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Abstract

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.

Another version of this paper was published as an http://icadc.cordis.lu/fep-cgi/srchidadb?ACTION=D&SESSION=&RCN=200114212&CALLER=PUBL_LIB (EPFL Internal Report).

Additional information

Authors: REIMERDES H, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);GOODMAN T, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);POCHELON A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: An article published in: Physical Review Letters, 88 (10), 105005 (2002) This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://link.aps.org/abstract/PRL/v88/e105005
Availability: Printed copies available from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne (CH) Fax +41-21-6934747
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