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Recent lower hybrid and ion cyclotron heating experiments are reported with emphasis on phenomena related to profile control and having stationary potentialities. Long pulse operation (67 seconds, 1 MA) has been very successful, with an equivalent of 41 Wb saved. Flux consumption during current ramp-up is investigated and a scaling based on 1-D theory is given and compared with experimental results. The existence of a stationary, enhanced performance regime (LHEP) with improved confinement and reduced magnetic shear inside a high temperature gradient zone (q(0) approximately equal to 1.2, T(e0) approximately equal to 8 - 10 keV) has been found, showing complete decoupling between the electron temperature and current density profiles. The beneficial effect of boron carbide coating on the ICRH Faraday screens is assessed. The duration of sawtooth-free periods increased and reached 830 ms during combined ICRH/LH operation.

Additional information

Authors: MOREAU D ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);HASTE G, Oak Ridge National Laboratory, Tennessee (US)
Bibliographic Reference: Paper presented: 14th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Würzburg (DE), September 30 - October 7, 1992
Availability: Available from (1) as Paper EN 37033 ORA
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