Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes
Abstract
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.
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1537272
- Alternate Identifier(s):
- OSTI ID: 1425244
- Grant/Contract Number:
- FG02-08ER54954; AC02-05CH11231; FC02-08ER54987; FG02-08ER54987
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics
Citation Formats
Chen, Y., Fu, G. Y., Collins, C., Taimourzadeh, S., and Parker, S. E. Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes. United States: N. p., 2018.
Web. doi:10.1063/1.5019724.
Chen, Y., Fu, G. Y., Collins, C., Taimourzadeh, S., & Parker, S. E. Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes. United States. https://doi.org/10.1063/1.5019724
Chen, Y., Fu, G. Y., Collins, C., Taimourzadeh, S., and Parker, S. E. Fri .
"Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes". United States. https://doi.org/10.1063/1.5019724. https://www.osti.gov/servlets/purl/1537272.
@article{osti_1537272,
title = {Zonal structure effect on the nonlinear saturation of reverse shear Alfven eigenmodes},
author = {Chen, Y. and Fu, G. Y. and Collins, C. and Taimourzadeh, S. and Parker, S. E.},
abstractNote = {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.},
doi = {10.1063/1.5019724},
journal = {Physics of Plasmas},
number = 3,
volume = 25,
place = {United States},
year = {Fri Mar 09 00:00:00 EST 2018},
month = {Fri Mar 09 00:00:00 EST 2018}
}
Web of Science
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Works referencing / citing this record:
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