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Abstract

In a tokamak fusion reactor the energetic alpha particles will transiently stabilize the magnetohydrodynamic activity causing sawtooth oscillations. The crash events terminating long sawtooth free periods can provide seed islands for neoclassical tearing modes. To shorten the sawtooth periods localized current drive near the q = 1 surface is a possibility. This Letter provides the first experimental evidence for the effectiveness of this method in the different physics regime associated with fast-ion-induced long sawteeth on the JET tokamak.

Additional information

Authors: ERIKSSON L-G, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MUECK A, Max-Planck-Institut fur Plasmaphysik, IPP-EURATOM Association, Garching (DE);NOTERDAEME J-M, Max-Planck-Institut fur Plasmaphysik, IPP-EURATOM Association, Garching (DE);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);CODA S, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);MANTSINEN M J, Association EURATOM-TEKES, Helsinki University of Technology (FI);MAYORAL M-L, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);BUTTERY R J, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);MCDONALD D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);DEVRIES P, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);WESTERHOF E, FOM-Rijnhuisen, Association EURATOM-FOM, Nieuwegein (NL);JOHNSON T, Euratom-VR Association, Stockholm (SE)
Bibliographic Reference: An article published in: Physical Review Letters, Volume 92, Number 23, Week ending 11 June 2004
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://prl.aps.org/
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