scholarly journals An improved neoclassical drift-magnetohydrodynamical fluid model of helical magnetic island equilibria in tokamak plasmas

2016 ◽  
Vol 23 (5) ◽  
pp. 052506 ◽  
Author(s):  
Richard Fitzpatrick
Keyword(s):  
Fluid Model ◽  
Tokamak Plasmas ◽  
Magnetic Island

scholarly journals Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minjun J. Choi ◽  
Lāszlo Bardōczi ◽  
Jae-Min Kwon ◽  
T. S. Hahm ◽  
Hyeon K. Park ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nonlinear Evolution ◽  
Plasma Turbulence ◽  
Magnetized Plasmas ◽  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Reconnection Site ◽  
Ambient Turbulence

AbstractMagnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the interaction between an MI and ambient turbulence can be important for the nonlinear MI evolution, but a lack of detailed experimental observations and analyses has prevented further understanding. Here, we provide comprehensive observations such as turbulence spreading into an MI and turbulence enhancement at the reconnection site, elucidating intricate effects of plasma turbulence on the nonlinear MI evolution.

scholarly journals Scrape-off-layer current loops and floating potential in limited tokamak plasmas

2017 ◽  
Vol 83 (6) ◽  
Author(s):  
J. Loizu ◽  
J. A. Morales ◽  
F. D. Halpern ◽  
P. Ricci ◽  
P. Paruta
Keyword(s):  
Fluid Model ◽  
Radial Profile ◽  
Floating Potential ◽  
Tokamak Plasmas ◽  
Fluid Turbulence ◽  
Two Fluid Model ◽  
The One ◽  
Dipolar Structure ◽  
Two Fluid ◽  
Asymmetric Equilibrium

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents that are not divergence-free. These include turbulence-driven polarization currents and poloidally asymmetric equilibrium diamagnetic currents. The theory provides an estimate for the radial profile of the floating potential, which reveals a dipolar structure like the one observed experimentally. Simulations with a fluid turbulence code provide evidence for the predicted behaviour of currents and floating potential.

Linear Analysis of the Interaction of Rotating Helical Magnetic Perturbations with Tokamak Plasmas Based on the Reduced Two-Fluid Model

2006 ◽  
Vol 46 (7-9) ◽  
pp. 539-544 ◽  
Author(s):  
Y. Kikuchi ◽  
K. H. Finken ◽  
M. Jakubowski ◽  
M. Lehnen ◽  
D. Reiser ◽  
...  
Keyword(s):  
Fluid Model ◽  
Linear Analysis ◽  
Tokamak Plasmas ◽  
Magnetic Perturbations ◽  
Two Fluid Model ◽  
Two Fluid

Generation of a magnetic island by edge turbulence in tokamak plasmas

2015 ◽  
Vol 22 (3) ◽  
pp. 030704 ◽  
Author(s):  
A. Poyé ◽  
O. Agullo ◽  
M. Muraglia ◽  
X. Garbet ◽  
S. Benkadda ◽  
...  
Keyword(s):  
Tokamak Plasmas ◽  
Magnetic Island

Transport properties of the interacting magnetic‐island model of tokamak plasmas

1994 ◽  
Vol 1 (7) ◽  
pp. 2245-2253 ◽  
Author(s):  
T. A. Gianakon ◽  
J. D. Callen ◽  
C. C. Hegna
Keyword(s):  
Transport Properties ◽  
Island Model ◽  
Tokamak Plasmas ◽  
Magnetic Island

Observation and theory of nonlinear mode couplings between shear Alfvén wave and magnetic island in tokamak plasmas

2014 ◽  
Vol 107 (2) ◽  
pp. 25001 ◽  
Author(s):  
W. Chen ◽  
Z. Qiu ◽  
X. T. Ding ◽  
H. S. Xie ◽  
L. M. Yu ◽  
...  
Keyword(s):  
Alfven Wave ◽  
Tokamak Plasmas ◽  
Magnetic Island ◽  
Nonlinear Mode
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