Return To: Session EXP2 - Confinement & Transport
Prev Page: (EXP2/12) Highly Radiative Plasmas for Local Transport Studies
Next Page: (EXP2/14) Potential Turbulence in Tokamak Plasmas

(EXP2/13) Investigation of Dimensionless Scaling Laws and Non Local Transport in TORE SUPRA

X. L. Zou, F. Clairet, L. Colas, C. de Michelis, P. Devynck, T. Dudok de Wit¹, M. Erba, C. Fenzi, X. Garbet, A. Geraud, C. Gil, P. Gomez, P. Hennequin², F. Imbeaux, E. Joffrin, C. Laviron, G. Leclert³, M. Mattioli, J. Misguish, M. Paume, A. L. Pecquet, Y. Peysson, R. Sabot, T. F. Seak, J. L. Segui

Association Euratom-CEA sur la fusion contrôlée, C.E. Cadarache, 13108 Saint Paul lez Durance, France
¹ Centre de Physique Théorique Luminy, F-13288 MARSEILLE Cedex 9, France
² Laboratoire PMI, Ecole Polytechnique, 91128 Palaiseau, France
³ LPMI, Université Henri Poincaré, Nancy, 54506 Vandoeuvre Cedex, France

Abstract.  Similarity experiments have been performed in Tore Supra to investigate the dimensionless scaling of transport in stationary regimes. Local and global analyses have shown that in L regimes the electron transport is nearly gyro-Bohm, electromagnetic, and weakly collisional, while in ohmic regimes it is gyro-Bohm, electromagnetic, and strongly collisional. The gyro-Bohm behaviour and electromagnetic nature of the electron transport have been confirmed by the density and magnetic fluctuation measurements. Edge cooling experiments have been carried out in Tore Supra to investigate the transport mechanism. The non local transport phenomenon has been observed in both OH and LH regimes. Thresholds have been obtained for the non local transport appearance on the plasma density, current and the pellet size. This effect is significantly enhanced in the LH heating regime. Experimental observations suggest that the mechanism governing the non local transport is unlikely to be linked to the current effects including the spatial redistribution and the magnetic shear, and the low wavenumber MHD.

Read the full paper in PDF format.