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Abstract

Localized currents due to electron cyclotron current drive have been measured for the first time in experiments on the DIII-D tokamak. The location of the driven current in the plasma has been varied from near the centre of the tokamak out to half of the minor radius. The measured current drive efficiency agrees with quasilinear Fokker-Planck calculations near the centre and exceeds the predicted value with increasing minor radius. Reduction of the trapped electron fraction due to finite collisionality is a leading candidate to explain the discrepancy.

Additional information

Authors: LUCE T C, General Atomics, San Diego, California (US);LIN-LIU Y R, General Atomics, San Diego, California (US);POLITZER P A, General Atomics, San Diego, California (US);LOHR J M, General Atomics, San Diego, California (US);PETTY C C, General Atomics, San Diego, California (US);PRATER R, General Atomics, San Diego, California (US);HARVEY R W, CompX, Del Mar, California (US), CEA-Centre d'tudes de Cadarache, Saint-Paul-Lez-Durance (FR);GIRUZZI G, Lawrence Livermore National Laboratory, Livermore, California (US);RICE B W,
Bibliographic Reference: Article: Physical Review Letters, Vol. 83 (1999) No. 22, pp. 4550-4553
Availability: Physical Review Letters (Journal)
Record Number: 200012739 / Last updated on: 2000-09-08
Category: PUBLICATION
Original language: en
Available languages: en