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The onset of a neoclassical tearing mode (NTM) depends on the existence of a large enough seed island. It is shown in the Joint European Torus that NTMs can be readily destabilised by long period sawteeth, such as obtained by sawtooth stabilisation from ion cyclotron heating or current drive. This has important implications for burning plasma scenarios, as alpha particles strongly stabilise the sawteeth. It is also shown that by adding heating and current drive just outside the inversion radius, sawteeth are destabilised, resulting in shorter sawtooth periods and larger beta values being obtained without NTMs being destabilised.

A shorter version of this report was published in Physical Review Letters, Vol 88, no. 10 (2002) pp. 105001/1-4. It can be accessed online by subscribers at:

Additional information

Authors: SAUTER O, Centre de Recherches en Physique des Plasmas, EPFL, Lausanne (CH);WESTERHOF E, FOM-Rijnhuizen, Nieuwwegein (NL);MAYORAL M L ET AL, EURATOM/UKAEA Fusion Association, Abingdon (GB);NGUYEN F, DRFC, CEA Cadarache (FR);PECQUET A L, DRFC, CEA Cadarache (FR);BELO P A, Centro de Fusio Nuclear, Lisboa (PT);NAVE M F F, Centro de Fusio Nuclear, Lisboa (PT);HELLSTEN T, Association EURATOM-NFR, Stockholm (SV);JOHNSON T, Association EURATOM-NFR, Stockholm (SV);LAMALLE P, LPP / ERM-KMS, Brussels (BE);MANTSINEN J, Helsinki University of Technology (FI);PINCHES S D, Max-Planck-IPP, Garching (DE);PODDA S, CRF, Association EURATOM- ENEA, Frascati (IT);RAPP J, Institut fur Plasmaphysik, Julich (DE)
Bibliographic Reference: Internal report LRP 718/02, January 2002. pp.11.
Availability: Available free of charge from: Ecole polytechnique federale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
ISBN: ISSN: 0458-5895
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