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Abstract

Lower hybrid current drive (LHCD) experiments performed in Tore Supra are reported. Using two large multijunction launchers, up to 6 MW have been coupled to the plasma. Stable LH current ramp-up assist was achieved. Experiments with combined LHCD and ion cyclotron resonant heating injected up to 7.5 MW into the plasma. LH power modulation experiments showed a delayed central electron heating despite the off-axis creation of suprathermal electrons, thus ruling out the possibility of direct heating through central wave absorption. Successful pellet fuelling of a partially LH driven plasma was obtained, in which 28 successive pellets could penetrate up to half radius as in ohmic discharges, with 50 to 80% of the pellet content deposited in the plasma. First attempts to combine LHCD with ergodic divertor discharges showed that, when the plasma edge was subject to a radial magnetic perturbation smaller than the ergodicity threshold, a strong stationary radiation (Marfe) was triggered, locked near the inner wall. The radiated power then amounted to 90% of the total input power with no indication of a radiative collapse.

Additional information

Authors: MOREAU D, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);TORE SUPRA TEAM, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 33rd Annual Meeting of the Division of Plasma Physics of the American Physical Society, Tampa (US), Nov. 4-8, 1991
Availability: Available from (1) as Paper EN 36447 ORA
Record Number: 199210473 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en