The off-axis pressure crash associated with the nonlinear evolution of the m/n = 2/1 double tearing mode

2020 ◽  
Vol 27 (12) ◽  
pp. 122509
Author(s):  
W. Zhang ◽  
X. Lin ◽  
Z. W. Ma ◽  
X. Q. Lu ◽  
H. W. Zhang
Keyword(s):  
Nonlinear Evolution ◽  
Tearing Mode

scholarly journals Nonlinear evolution of resistive tearing mode instability with shear flow and viscosity

1993 ◽  
Vol 5 (2) ◽  
pp. 376-387 ◽  
Author(s):  
L. Ofman ◽  
P. J. Morrison ◽  
R. S. Steinolfson
Keyword(s):  
Shear Flow ◽  
Nonlinear Evolution ◽  
Tearing Mode ◽  
Mode Instability

Nonlinear evolution of the resistive tearing mode

1984 ◽  
Vol 27 (5) ◽  
pp. 1207 ◽  
Author(s):  
R. S. Steinolfson ◽  
G. Van Hoven
Keyword(s):  
Nonlinear Evolution ◽  
Tearing Mode

Turbulent excitation of spontaneous reconnection

1989 ◽  
Vol 42 (2) ◽  
pp. 269-290 ◽  
Author(s):  
D. Deeds ◽  
G. Van Hoven
Keyword(s):  
Nonlinear Evolution ◽  
Turbulence Energy ◽  
Tearing Mode ◽  
Computational System ◽  
Turbulent Environment ◽  
Tearing Instability ◽  
Magnetic Tearing ◽  
The Relationship ◽  
Initial Turbulence

We explore the long-term nonlinear evolution of a tearing-mode-unstable sheared-field plasma in a turbulent environment. Two different physical configurations are modeled, and a different computational system is used for each. Results of both sets of calculations show that magnetic tearing arises spontaneously provided that the initial turbulence energy level is below the natural saturation level of the tearing instability.We discuss briefly the relationship between our results and those of previous calculations, concluding that there are no significant unexplainable disagreements.

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

2022 ◽  
Author(s):  
Wei Zhang ◽  
Zhiwei Ma ◽  
Haowei Zhang ◽  
Xin Wang
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Heating Rate ◽  
Radial Flow ◽  
Nonlinear Evolution ◽  
Three Dimensional ◽  
Fusion Reactors ◽  
Magnetic Islands ◽  
Tearing Mode ◽  
Kink Mode

Abstract 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 mode. The perpendicular thermal conductivity and the external heating rate can significantly alter the behaviors of the DTM driven sawtooth-like oscillations. With a high perpendicular thermal conductivity, the system quickly evolves into a steady state with m/n=2/1 magnetic islands and helical flow. However, with a low perpendicular thermal conductivity, the system tends to exhibit sawtooth-like oscillations. With 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 state. At the steady state, there exist the non-axisymmetric magnetic field and strong radial flow, and both are with helicity of m/n=2/1. Like 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 reactors. We 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.

Nonlinear evolution and secondary island formation of the double tearing mode in a hybrid simulation

2021 ◽  
Vol 23 (3) ◽  
pp. 035103
Author(s):  
Aohua MAO ◽  
Zhibin WANG ◽  
Xianglei HE ◽  
Xiaogang WANG
Keyword(s):  
Nonlinear Evolution ◽  
Hybrid Simulation ◽  
Tearing Mode ◽  
Island Formation
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