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Development of a toroidal soft x-ray imaging system and application for investigating three-dimensional plasma on j-text

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Plasma Science and Technology 2024年第3期26卷 94-99页

作者：赵传旭李建超张晓卿王能超丁永华杨州军江中和严伟李杨波毛飞越任正康 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 Engineering and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205People'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

A toroidal soft x-ray imaging(T-SXRI)system has been developed to investigate threedimensional(3D)plasma physics on *** T-SXRI system consists of three sets of SXR *** sets are newly developed and located on the vacuum chamber wall at toroidal positionsφof 126.4°and 272.6°,respectively,while one set was established previously atφ=*** set of SXR arrays consists of three arrays viewing the plasma poloidally,and hence can be used separately to obtain SXR images via the tomographic *** sawtooth precursor oscillations are measured by T-SXRI,and the corresponding images of perturbative SXR signals are successfully reconstructed at these three toroidal positions,hence providing measurement of the 3D structure of precursor *** observed 3D structure is consistent with the helical structure of the m/n=1/1 *** experimental observation confirms that the T-SXRI system is able to observe 3D structures in the j-text plasma.

关键词： SXR imaging j-text tokamak three-dimensional measurement MHD

Suppression of the m/n=2/1 tearing mode by electron cyclotron resonance heating on j-text

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Plasma Science and Technology 2024年第8期26卷 8-17页

作者：方建港陈忠勇严伟王能超毛飞越罗蔷玄子健陈曦璇任正康张峰黄梅夏冬辉杨州军陈志鹏丁永华 the j-text team 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

Stabilization of tearing modes and neoclassical tearing modes is of great importance for tokamak *** cyclotron waves(ECWs)have been extensively used to stabilize the tearing modes with the virtue of highly localized power *** suppression of the m/n=2/1 tearing mode(TM)by electron cyclotron resonance heating(ECRH)has been achieved successfully on the j-text *** effects of ECW deposition location and power amplitude on the 2/1 TM suppression have been *** is found that the suppression is more effective when the ECW power is deposited closer to the rational *** the ECW power increases to approximately 230 k W,the 2/1 TM can be completely *** island rotation frequency is increased when the island width is *** experimental results show that the local heating inside the magnetic island and the resulting temperature perturbation increase at the O-point of the island play dominant roles in TM *** the ECW power increases,the 2/1 island is suppressed to smaller island width,and the flow shear also plays a stabilizing effect on small magnetic *** the stabilizing contribution of heating and flow shear,the 2/1 TM can be completely suppressed.

关键词： tearing mode electron cyclotron resonant heating tearing mode suppression

Characteristics of the SOL ion-to-electron temperature ratio on the j-text tokamak with different plasma configurations

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Plasma Science and Technology 2024年第2期26卷 13-21页

作者：李存凯梁云峰江中和周松华建坤阳杰杨庆虎 Alexander KNIEPS Philipp DREWS 徐鑫毛飞越谢伟杨雨桐郭金龙李杨波任正康陈志鹏王能超 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 Forschungszentrum jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Julich 52425Germany 不详

Accurate measurement of the average plasma parameters in the edge region,including the temperature and density of electrons and ions,is critical for understanding the characteristics of the scrape-off layer(SOL) and divertor plasma transport in magnetically confined fusion *** the j-text tokamak,a multi-channel retarding field analyzer(RFA) probe has been developed to study average plasma parameters in the edge region under various poloidal divertor and island divertor *** edge radial profile of the ion-to-electron temperature ratio,τ_(i/e),has been determined,which gradually decreases as the SOL ion self-collisionality,v_(SOL)*,*** is broadly consistent with what has been observed previously from various tokamak ***,the comparison of experimental results under different configurations shows that in the poloidal divertor configuration,even under the same v_(SOL)*,τ_(i/e) in the SOL region becomes smaller as the distance from the X-point to the target plate *** the island divertor configuration,τ_(i/e) near the O-point is higher than that near the X-point at the same v_(SOL)*,and both are higher than those in the limiter *** results suggest that the magnetic configuration plays a critical role in the energy distributions between electrons and ions at the plasma boundary.

关键词： ion temperature island divertor poloidal divertor retarding field analyzer(RFA)probe

Fast Data Processing of a Polarimeter-Interferometer System on j-text

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Plasma Science and Technology 2016年第12期18卷 1143-1147页

作者：刘煜锴高丽刘海庆杨曜高翔 j-text team Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology of China Institute of Fusion and Plasma Research School of Electrical and Electronic EngineeringHuazhong University of Science and Technology

A method of fast data processing has been developed to rapidly obtain evolution of the electron density profile for a multichannel polarimeter-interferometer system（POLARIS）on j-text. Compared with the Abel inversion method, evolution of the density profile analyzed by this method can quickly offer important information. This method has the advantage of fast calculation speed with the order of ten milliseconds per normal shot and it is capable of processing up to 1 MHz sampled data, which is helpful for studying density sawtooth instability and the disruption between shots. In the duration of a flat-top plasma current of usual ohmic discharges on j-text, shape factor u is ranged from 4 to 5. When the disruption of discharge happens, the density profile becomes peaked and the shape factor u typically decreases to 1.

关键词： fast data processing polarimeter-interferometer j-text

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

Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of j-text Tokamak Using Reciprocating Probe

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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

Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in j-text

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Plasma Science and Technology 2021年第5期23卷 49-58页

作者：韩东良沈呈硕王能超李达毛飞越任正康丁永华 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

Magnetohydrodynamic(MHD)instabilities are widely observed during tokamak plasma *** diagnostics provide important information which supports the understanding and control of MHD *** paper presents the current status of the magnetic diagnostics dedicated to measuring MHD instabilities at the j-text tokamak;the diagnostics consist of five Mirnov probe arrays for measuring high-frequency magnetic perturbations and two saddle-loop arrays for low-frequency magnetic perturbations,such as the locked *** recent years,several changes have been made to these *** structure of the probes in the poloidal Mirnov arrays has been optimized to improve their mechanical strength,and the number of in-vessel saddle loops has also been improved to support better spatial *** to the installation of high-field-side(HFS)divertor targets in early 2019,some of the probes were removed,but an HFS Mirnov array was designed and installed behind the *** to its excellent toroidal symmetry,the HFS Mirnov array has,for the first time at j-text,provided valuable new information about the locked mode and the quasi-static mode(QSM)in the ***,various groups of magnetic diagnostics at different poloidal locations have been systematically used to measure the QSM,which confirmed the poloidal mode number m and the helical structure of the *** including the HFS information,the 2/1 resonant magnetic perturbation(RMP)-induced locked mode was measured to have a poloidal mode number m of~2.

关键词： j-text tokamak locked mode magnetic diagnostics magnetohydrodynamic instabilities

An application of the shortest path algorithm for the identification of weak MHD mode

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Plasma Science and Technology 2023年第8期25卷 19-27页

作者：黄卓毛飞越丁永华田微黄名响李达沈呈硕王能超梁云峰 the j-text team 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 Forschungszentrum jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany 不详

The identification of magnetohydrodynamic(MHD)modes is a crucial issue in the control of magnetically confined *** paper proposes a novel method for identifying the evolution of MHD modes from a signal with a low signal-to-noise *** proposed method generates a weighted directed graph from the time-frequency spectrum and calculates the evolution of the mode frequency by solving the shortest *** method addresses the limitations posed by the lack of data channels and the disturbance of noise in the estimation of mode frequency and yields much better results compared to traditional *** is demonstrated that,using this method,the evolution of an unlocked tearing mode was more accurately calculated on the j-text *** method remains feasible even with a low signal-to-noise ratio of 0.5,as shown by its ***,with appropriate parameters,this method can be applied to not only signals with MHD modes,but also to general signals with continuous modes.

关键词： plasma physics magnetohydrodynamic pattern recognition

The anode power supply for the ECRH system on the j-text tokamak

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Plasma Science and Technology 2018年第1期20卷 120-126页

作者：夏冬辉崔芳泰刘昌海余振雄金易坤王之江 j-text team State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Zibo Power Supply Company State Grid Shandong Electric Power Company

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.

关键词： j-text ECRH APS Fiber isolation