Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes

Chen, Y.; Fu, G. Y.; Collins, C.; Taimourzadeh, S.; Parker, S. E.

doi:10.1063/1.5019724

Title: Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes

Journal Article · Fri Mar 09 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5019724· OSTI ID:1537272

Chen, Y. ^[1];

^[1]; Collins, C. ^[1]; Taimourzadeh, S. ^[1]; Parker, S. E. ^[1]

Univ. of Colorado, Boulder, CO (United States)

A gyrokinetic ion/fluid electron hybrid model is used to study the nonlinear evolution of reverse shear Alfven eigenmodes (RSAE) driven by energetic particles. When only the energetic particle nonlinear effects are included, the saturation amplitude of a single-n RSAE follows the trapping scaling, δB/B~(γ/ω)². When the nonlinear effects of thermal ions and electrons are included, zonal structures are force generated but do not affect the saturation amplitude for γ/ω≤0.03. No spontaneous generation of zonal structures is observed, in contrast to ion-temperature-gradient-driven modes. At larger energetic particle drive, the effects of zonal structures cause a significant reduction in the RSAE saturation amplitude. The reduction is not caused by the zonal flow shearing of the RSAE, but by the force-generated n = 0 component in the thermal ion distribution function and the electron density. Finally, these n = 0 perturbations lead to nonlinear evolution of the RSAE mode structure and enhance damping.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER54954; AC02-05CH11231; FC02-08ER54987; FG02-08ER54987

OSTI ID:: 1537272

Alternate ID(s):: OSTI ID: 1425244

Journal Information:: Physics of Plasmas, Vol. 25, Issue 3; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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