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Sawtooth-like oscillations and steady states caused by the m/n=2/1 double tearing mode

Plasma Science and Technology 2022年第3期24卷 89-97页

作者： Wei ZHANG Zhiwei MA Haowei ZHANG Xin WANG Institute for Fusion Theory and Simulation Department of PhysicsZhejiang UniversityHangzhou 310027People's Republic of China

The sawtooth-like oscillations resulting from the m/n=2/1 double tearing mode(DTM)are numerically investigated through the three-dimensional,toroidal,nonlinear resistive-MHD code(CLT).We find that the nonlinear evolution of the m/n=2/1 DTM can lead to sawtooth-like oscillations,which are similar to those driven by the kink *** perpendicular thermal conductivity and the external heating rate can significantly alter the behaviors of the DTM driven sawtooth-like *** a high perpendicular thermal conductivity,the system quickly evolves into a steady state with m/n=2/1 magnetic islands and helical ***,with a low perpendicular thermal conductivity,the system tends to exhibit sawtooth-like *** a sufficiently high or low heating rate,the system exhibits sawtooth-like oscillations,while with an intermediate heating rate,the system quickly evolves into a steady *** the steady state,there exist the non-axisymmetric magnetic field and strong radial flow,and both are with helicity of m/n=2/*** the steady state with m/n=1/1 radial flow,which is beneficial for preventing the helium ash accumulation in the core,the steady state with m/n=2/1 radial flow might also be a good candidate for the advanced steady state operations in future fusion *** also find that the behaviors of the sawtooth-like oscillations are almost independent of tokamak geometry,which implies that the steady state with saturated m/n=2/1 islands might exist in different tokamaks.

关键词： DTM reversed magnetic shear pressure crash sawteeth sawtooth double tearing mode steady state advanced scenario

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