Reimerdes, H.Sauter, O.Goodman, T.Pochelon, A.2008-04-162008-04-162008-04-16200210.1103/PhysRevLett.88.105005https://infoscience.epfl.ch/handle/20.500.14299/21823WOS:000174342000037In 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.text::journal::journal article::research article