Physics of Plasmas · 2012 · 37 citations · 29 references
Natural SciencesNuclear EngineeringPhysicsFusion EngineeringNuclear PhysicsPlasma PhysicsAccelerator PhysicsFusion PlasmasHeavy-ion PhysicsHigh-temperature PlasmasNuclear FusionPlasma HeatingAlfven WavesAlfvén WavesBeam-driven InstabilitiesEdge Plasma DiagnosticsEdge Plasma InteractionsIon Beam FusionIon Cyclotron Resonance HeatingSawtooth Oscillations
Experiments on accelerating NBI-produced deuterium (D) beam ions from their injection energy of ∼110 keV up to the MeV energy range with 3rd harmonic ion cyclotron resonance heating were performed on the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)]. A renewed set of nuclear diagnostics was used for analysing fast D ions during sawtooth stabilization, monster sawtooth crashes, and during excitation of Alfvén eigenmodes (AEs) residing inside the q = 1 radius. The measurements and modeling of the fast ions with the nonlinear HAGIS code [S. D. Pinches et al., Comput. Phys. Commun. 111, 133 (1998)] show that monster sawtooth crashes are strongly facilitated by the AE-induced re-distribution of the fast D ions from inside the q = 1 radius to the plasma edge.
29