Three-wave interactions between fast-ion modes in the national spherical torus experiment

N. A. Crocker; W. A. Peebles; S. Kubota; E. D. Fredrickson; S. M. Kaye; B. P. Leblanc; J. E. Menard

doi:10.1103/PhysRevLett.97.045002

Three-wave interactions between fast-ion modes in the national spherical torus experiment

N. A. Crocker, W. A. Peebles, S. Kubota, E. D. Fredrickson, S. M. Kaye, B. P. Leblanc, J. E. Menard

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Abstract

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.

Original language	English (US)
Article number	045002
Journal	Physical review letters
Volume	97
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.97.045002
State	Published - 2006

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.97.045002

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title = "Three-wave interactions between fast-ion modes in the national spherical torus experiment",

abstract = "Simultaneous bursts of energetic particle mode (EPM) and toroidicity-induced Alfv{\'e}n 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.",

author = "Crocker, \{N. A.\} and Peebles, \{W. A.\} and S. Kubota and Fredrickson, \{E. D.\} and Kaye, \{S. M.\} and Leblanc, \{B. P.\} and Menard, \{J. E.\}",

year = "2006",

doi = "10.1103/PhysRevLett.97.045002",

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T1 - Three-wave interactions between fast-ion modes in the national spherical torus experiment

AU - Crocker, N. A.

AU - Peebles, W. A.

AU - Kubota, S.

AU - Fredrickson, E. D.

AU - Kaye, S. M.

AU - Leblanc, B. P.

AU - Menard, J. E.

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

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VL - 97

JO - Physical review letters

JF - Physical review letters

IS - 4

M1 - 045002

ER -

Three-wave interactions between fast-ion modes in the national spherical torus experiment

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All Science Journal Classification (ASJC) codes

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