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

Effects of velocity shear and magnetic shear in the formation of core transport barriers in the DIII-D tokamak

1998 ◽  
Vol 40 (9) ◽  
pp. 1585-1596 ◽  
Author(s):  
K H Burrell ◽  
M E Austin ◽  
C M Greenfield ◽  
L L Lao ◽  
B W Rice ◽  
...  
Keyword(s):  
Velocity Shear ◽  
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.

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 Stability and transport of parallel velocity shear driven mode with negative magnetic shear

2000 ◽  
Vol 7 (4) ◽  
pp. 1192-1195 ◽  
Author(s):  
S. Sen ◽  
R. A. Cairns ◽  
R. G. Storer ◽  
D. R. McCarthy
Keyword(s):  
Velocity Shear ◽  
Magnetic Shear

Reduction in transport by the parallel velocity shear instability due to reversed magnetic shear

2001 ◽  
Vol 8 (8) ◽  
pp. 3645-3651 ◽  
Author(s):  
D. R. McCarthy ◽  
E. J. Fuselier ◽  
S. Sen
Keyword(s):  
Velocity Shear ◽  
Shear Instability ◽  
Magnetic Shear

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.

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