaged when undergoing the huge electromagnetic forces in the strong toroidal field, and that their temperatures don't rise too much and destroy the in- sulation. A 3D finite element model is developed in this paper using the ANSYS code, stresses are analyzed to find the worst condition, and a mounting method is then established. The results of the stress and modal analyses show that the mounting method meets the strength requirements. Finally, a thermal analysis is performed to study the cooling process and the temperature distribution of the coils. 展开更多
关键词 J-TEXT tokamak resonant magnetic perturbation (RMP) coils finite ele- ment analysis (FEA)
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Plasma equilibrium calculation in J-TEXT tokamak 被引量:1
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作者 Hailong GAO Tao XU +1 位作者 Zhongyong CHEN Ge ZHUANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第11期1-5,共5页
Plasma equilibrium has been calculated using an analytical method. The plasma profiles of the current density, safety factor, pressure and magnetic surface function are obtained. The analytical solution of the Grad–S... Plasma equilibrium has been calculated using an analytical method. The plasma profiles of the current density, safety factor, pressure and magnetic surface function are obtained. The analytical solution of the Grad–Shafranov(GS) equation is obtained by the variable separation method and compared with the computed results of the equilibrium fitting code EFIT. 展开更多
关键词 plasma equilibrium EFIT analytical solution TOKAMAK
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Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of J-TEXT Tokamak Using Reciprocating Probe 被引量:3
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作者 CHEN Zhipeng SUN Yue +4 位作者 WANG Zhijiang YANG Zhoujun DING Yonghua ZHUANG Ge J-TEXT team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第12期1041-1047,共7页
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 r... 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). 展开更多
关键词 electrostatic fluctuations anomalous transport J-TEXT reciprocating Lang- muir probe
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Plasma Electron Density Measuring and Processing on the J-TEXT Tokamak 被引量:2
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作者 舒双宝 罗家融 +1 位作者 薛二兵 盛静 《Journal of Donghua University(English Edition)》 EI CAS 2011年第6期576-579,共4页
Plasma electron density is one of the most fundamental parameters in the study of tokamak plasma physics.The method of plasma electron density measuring and processing on the Joint Texas Experimental Tokamak(J-TEXT) w... Plasma electron density is one of the most fundamental parameters in the study of tokamak plasma physics.The method of plasma electron density measuring and processing on the Joint Texas Experimental Tokamak(J-TEXT) was presented in this paper.The principle of the plasma electron density measuring by hydrogen cyanide(HCN) laser interferometer was introduced.Room temperature triglycine sulface(TGS) detector was used to obtain the beat signal of HCN,and phase difference was measured by high-speed acquisition card DAQ2010.Based on the signal characteristics,a specific HCN processing algorithm was designed to eliminate the baseline offset accurately and process overturns of HCN signals effectively.As a result,plasma electron density with high accuracy and low noise has been obtained during the J-TEXT tokamak experiment. 展开更多
关键词 TOKAMAK plasma electron density hydrogen cyanide(HCN) laser triglycine sulface(TGS) detector phase difference measuring
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Overview of runaway current suppression and dissipation on J-TEXT tokamak 被引量:1
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作者 Zhongyong CHEN Zhifang LIN +9 位作者 Wei YAN Duwei HUANG Yunong WEI You LI Nianheng CAI Jie HU Yonghua DING Yunfeng LIANG Zhonghe JIANG J-TEXT Team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第12期115-125,共11页
The main works on disruption mitigation including suppression and mitigation of runaway current on the J-TEXT tokamak are summarized in this paper.Two strategies for the mitigation of runaway electron(RE) beams are ap... The main works on disruption mitigation including suppression and mitigation of runaway current on the J-TEXT tokamak are summarized in this paper.Two strategies for the mitigation of runaway electron(RE) beams are applied in experiments.The 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 damping.For the second strategy,the runaway current is allowed to form but should be dissipated or soft landed within tolerance.It 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 field.Shattered 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 MGI.Moreover,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 quench.The robust runaway suppression and runaway current dissipation provide an important insight on the disruption mitigation for future large tokamaks. 展开更多
关键词 TOKAMAK disruption mitigation runaway electron runaway current
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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak 被引量:1
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作者 Yaoyu Xie Kaijun Zhao +15 位作者 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 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第10期112-119,共8页
The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first demonstrated.Multiple Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at... The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first demonstrated.Multiple 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 fluctuations.The toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal velocity.The ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and 1.0.With higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low q.The 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. 展开更多
关键词 zonal flow geodesic acoustic mode TOKAMAK return flow Mach number
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The anode power supply for the ECRH system on the J-TEXT tokamak
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作者 夏冬辉 崔芳泰 +4 位作者 刘昌海 余振雄 金易坤 王之江 J-TEXT team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第1期120-126,共7页
The electron cyclotron resonance heating (ECRH) system with a 60 GHz/200 kW/0.5 s gyrotron donated by the Culham Science Center is being developed on the J-TEXT tokamak for plasma heating, current drive and MHD stud... The electron cyclotron resonance heating (ECRH) system with a 60 GHz/200 kW/0.5 s gyrotron donated by the Culham Science Center is being developed on the J-TEXT tokamak for plasma heating, current drive and MHD studies. Simultaneously, an anode power supply (APS) has been rebuilt and tested for the output power control of the gyrotron, of which the input voltage is derived from an 80 kV negative cathode power supply. The control strategy by controlling the grid voltage of the tetrode TH5186 is applied to obtain an accurate anode climbing voltage, of which the output voltage can be obtained from 0-30 kV with respect to the cathode power supply. The characteristics of the APS, including control, protection, modulation, and output waveform, were tested with a 100 kV/60 A negative cathode power supply, a dummy load and the ECRH control system. results indicate that the APS can meet the requirements of the ECRH system on J-TEXT. 展开更多
关键词 J-TEXT ECRH APS Fiber isolation
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Design of the Control System of Toroidal Field (TF) Power Supply for J-TEXT Tokamak
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作者 张明 庄革 +2 位作者 于克训 邱胜顺 潘垣 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第6期754-757,共4页
J-TEXT, formerly TEXT-U at the University of Texas at Austin in USA, is a medium-sized tokamak at the Huazhong University of Science and Technology. The toroidal field (TF) power supply of this tokamak should provid... J-TEXT, formerly TEXT-U at the University of Texas at Austin in USA, is a medium-sized tokamak at the Huazhong University of Science and Technology. The toroidal field (TF) power supply of this tokamak should provide a current of 160 kA and a flat duration of 500 ms for the toroidal field coils to generate a maximum toroidal field of 3 T at the geometric center of the vaccum vessel. This paper presents a design of a new control system which takes the real-time feedback control option for the TF power supply operation. The system was tested successfully during the commissioning. In the first experimental campaign of J-TEXT, the system effectively controlled the power supply to provide a fiat current up to 92.5 kA and therein the TF produced reached 1.74 T, which enabled the machine to generate the first plasma successfully. 展开更多
关键词 J-TEXT TF power supply CONTROL DESIGN
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The application of limiter target electrostatic measurement system in J-TEXT tokamak
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作者 Jie YANG Zhipeng CHEN +6 位作者 Hai LIU Tong WANG Mingcong ZHU Zebao SONG Zhijiang WANG Ge ZHUANG Yonghua DING 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第10期40-46,共7页
The limiter target electrostatic measurement system including limiter grounding current sensors and Langmuir probes have been newly developed for the measurement of the limiter target area on the Joint-Texas Experimen... The limiter target electrostatic measurement system including limiter grounding current sensors and Langmuir probes have been newly developed for the measurement of the limiter target area on the Joint-Texas Experimental tokamak (J-TEXT). Current sensors fixed between graphite limiters and the vacuum vessel walls are used to measure the currents between limiters and vessel wall. Simultaneously, a rectangular poloidal array containing 54 Langmuir probes is embedded in the graphite tiles of limiters for a more localized measurement. Based on this system, the effect of both the plasma’s inherent behavior, including plasma motion and the 2/1 tearing mode, and the electrode biasing on probe and sensor signals have been observed and analyzed in the experiments. 展开更多
关键词 LIMITER TARGET ELECTROSTATIC FLUCTUATIONS LANGMUIR probe edge current J-TEXT
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Overview of machine learning applications in fusion plasma experiments on J-TEXT tokamak
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作者 Wei ZHENG Fengming XUE +11 位作者 Chengshuo SHEN Yu ZHONG Xinkun AI Zhongyong CHEN Yonghua DING Ming ZHANG Zhoujun YANG Nengchao WANG Zhichao ZHANG Jiaolong DONG Chouyao TANG Yuan PAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第12期27-38,共12页
Machine learning research and applications in fusion plasma experiments are one of the main subjects on J-TEXT.Since 2013,various kinds of traditional machine learning,as well as deep learning methods have been applie... Machine learning research and applications in fusion plasma experiments are one of the main subjects on J-TEXT.Since 2013,various kinds of traditional machine learning,as well as deep learning methods have been applied to fusion plasma experiments.Further applications in the real-time experimental environment have proved the feasibility and effectiveness of the methods.For disruption prediction,we started by predicting disruptions of limited classes with a short warning time that could not meet the requirements of the mitigation system.After 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 time.Furthermore,cross-device disruption prediction methods have obtained promising results.Interpretable analysis of the models are studied.For diagnostics data processing,efforts have been made to reduce manual work in processing and to increase the robustness of the diagnostic system.Models based on both traditional machine learning and deep learning have been applied to real-time experimental environments.The models have been cooperating with the plasma control system and other systems,to make joint decisions to further support the experiments. 展开更多
关键词 machine learning disruption prediction diagnostics data processing J-TEXT
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Development of the pellet injection system on the J-TEXT tokamak
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作者 Yingzhou JIANG Zhongyong CHEN +11 位作者 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 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第9期127-133,共7页
Pellet injection is an attractive technology for core-fueling and magnetohydrodynamic study in magnetic-conflnement fusion devices like tokamaks and stellarators.It can inject solid hydrogen/deuterium pellets into the... Pellet injection is an attractive technology for core-fueling and magnetohydrodynamic study in magnetic-conflnement fusion devices like tokamaks and stellarators.It 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 out.The 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 length.The pellet is launched by helium propellant gas and injected from the lowfleld side of the plasma.The normal range of pellet speed is 210–310 m s^(-1)for different propellant gas pressures.Due to the three-barrel structure,the number of injected pellets can be adjusted between one and three.Pellets can be launched sequentially with arbitrary time intervals,which enables flexible applications.The 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. 展开更多
关键词 J-TEXT pellet injection system pellet fueling
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Implementation of Automatic Process of Edge Rotation Diagnostic System on J-TEXT Tokamak
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作者 张泽品 程芝峰 +4 位作者 罗剑 王之江 张晓龙 侯赛英 成诚 《Plasma Science and Technology》 SCIE EI CAS CSCD 2014年第8期789-793,共5页
A spectral diagnostic control system (SDCS) is developed to implement automatic process of the edge rotation diagnostic system on the J-TEXT tokamak. The SDCS contains a control module, data operation module, data a... A spectral diagnostic control system (SDCS) is developed to implement automatic process of the edge rotation diagnostic system on the J-TEXT tokamak. The SDCS contains a control module, data operation module, data analysis module, and data upload module. The core of this system is a newly developed software "Spectra Assist", which completes the whole process by coupling all related subroutines and servers. The results of data correction and calculated rotation are presented. In the daily discharge of J-TEXT, SDCS is proved to have a stable performance and high efficiency in completing the process of data acquisition, operation and results output. 展开更多
关键词 edge rotation diagnostic control system J-TEXT mixed programming
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The Construction of Plasma Density Feedback Control System on J-TEXT Tokamak
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作者 柯新 陈志鹏 +4 位作者 巴为刚 舒双宝 高丽 张明 庄革 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第2期211-216,共6页
The plasma density feedback control system(PDFCS) has been established on the Joint Texas Experimental Tokamak(J-TEXT) for meeting the need for an accurate plasma density in physical experiments.It consists of a d... The plasma density feedback control system(PDFCS) has been established on the Joint Texas Experimental Tokamak(J-TEXT) for meeting the need for an accurate plasma density in physical experiments.It consists of a density measurement subsystem,a feedback control subsystem and a gas puffing subsystem.According to the characteristic of the gas puffing system,a voltage amplitude control mode has been applied in the feedback control strategy,which is accomplished by the proportion,integral and differential(PID) controller.In this system,the quantity calibration of gas injection,adjusted responding to the change of the density signal,has been carried out.Some experimental results are shown and discussed. 展开更多
关键词 density feedback control tokamak PID
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Design and first result of combined Langmuir-magnetic probe on J-TEXT tokamak
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作者 Qinghu YANG Zhipeng CHEN +12 位作者 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 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第5期39-47,共9页
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 tokamak.The probe consists of 8 graph... 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 tokamak.The probe consists of 8 graphite probe pins and a 3D magnetic probe,driven by a mechanical pneumatic device.By 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 sleeve.In 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 surface.The establishment of CLMP provides data for the exploration of the coupling of electrostatic and magnetic fluctuations. 展开更多
关键词 J-TEXT Langmuir probe magnetic probe eddy current effect electromagnetic mode
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