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Recent results on feedback control of the global shape of the current density profile in discharges with lower hybrid current drive (LHCD) on Tore Supra are presented. The global shape of the current density profile is characterized by its internal inductance l(i), and feedback controlled through the lower hybrid (LH) power or the launched LH wave spectrum. Feedback control of the flux on the plasma boundary has allowed for exploration of regimes with partial current drive (constant loop voltage) and full current drive (zero loop voltage). In stationary, steady state discharges at 0.8 MA, the current profile shape is characterized by an l(i) between 1.5 and 1.7 and a safety factor on-axis between 1 and 1.4. The energy confinement is 1.3 to 1.6 times higher than the value predicted by the Rebut-Lallia-Watkins scaling law.

Additional information

Authors: WIJNANDS T, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);VAN HOUTTE D, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);MARTIN G, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);LITAUDON X, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);FROISSARD P, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 37 (1997) No. 6, pp. 777-791
Record Number: 199711494 / Last updated on: 1997-11-18
Original language: en
Available languages: en
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