Heat Convection and Transport Barriers in Low-Magnetic-Shear Rijnhuizen Tokamak Project Plasmas

2000 ◽  
Vol 85 (21) ◽  
pp. 4534-4537 ◽  
Author(s):  
P. Mantica ◽  
G. Gorini ◽  
G. M. D. Hogeweij ◽  
N. J. Lopes Cardozo ◽  
A. M. R. Schilham
Keyword(s):  
Heat Convection ◽  
Magnetic Shear ◽  
Transport Barriers

scholarly journals Suppressing electron turbulence and triggering internal transport barriers with reversed magnetic shear in the National Spherical Torus Experiment

2012 ◽  
Vol 19 (5) ◽  
pp. 056120 ◽  
Author(s):  
J. L. Peterson ◽  
R. Bell ◽  
J. Candy ◽  
W. Guttenfelder ◽  
G. W. Hammett ◽  
...  
Keyword(s):  
Spherical Torus ◽  
Magnetic Shear ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Internal Transport

Transport barriers with magnetic shear in a tokamak

2007 ◽  
Vol 73 (4) ◽  
pp. 439-453 ◽  
Author(s):  
M. EL MOUDEN ◽  
D. SAIFAOUI ◽  
A. DEZAIRI ◽  
B. ZINE ◽  
M. EDDAHBY
Keyword(s):  
Anomalous Transport ◽  
Particle Diffusion ◽  
Magnetic Shear ◽  
Transport Barriers ◽  
Simulation Results ◽  
Reversed Shear

AbstractThe reversed magnetic shear is the most important factor in the study of the plasmas of a tokamak. In this paper we focus our research, as a first stage, on the control of the improved confinement regimes by studying the influence of the reversed shear on its quality in the plasma of a tokamak and especially in reducing the anomalous transport in ITER. Then we study the influence of the perturbation modes on the particle diffusion. At the end, a comparison between simulation results obtained using ITER and TEXT parameters is carried out.

scholarly journals Tokamak Edge Plasma Turbulence Interaction with Magnetic X-Point in 3D Global Simulations

Fluids ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 50 ◽  
Author(s):  
Davide Galassi ◽  
Guido Ciraolo ◽  
Patrick Tamain ◽  
Hugo Bufferand ◽  
Philippe Ghendrih ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Edge Plasma ◽  
Turbulent Structures ◽  
Magnetic Shear ◽  
Transport Barrier ◽  
Fluid Turbulence ◽  
Transport Barriers ◽  
Tokamak Edge ◽  
The Impact

Turbulence in the edge plasma of a tokamak is a key actor in the determination of the confinement properties. The divertor configuration seems to be beneficial for confinement, suggesting an effect on turbulence of the particular magnetic geometry introduced by the X-point. Simulations with the 3D fluid turbulence code TOKAM3X are performed here to evaluate the impact of a diverted configuration on turbulence in the edge plasma, in an isothermal framework. The presence of the X-point is found, locally, to affect both the shape of turbulent structures and the amplitude of fluctuations, in qualitative agreement with recent experimental observations. In particular, a quiescent region is found in the divertor scrape-off layer (SOL), close to the separatrix. Globally, a mild transport barrier spontaneously forms in the closed flux surfaces region near the separatrix, differently from simulations in limiter configuration. The effect of turbulence-driven Reynolds stress on the formation of the barrier is found to be weak by dedicated simulations, while turbulence damping around the X-point seems to globally reduce turbulent transport on the whole flux surface. The magnetic shear is thus pointed out as a possible element that contributes to the formation of edge transport barriers.

Toroidal equilibrium states with reversed magnetic shear and parallel flow in connection with the formation of Internal Transport Barriers

2015 ◽  
Vol 81 (4) ◽  
Author(s):  
Ap. Kuiroukidis ◽  
G. N. Throumoulopoulos
Keyword(s):  
Magnetic Field ◽  
Linear Stability ◽  
Current Density ◽  
Sufficient Condition ◽  
Magnetic Shear ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
The Stability ◽  
The Magnetic Field ◽  
Internal Transport

We construct nonlinear toroidal equilibria of fixed diverted boundary shaping with reversed magnetic shear and flows parallel to the magnetic field. The equilibria have hole-like current density and the reversed magnetic shear increases as the equilibrium nonlinearity becomes stronger. Also, application of a sufficient condition for linear stability implies that the stability is improved as the equilibrium nonlinearity correlated to the reversed magnetic shear gets stronger with a weaker stabilizing contribution from the flow. These results indicate synergetic stabilizing effects of reversed magnetic shear, equilibrium nonlinearity and flow in the establishment of Internal Transport Barriers (ITBs).

scholarly journals Effects of ExB Velocity Shear and Magnetic Shear in the Formation of Core Transport Barriers in the DIII-D Tokamak

1997 ◽  
Author(s):  
K.H. Burrell ◽  
C.M. Greenfield ◽  
L.L. Lao ◽  
G.M. Staebler ◽  
M.E. Austin ◽  
...  
Keyword(s):  
Velocity Shear ◽  
Magnetic Shear ◽  
Transport Barriers

Physics of strong internal transport barriers in JT-60U reversed-magnetic-shear plasmas

2006 ◽  
Vol 48 (5A) ◽  
pp. A55-A61 ◽  
Author(s):  
N Hayashi ◽  
T Takizuka ◽  
Y Sakamoto ◽  
T Fujita ◽  
Y Kamada ◽  
...  
Keyword(s):  
Magnetic Shear ◽  
Transport Barriers ◽  
Internal Transport Barriers ◽  
Internal Transport

Vanishing Magnetic Shear And Electron Transport Barriers In The RFX-Mod Reversed Field Pinch

2011 ◽  
Vol 106 (2) ◽  
Author(s):  
M. Gobbin ◽  
D. Bonfiglio ◽  
D. F. Escande ◽  
A. Fassina ◽  
L. Marrelli ◽  
...  
Keyword(s):  
Electron Transport ◽  
Reversed Field Pinch ◽  
Magnetic Shear ◽  
Transport Barriers ◽  
Reversed Field
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