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research article
From current-driven to neoclassically driven tearing modes
In the TCV tokamak, the m/n = 2/1 island is observed in low-density discharges with central electron-cyclotron current drive. The evolution of its width has two distinct growth phases, one of which can be linked to a "conventional" tearing mode driven unstable by the current profile and the other to a neoclassical tearing mode driven by a perturbation of the bootstrap current. The TCV results provide the first clear observation of such a destabilization mechanism and reconcile the theory of conventional and neoclassical tearing modes, which differ only in the dominant driving term.
Type
research article
Web of Science ID
WOS:000174342000037
Authors
Publication date
2002
Published in
Volume
88
Issue
10
Article Number
105005
Peer reviewed
REVIEWED
Written at
EPFL
Available on Infoscience
April 16, 2008
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