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.
- 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}
}
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Works referenced in this record:
Nonlinear gyrokinetic equations for low-frequency electromagnetic waves in general plasma equilibria
journal, January 1982
- Frieman, E. A.
- Physics of Fluids, Vol. 25, Issue 3
Physics of Alfvén waves and energetic particles in burning plasmas
journal, March 2016
- Chen, Liu; Zonca, Fulvio
- Reviews of Modern Physics, Vol. 88, Issue 1
Nonlinear response of driven systems in weak turbulence theory
journal, May 1996
- Berk, H. L.; Breizman, B. N.; Fitzpatrick, J.
- Physics of Plasmas, Vol. 3, Issue 5
Nonlinear Hybrid Simulation of the Toroidicity-Induced Alfvén Eigenmode
journal, February 1995
- Fu, G. Y.; Park, W.
- Physical Review Letters, Vol. 74, Issue 9
Nonlinear evolution of the toroidal Alfvén instability using a gyrofluid model*
journal, May 1994
- Spong, D. A.; Carreras, B. A.; Hedrick, C. L.
- Physics of Plasmas, Vol. 1, Issue 5
Theory of energetic alpha‐particle‐driven Alfvén wave turbulence
journal, October 1992
- Gang, Fongyan
- Physics of Fluids B: Plasma Physics, Vol. 4, Issue 10
Benchmarking gyrokinetic simulations in a toroidal flux-tube
journal, September 2013
- Chen, Y.; Parker, S. E.; Wan, W.
- Physics of Plasmas, Vol. 20, Issue 9
Nonlinear dynamics of Alfvén eigenmodes in toroidal plasmas
journal, November 1998
- Chen, L.; Zonca, F.; Santoro, R. A.
- Plasma Physics and Controlled Fusion, Vol. 40, Issue 11
Numerical study of the nonlinear evolution of toroidicity-induced Alfvén eigenmodes
journal, January 1999
- Chen, Yang; White, Roscoe B.; Fu, Guo-yong
- Physics of Plasmas, Vol. 6, Issue 1
Nonlinear magnetohydrodynamic effects on Alfvén eigenmode evolution and zonal flow generation
journal, July 2010
- Todo, Y.; Berk, H. L.; Breizman, B. N.
- Nuclear Fusion, Vol. 50, Issue 8
Observation of Critical-Gradient Behavior in Alfvén-Eigenmode-Induced Fast-Ion Transport
journal, February 2016
- Collins, C. S.; Heidbrink, W. W.; Austin, M. E.
- Physical Review Letters, Vol. 116, Issue 9
Saturation of Alfvén modes in tokamaks
journal, September 2016
- White, Roscoe; Gorelenkov, Nikolai; Gorelenkova, Marina
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 11
A Landau fluid model for electromagnetic plasma microturbulence
journal, July 2001
- Snyder, P. B.; Hammett, G. W.
- Physics of Plasmas, Vol. 8, Issue 7
Electromagnetic gyrokinetic δf particle-in-cell turbulence simulation with realistic equilibrium profiles and geometry
journal, January 2007
- Chen, Yang; Parker, Scott E.
- Journal of Computational Physics, Vol. 220, Issue 2
Nonlinear Saturation of Toroidal Alfvén Eigenmodes via Ion Compton Scattering
journal, January 1995
- Hahm, T. S.; Chen, Liu
- Physical Review Letters, Vol. 74, Issue 2
Long-Term Landau-Fluid Simulation of Alfvén Eigenmode Instabilities
journal, January 2014
- Spong, Donald A.
- Plasma and Fusion Research, Vol. 9, Issue 0
Poloidal Flow Driven by Ion-Temperature-Gradient Turbulence in Tokamaks
journal, January 1998
- Rosenbluth, M. N.; Hinton, F. L.
- Physical Review Letters, Vol. 80, Issue 4
Gyrokinetic simulations of reverse shear Alfvén eigenmodes in DIII-D plasmas
journal, January 2013
- Chen, Y.; Munsat, T.; Parker, S. E.
- Physics of Plasmas, Vol. 20, Issue 1
Theory and simulation of rotational shear stabilization of turbulence
journal, May 1998
- Waltz, R. E.; Dewar, R. L.; Garbet, X.
- Physics of Plasmas, Vol. 5, Issue 5
Self‐consistent study of the alpha‐particle‐driven toroidicity‐induced Alfvén eigenmode
journal, August 1994
- Wu, Yanlin; White, Roscoe B.
- Physics of Plasmas, Vol. 1, Issue 8
A gyrokinetic ion zero electron inertia fluid electron model for turbulence simulations
journal, February 2001
- Chen, Yang; Parker, Scott
- Physics of Plasmas, Vol. 8, Issue 2
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journal, April 2019
- Zou, Yunpeng; Chan, Vincent S.; Huang, Juan
- Nuclear Fusion, Vol. 59, Issue 6
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journal, October 2019
- Ren, Zhen-Zhen; Chen, Yang; Fu, G. Y.
- Nuclear Fusion, Vol. 60, Issue 1