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The global energy confinement of combined ohmic and lower hybrid driven Tore Supra plasmas has been analysed at various densities. In contradiction to the L-mode ITER scaling law, this analysis indicates that the global energy confinement time strongly depends on the plasma density. Furthermore, no isotopic dependence has been observed and the thermal electron energy content of steady-state discharges is found to be in good agreement with the global Rebut-Lallia scaling law. Current ramp experiment results show an enhancement of the global energy confinement with the internal inductance. These results have been extended to steady-state regimes with lower hybrid current drive. Improved confinement has been obtained in a steady-state plasma with high internal inductance, where the plasma current density profile has been modified by lower hybrid waves. In this case, the global confinement time is shown to exceed by 40 % the value predicted by the Rebut-Lallia scaling law.

Additional information

Authors: HOANG G T ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);BUDNY R V, Plasma Physics Laboratory, Princeton (US);KAYE S, Plasma Physics Laboratory, Princeton (US);SABBAGH S A, Columbia University, Department of Applied Physics, New York (US)
Bibliographic Reference: Report: EUR-CEA-FC-1479 EN (1993) 25 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
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