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The Effect of Equilibrium Current Profiles on mhd Instabilities in Tokamaks

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Plasma Science and Technology 2012年第1期14卷 14-19页

作者： LI Li LIU Yue XU Xinyang XIA Xinnian Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024China

A cylindrical model of linear mhd instabilities in tokamaks is presented. In the model, the cylindrical plasma is surrounded by a vacuum which is divided into inner and outer vacuum areas by a conducting wall. Linearized resistivity mhd equations with plasma viscosity are adopted to describe our model, and the equations are solved numerically as an initial value problem. Some of the results are used as benchmark tests for the code, and then a series of equilibrium current profiles are used to simulate the bootstrap current profiles in actual experiments with a bump on tail. Thus the effects of these kinds of profiles on mhd instabilities in tokamaks are revealed. From the analysis of the numerical results, it is found that more plasma can be confined when the center of the current bump is closer to the plasma surface, and a higher and narrower current bump has a better stabilizing effect on the mhd instabilities.

关键词： equilibrium current profile mhd instability bootstrap current tokamak

Internal Magnetic Configuration Measured by ECE Imaging on EAST Tokamak

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Plasma Science and Technology 2013年第12期15卷 1189-1193页

作者：徐明闻一之谢锦林俞昌旋高炳西徐小圆刘万东胡立群孙有文钱金平万宝年 CAS Key Laboratory of Plasma Physics University of Science and Technology of China Institute of Plasma Physics Chinese Academy of Sciences

ECE imaging （electron cyclotron emission imaging） is an important diagnostic which can give 2D imaging of temperature fluctuation in the core of tokamak. A method based on ECE imaging is introduced which can give the information of the position of magnetic axis and the structure of internal magnetic surface for EAST tokamak. The EFIT equilibrium reconstruction is not reliable due to the absence of important core diagnostic at the initial phase for EAST, so the information given by ECE imaging could help to improve the accuracy of EFIT equilibrium reconstruction.

关键词： mhd instability internal magnetic configuration ECE imaging

Identification and Analysis of Magnetic Structures on HL-2A

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Plasma Science and Technology 2006年第6期8卷 644-648页

作者：季小全杨青巍冯北滨周航宇袁保山陈伟杨州军 Huazhong University of Science and Technology Wuhan 430074China Southwestern Institute of Physics Chengdu 610041China

A method for the identification and analysis of magnetic islands is presented based on the calculation of the perturbative current and magnetic field in plasmas. A cylindrical approximation is adopted and the toroidal effect on plasma equilibrium is also included. This method has been used on the HL-2A tokamak for analysing the magnetic island structures.

关键词： HL-2A tokamak tearing mode magnetic island mhd instability

Alfvén Instabilities Excited by Energetic Particles in a Parameter Regime Similar to EAST Operation

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Plasma Science and Technology 2013年第8期15卷 750-754页

作者：王军胡纯栋胡双辉吴斌丁斯晔 Institute of Plasma Physics Chinese Academy of Sciences College of Science Guizhou University

The kinetic excitation of ideal magnetohydrodynamic （mhd） Alfvén instabilities is investigated for operations at the EAST tokamak. The instabilities include α-induced toroidal Alfvén eigenmodes （αTAE; here, α =-q2 Rdβ/dr, with q being the safety factor, β the ratio between the plasma and magnetic pressures, R the major radius, and r the minor radius）, toroidicity-induced Alfvén eigenmodes （TAE）, and the energetic particle continuum mode （EPM）. The αTAE, trapped by α-induced potential wells along the magnetic field line, can be readily destabilized by energetic particles due to negligible continuum damping via wave energy tunneling. It is shown for the geometry and the parameters similar to those of the EAST equilibrium that αTAE is different not only from the EPM by the potential-well determined frequency, but also from the TAE by the broad frequency spectrum outside the toroidal frequency gap.

关键词： energetic particles Alfvén wave mhd instability

Preliminary Study of Ideal Operational mhd Beta Limit in HL-2A Tokamak Plasmas

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Plasma Science and Technology 2009年第2期11卷 131-136页

作者：沈勇董家齐何宏达 A.D.TURNBULL Southwestern Institute of Physics Zhejiang University General Atomics

Magnetohydrodynamic （mhd） n=1 kink mode with n the toroidal mode number is studied and the operational beta limit, constrained by the mode, is calculated for the equilibrium of HL-2A by using the GATO code. Approximately the same beta limit is obtained for configurations with a value of the axial safety factor q0 both larger and less than 1. Without the stabilization of the conducting wall, the beta limit is found to be 0.821% corresponding to a normalized beta value of βN^c=2.56 for a typical HL-2A discharge with a plasma current Ip=0.245 MA, and the scaling of βN^c -constant is confirmed.

关键词： mhd instability HL-2A tokamak beta limit

Effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes in tokamak plasmas

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Plasma Science and Technology 2022年第5期24卷 87-93页

作者： Shuai JIANG Weikang TANG Lai WEI Tong LIU Haiwen XU Zhengxiong WANG Key Laboratory of Materials Modiﬁcation by Beams of the Ministry of Education School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China

The effects of plasma radiation on the nonlinear evolution of neo-classical tearing modes are investigated based on a set of reduced magnetohydrodynamic *** is found that the radiation can reduce the pressure near the rational *** the nonlinear evolution,the magnitude of perturbed bootstrap current is drastically enhanced in the presence of the ***,the radiation can increase the growth rate of the magnetic islands by diminishing the pressure,such that the magnetic islands do not saturate compared with that without *** the other hand,with the increase of the ratio of parallel to perpendicular transport coefficientχ‖/χ⊥,the reduction of pressure can further increase the growth rate of magnetic islands in the presence of plasma ***,the mechanisms of the destabilizing effects driven by the radiation are discussed in detail as well.

关键词： neo-classical tearing mode radiation mhd instability

Primary Results of Liquid Metal Free Surface Jet Research

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Southwestern Institute of Physics Annual Report

Southwestern Institute of Physics Annual Report 2004年第1期 101-102页

作者： XU Zengyu PAN Chanjie KANG Weishan

The liquid metal free surface innovation concept have been considered as liquid metal devices of divertor/limiter and tile of first wall in fusion device because it can withstand over 50 MW·m^2 heating load, is easily renewed by circulation and many overcome neutron irradiation damage life time limit. There are three types of free surface in the innovation concept as film, curtain （jets or drops） and capillary. The free surface jet is played a more attention at present. But it is no so clear and only a few available data that their magneto-hydrodynamics （mhd） instabilities, interaction with plasma and exclusion of the particles （ions, Alpha particles and so on） from liquid metal, in despite of many liquid metal free surface facilities built and operated especially in US in last two years. Recently, some primary results are carried out at LMEL facility at Southwestern Institute of Physics.

关键词： LM free surface mhd instability The gradient magnetic field