FIZIKA A 14 (2005)  4, 277 - 288

USE OF MAGNETIC SHEAR FOR THE IMPROVEMENT OF QUALITY OF CONFINEMENT IN THE PLASMA OF TOKAMAK

M. EL MOUDEN^a, D. SAIFAOUI^a,1, A. DEZAIRI^b and H. IMZI^a

^aLaboratory of Theoretical Physics, Faculty of Sciences - Ain Chock, Casablanca, Morocco
^bLaboratory of the Physics of Condensed Matter, Faculty of Sciences - Ben M'sik, Casablanca, Morocco
¹Corresponding author; E-mail address: dsaifaoui@caramail.com

Received 21 July 2004;  revised manuscript received 17 March 2005
Accepted 6 June 2005     Online 16 February 2006

We investigate the influence of reversed shear on the improvement of the confinement's quality in the plasma of a tokamak, specifically in reducing the anomalous transport. We use a special model for the drift wave fields. Comparison between the particle trajectories for normal and reversed shear is carried out in 2D and 3D presentation. The diffusion coefficient of particles and the radial electric field for the two cases, normal and negative shear, have been evaluated.

PACS numbers: 52.55.Fa, 52.55.Dy, 52.25.Fi
UDC 533.95, 533.93

Keywords: plasma confinement, tokamak, anomalous transport, magnetic shear, transport barrier, particle diffusion, radial electric field, enhanced confinement

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