Three-wave interactions between fast-ion modes in the National Spherical Torus Experiment.
Simultaneous bursts of energetic particle mode (EPM) and toroidicity-induced Alfvén 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.
Crocker
N A
NA
University of California, Los Angeles, California 90095-7099, USA.
Peebles
W A
WA
Kubota
S
S
Fredrickson
E D
ED
Kaye
S M
SM
LeBlanc
B P
BP
Menard
J E
JE