Numerical investigation of the 2/1 double tearing mode in EAST with the CLT code
Source abstract
Abstract
The pressure crashes observed in shot No. 71326 in the Experimental Advanced Superconducting Tokamak are numerically investigated with the three-dimensional, toroidal, and full resistive-magnetohydrodynamics code (CLT). Based on the experimental observations, the pressure crash is caused by the nonlinear evolution of the m/n = 2/1 double tearing mode (DTM), where n and m are the toroidal and poloidal mode numbers, respectively. However, we find that the m/n = 2/1 DTM is stable based on the safety factor (q) profile from the equilibrium code EFIT, which indicates that the original q profile is somewhat inconsistent with the actual profile due to q measurement uncertainty. Since there is no motional Stark effect diagnostic for this shot, the local information of the magnetic field is missing, which leads to the largest contribution to the discrepancy. If other information is perfectly known and the q profile is the only uncertainty, then we could provide some information for the EFIT reconstruction by comparing our simulation results with electron cyclotron emission signals to constrain the uncertainty of the q profile to a much smaller region. The influence of plasma rotation and the two-fluids effect is also discussed.
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Research context
OpenAlex topics: Magnetic confinement fusion research · Superconducting Materials and Applications · Ionosphere and magnetosphere dynamics
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Affiliations
Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China 1 , Anhui, Hefei 230026, China
Department of Physics, Institute for Fusion Theory and Simulation, Zhejiang University 2 , Hangzhou 310027, China
Institute of Plasma Physics, Chinese Academy of Sciences 3 , Anhui, Hefei 230031, China
Funding
National Magnetic Confinement Fusion Program of China · National Natural Science Foundation of China · Hefei Science Center, Chinese Academy of Sciences
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Show source-provided references
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