Magnetic island evolution in the presence of ion-temperature gradient-driven turbulence

2013 ◽  
Vol 20 (12) ◽  
pp. 122301 ◽  
Author(s):  
A. Ishizawa ◽  
F. L. Waelbroeck
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Magnetic Island ◽  
Ion Temperature Gradient ◽  
Island Evolution

The effects of magnetic island on toroidal ion temperature gradient mode instability

2021 ◽  
Author(s):  
Guodong Zhang ◽  
Weixin Guo ◽  
Lu Wang
Keyword(s):  
Growth Rate ◽  
Temperature Gradient ◽  
Kinetic Equations ◽  
Plasma Pressure ◽  
Linear Growth Rate ◽  
Ion Temperature ◽  
Magnetic Island ◽  
Mode Structure ◽  
Ion Temperature Gradient ◽  
Eigen Value

Abstract In this work, we have investigated the influences of magnetic island (MI) on electrostatic toroidal ion temperature gradient (ITG) mode, where the ions are described by gyro-kinetic equations including MI, and adiabatic approximation is used for electrons. The eigen-equation for short-wavelength toroidal ITG mode in Fourier-ballooning representation is derived, and the corresponding eigen-value as well as mode structure are solved. Both the flattening effects of MI on plasma pressure and MI-scale shear flow are considered. It is found that when only considering the flattening effects of MI, ITG mode can be stabilized as compared to the case without MI. While, the effective drive of toroidal ITG mode could be enhanced by including MI-scale flow, which indicates the dominant destabilizing by MI-scale flow over the stabilizing by flattening profile and results in higher growth rate than the case without MI. It is also found that the total flow shearing may prevent the ITG turbulence spreading from X-point of MI but not strong enough to prevent spreading from the seperatrix across O-point of larger MI via comparison between the flow shearing rate and the linear growth rate. Furthermore, the corresponding width of lowest-order mode structure in ballooning angle is slightly widened (narrowed) for the case without (with) MI-scale flow, as compared to the case without MI. Besides, the shifted even symmetry in ballooning angle is not qualitatively influenced by the presence of MI. The mode structure is radially asymmetric, but is symmetric with respect to the phase of MI at the O-point.

On the threshold of magnetic island width in nonlinear mutual destabilization of tearing mode and ion temperature gradient mode

2016 ◽  
Vol 23 (10) ◽  
pp. 102508 ◽  
Author(s):  
T. Liu ◽  
Z. X. Wang ◽  
Z. Q. Hu ◽  
L. Wei ◽  
J. Q. Li ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Tearing Mode ◽  
Magnetic Island ◽  
Ion Temperature Gradient ◽  
Gradient Mode

Magnetic-island-induced ion temperature gradient mode: Landau damping, equilibrium magnetic shear and pressure flattening effects

2018 ◽  
Vol 20 (7) ◽  
pp. 075101 ◽  
Author(s):  
Wei WANG ◽  
Zhengxiong WANG ◽  
Jiquan LI ◽  
Yasuaki KISHIMOTO ◽  
Jiaqi DONG ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Landau Damping ◽  
Ion Temperature ◽  
Magnetic Island ◽  
Magnetic Shear ◽  
Ion Temperature Gradient ◽  
Gradient Mode

Magnetic-island-induced ion temperature gradient mode

2009 ◽  
Vol 16 (6) ◽  
pp. 060703 ◽  
Author(s):  
Z. X. Wang ◽  
J. Q. Li ◽  
Y. Kishimoto ◽  
J. Q. Dong
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Magnetic Island ◽  
Ion Temperature Gradient ◽  
Gradient Mode

scholarly journals Dynamics of ion temperature gradient turbulence and transport with a static magnetic island

2016 ◽  
Vol 23 (2) ◽  
pp. 022304 ◽  
Author(s):  
Olivier Izacard ◽  
Christopher Holland ◽  
Spencer D. James ◽  
Dylan P. Brennan
Keyword(s):  
Temperature Gradient ◽  
Ion Temperature ◽  
Magnetic Island ◽  
Ion Temperature Gradient

scholarly journals Short wavelength ion temperature gradient turbulence

2012 ◽  
Vol 19 (10) ◽  
pp. 102508 ◽  
Author(s):  
J. Chowdhury ◽  
S. Brunner ◽  
R. Ganesh ◽  
X. Lapillonne ◽  
L. Villard ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Short Wavelength ◽  
Ion Temperature ◽  
Ion Temperature Gradient
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