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Improvement (up to a factor of about 4) of the electron-cyclotron (EC) current drive efficiency in plasmas sustained by lower-hybrid (LH) current drive has been demonstrated in stationary conditions on the Tore Supra tokamak. This was made possible by feedback controlled discharges at zero loop voltage, constant plasma current, and constant density. This effect, predicted by kinetic theory, results from a favourable interplay of the velocity space diffusions induced by the two waves: the EC wave pulling low-energy electrons out of the Maxwellian bulk, and the LH wave driving them to high parallel velocities.

Additional information

Authors: GIRUZZI G ET AL, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BRUSCHI A, Istituto di Fisica del Plasma, EURATOM�ENEA�CNR Association Milano (IT);GRANUCCI G, Istituto di Fisica del Plasma, EURATOM�ENEA�CNR Association Milano (IT)
Bibliographic Reference: An article published in: Physical Review Letters, Vol. 93 (2004), p. 255002-1 - 255002-4
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Record Number: 200518069 / Last updated on: 2005-04-19
Original language: en
Available languages: en