Thermal Electron Transport in the Regimes with Low and Negative Magnetic Shear on Tore Supra
This paper presents the results of a study of the magnetic shear effect on the thermal electron transport in a large variety of non-inductive plasmas of Tore Supra. An improved confinement in the region of low and negative shear was observed and quantified with an exponential dependence on the magnetic shear. This in interpreted as the consequence of a decoupling of the global modes which are thought to be responsible for anomalous transport. This dependence is proposed to complete the Bohm-like L-mode local electron thermal diffusivity to describe the transition from the Bohm-like to the gyroBohm transport in the plasma core. The predictive simulations and experimental data gives a basis for the extrapolation of this magnetic shear dependence in the local transport coefficients for future machines. As an example a scenario for non-inductive current profile optimization and control in ITER is presented.
Bibliographic Reference: Report: EN (1997) 51pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
Record Number: 199710649 / Last updated on: 1997-06-09
Original language: en
Available languages: en