title: Destabilization of fast-ion-induced long sawteeth by localized current drive in the JET tokamak.
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 [Phys. Rev. Lett. 88, 105001 (2002)]]. 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.
authors.affiliation: Association EURATOM-CEA, CEA/DSM/DRFC, CEA-Cadarache, F-13108 St. Paul lez Durance, France.
authors.forename: L-G
authors.initials: LG
authors.lastname: Eriksson
authors.forename: A
authors.initials: A
authors.lastname: Mueck
authors.forename: O
authors.initials: O
authors.lastname: Sauter
authors.forename: S
authors.initials: S
authors.lastname: Coda
authors.forename: M J
authors.initials: MJ
authors.lastname: Mantsinen
authors.forename: M-L
authors.initials: ML
authors.lastname: Mayoral
authors.forename: E
authors.initials: E
authors.lastname: Westerhof
authors.forename: R J
authors.initials: RJ
authors.lastname: Buttery
authors.forename: D
authors.initials: D
authors.lastname: McDonald
authors.forename: T
authors.initials: T
authors.lastname: Johnson
authors.forename: J-M
authors.initials: JM
authors.lastname: Noterdaeme
authors.forename: P
authors.initials: P
authors.lastname: De Vries