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Abstract

Noninductive current drive has been performed in the tokamak ASDEX Upgrade by injection of radiofrequency waves at the second harmonic of the electron-cyclotron frequency in order to suppress unwanted disturbances of the magnetic-field configuration. The current has been driven parallel [co-electron cyclotron drive (ECCD)] and anti-parallel (counter-ECCD) to the plasma current to compare the effect of heating with direct current drive in the magnetic island. For the first time it has been shown experimentally that total stabilization of neoclassical tearing modes is possible with co-ECCD. The experiments verify the role of direct current drive as opposed to local heating.

Additional information

Authors: GANTENBEIN G, Institut f³r Plasmaforschung, Universitõt Stuttgart, Stuttgart (DE);ZOHM H, Institut f³r Plasmaforschung, Universitõt Stuttgart, Stuttgart (DE);MESKAT J, Institut f³r Plasmaforschung, Universitõt Stuttgart, Stuttgart (DE);GIRUZZI G, CEA Cadarache, EURATOM Association, Saint-Paul-Lez-Durance (FR);GNTER S, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE);LEUTERER F, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE);MARASCHEK M, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE);YU Q, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE);ASDEX UPGRADE TEAM, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE);ECRH-GROUP, MPI f³r Plasmaphysik, EURATOM Association, Garching (DE)
Bibliographic Reference: Article: Physical Review Letters, Vol. 85 (2000) No. 6, pp. 1242-1245
Availability: Physical Review Letters (Journal)
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