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Title: Nonlinear flow generation by electrostatic turbulence in tokamaks

Abstract

Global gyrokinetic simulations have revealed an important nonlinear flow generation process due to the residual stress produced by electrostatic turbulence of ion temperature gradient (ITG) modes and trapped electron modes (TEMs). In collisionless TEM (CTEM) turbulence, nonlinear residual stress generation by both the fluctuation intensity and the intensity gradient in the presence of broken symmetry in the parallel wavenumber spectrum is identified for the first time. Concerning the origin of the symmetry breaking, turbulence self-generated low frequency zonal flow shear has been identified to be a key, universal mechanism in various turbulence regimes. Simulations reported here also indicate the existence of other mechanisms beyond E × B shear. The ITG turbulence driven “intrinsic” torque associated with residual stress is shown to increase close to linearly with the ion temperature gradient, in qualitative agreement with experimental observations in various devices. In CTEM dominated regimes, a net toroidal rotation is driven in the cocurrent direction by intrinsic torque, consistent with the experimental trend of observed intrinsic rotation. The finding of a “flow pinch” in CTEM turbulence may offer an interesting new insight into the underlying dynamics governing the radial penetration of modulated flows in perturbation experiments. Lastly, simulations also reveal highly distinctmore » phase space structures between CTEM and ITG turbulence driven momentum, energy, and particle fluxes, elucidating the roles of resonant and non-resonant particles.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [1]
  1. Princeton Univ., Princeton, NJ (United States). Physics of Plasmas
  2. Univ. of California, San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1564696
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 17; Journal Issue: 7; 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

Wang, W. X., Diamond, P. H., Hahm, T. S., Ethier, S., Rewoldt, G., and Tang, W. M. Nonlinear flow generation by electrostatic turbulence in tokamaks. United States: N. p., 2010. Web. doi:10.1063/1.3459096.
Wang, W. X., Diamond, P. H., Hahm, T. S., Ethier, S., Rewoldt, G., & Tang, W. M. Nonlinear flow generation by electrostatic turbulence in tokamaks. United States. doi:10.1063/1.3459096.
Wang, W. X., Diamond, P. H., Hahm, T. S., Ethier, S., Rewoldt, G., and Tang, W. M. Thu . "Nonlinear flow generation by electrostatic turbulence in tokamaks". United States. doi:10.1063/1.3459096. https://www.osti.gov/servlets/purl/1564696.
@article{osti_1564696,
title = {Nonlinear flow generation by electrostatic turbulence in tokamaks},
author = {Wang, W. X. and Diamond, P. H. and Hahm, T. S. and Ethier, S. and Rewoldt, G. and Tang, W. M.},
abstractNote = {Global gyrokinetic simulations have revealed an important nonlinear flow generation process due to the residual stress produced by electrostatic turbulence of ion temperature gradient (ITG) modes and trapped electron modes (TEMs). In collisionless TEM (CTEM) turbulence, nonlinear residual stress generation by both the fluctuation intensity and the intensity gradient in the presence of broken symmetry in the parallel wavenumber spectrum is identified for the first time. Concerning the origin of the symmetry breaking, turbulence self-generated low frequency zonal flow shear has been identified to be a key, universal mechanism in various turbulence regimes. Simulations reported here also indicate the existence of other mechanisms beyond E × B shear. The ITG turbulence driven “intrinsic” torque associated with residual stress is shown to increase close to linearly with the ion temperature gradient, in qualitative agreement with experimental observations in various devices. In CTEM dominated regimes, a net toroidal rotation is driven in the cocurrent direction by intrinsic torque, consistent with the experimental trend of observed intrinsic rotation. The finding of a “flow pinch” in CTEM turbulence may offer an interesting new insight into the underlying dynamics governing the radial penetration of modulated flows in perturbation experiments. Lastly, simulations also reveal highly distinct phase space structures between CTEM and ITG turbulence driven momentum, energy, and particle fluxes, elucidating the roles of resonant and non-resonant particles.},
doi = {10.1063/1.3459096},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 17,
place = {United States},
year = {2010},
month = {7}
}

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