Three-Wave Interactions between Fast-Ion Modes in the National Spherical Torus Experiment

Journal Article · Fri Jul 28 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.045002· OSTI ID:20860575

Crocker, N A; Peebles, W A; Kubota, S; Fredrickson, E D; Kaye, S M; LeBlanc, B P; Menard, J E ^[1]

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1. University of California, Los Angeles, California 90095-7099 (United States)

Simultaneous bursts of energetic particle mode (EPM) and toroidicity-induced Alfven eigenmode (TAE) activity that correlate with significant fast-ion loss are observed in beam heated plasmas. Three-wave interactions between these modes are conclusively identified, indicating fixed phase relationships. This nonlinear coupling concentrates the energy of the TAEs into a toroidally localized perturbation frozen in the frame of a rigid, toroidally rotating structure formed by the EPMs. This redistribution of energy is significant because it will modify the effect of the TAEs on fast-ion loss.

• OSTI ID: 20860575
• Journal Information: Physical Review Letters, Vol. 97, Issue 4; Other Information: DOI: 10.1103/PhysRevLett.97.045002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING
IONS
NONLINEAR PROBLEMS
PLASMA
SPHERICAL CONFIGURATION