title: Sawtooth-control mechanism using toroidally propagating ion-cyclotron-resonance waves in tokamaks.
abstract: The sawtooth control mechanism in plasmas employing off-axis toroidally propagating ion cyclotron resonance waves in tokamaks is reinvestigated. The radial drift excursion of energetic passing ions distributed asymmetrically in the velocity parallel to the magnetic field determines stability when the rational q=1 surface resides within a narrow region centered about the shifted fundamental cyclotron resonance.
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, 1015 Lausanne, Switzerland.
authors.forename: J P
authors.initials: JP
authors.lastname: Graves
authors.forename: I
authors.initials: I
authors.lastname: Chapman
authors.forename: S
authors.initials: S
authors.lastname: Coda
authors.forename: L-G
authors.initials: LG
authors.lastname: Eriksson
authors.forename: T
authors.initials: T
authors.lastname: Johnson