Nonlinear vortex chain associated with tearing mode

1994 ◽  
Vol 1 (10) ◽  
pp. 3239-3245 ◽  
Author(s):  
D. Jovanović ◽  
J. Vranješ
Keyword(s):  
Tearing Mode ◽  
Vortex Chain

Activated Prominences; Mechanisms for Activation and Eruption

1979 ◽  
Vol 44 ◽  
pp. 307-313
Author(s):  
D.S. Spicer
Keyword(s):  
Pressure Gradient ◽  
Density Gradient ◽  
Current Density ◽  
Convective Instability ◽  
Tearing Mode ◽  
Magnetic Shear ◽  
Long Wavelength ◽  
Ideal Mhd ◽  
Gradient Change ◽  
Accelerated Particles

A possible relationship between the hot prominence transition sheath, increased internal turbulent and/or helical motion prior to prominence eruption and the prominence eruption (“disparition brusque”) is discussed. The associated darkening of the filament or brightening of the prominence is interpreted as a change in the prominence’s internal pressure gradient which, if of the correct sign, can lead to short wavelength turbulent convection within the prominence. Associated with such a pressure gradient change may be the alteration of the current density gradient within the prominence. Such a change in the current density gradient may also be due to the relative motion of the neighbouring plages thereby increasing the magnetic shear within the prominence, i.e., steepening the current density gradient. Depending on the magnitude of the current density gradient, i.e., magnetic shear, disruption of the prominence can occur by either a long wavelength ideal MHD helical (“kink”) convective instability and/or a long wavelength resistive helical (“kink”) convective instability (tearing mode). The long wavelength ideal MHD helical instability will lead to helical rotation and thus unwinding due to diamagnetic effects and plasma ejections due to convection. The long wavelength resistive helical instability will lead to both unwinding and plasma ejections, but also to accelerated plasma flow, long wavelength magnetic field filamentation, accelerated particles and long wavelength heating internal to the prominence.

scholarly journals Suppression of neoclassical tearing mode instability at the initial stage by electron cyclotron current drive

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035212
Author(s):  
Zhen Yang ◽  
Bin Wu ◽  
Yuanlai Xie ◽  
Yuqing Chen ◽  
Hongming Zhang ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Mode Instability ◽  
Initial Stage ◽  
Neoclassical Tearing Mode

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

Numerical study on neoclassical tearing mode stabilization via minimum seeking method for the island width growth rate

2015 ◽  
Vol 55 (2) ◽  
pp. 023006 ◽  
Author(s):  
M. Kim ◽  
Kyungjin Kim ◽  
M.G. Yoo ◽  
D.H. Na ◽  
T.S. Hahm ◽  
...  
Keyword(s):  
Growth Rate ◽  
Numerical Study ◽  
Tearing Mode ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

Influence of toroidal rotation on the tearing mode in tokamak plasmas

2020 ◽  
Vol 22 (6) ◽  
pp. 065102
Author(s):  
Zhenghao REN ◽  
Jinyuan LIU ◽  
Feng WANG ◽  
Huishan CAI ◽  
Zhengxiong WANG ◽  
...  
Keyword(s):  
Tokamak Plasmas ◽  
Tearing Mode ◽  
Toroidal Rotation

scholarly journals Fitting of the Rutherford Equation for Neoclassical Tearing Mode stabilisation in ASDEX Upgrade

2005 ◽  
Vol 25 ◽  
pp. 266-273 ◽  
Author(s):  
L Urso ◽  
M Maraschek ◽  
H Zohm ◽  
the ASDEX Upgrade Team
Keyword(s):  
Tearing Mode ◽  
Neoclassical Tearing Mode

Effect of poloidal equilibrium flow and pressure gradient on the m/n = 2/1 tearing mode

2022 ◽  
Author(s):  
Yue Ming ◽  
Deng Zhou ◽  
Jinfang Wang
Keyword(s):  
Pressure Gradient ◽  
Stability Index ◽  
Plasma Pressure ◽  
Mode Number ◽  
Pressure Perturbation ◽  
Equilibrium Flow ◽  
Tearing Mode ◽  
Mode Instability ◽  
Mode Stability ◽  
Adverse Influence

Abstract The effect of equilibrium poloidal flow and pressure gradient on the m/n = 2/1 (m is the poloidal mode number and n is the toroidal mode number) tearing mode instability for tokamak plasmas is investigated. Based on the condition of ≠0 ( is plasma pressure), the radial part of motion equation is derived and approximately solved for large poloidal mode numbers (m). By solving partial differential equation (Whittaker equation) containing second order singularity, the tearing mode stability index Δ′ is obtained. It is shown that, the effect of equilibrium poloidal flow and pressure gradient has the adverse effect on the tearing mode instability when the pressure gradient is nonzero. The poloidal equilibrium flow with pressure perturbation partially reduces the stability of the classical tearing mode. But the larger pressure gradient in a certain poloidal flow velocity range can abate the adverse influence of equilibrium poloidal flow and pressure gradient. The numerical results do also indicate that the derivative of pressure gradient has a significant influence on the determination of instability region of the poloidal flow with pressure perturbation.

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