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Title: Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1290304
Grant/Contract Number:
FG02-04ER54738; 2013GB112002
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 10; Related Information: CHORUS Timestamp: 2016-08-12 03:20:23; Journal ID: ISSN 0029-5515
Publisher:
IOP Publishing
Country of Publication:
IAEA
Language:
English

Citation Formats

Wang, Lu, Wen, Tiliang, and Diamond, P. H.. Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence. IAEA: N. p., 2016. Web. doi:10.1088/0029-5515/56/10/106017.
Wang, Lu, Wen, Tiliang, & Diamond, P. H.. Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence. IAEA. doi:10.1088/0029-5515/56/10/106017.
Wang, Lu, Wen, Tiliang, and Diamond, P. H.. 2016. "Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence". IAEA. doi:10.1088/0029-5515/56/10/106017.
@article{osti_1290304,
title = {Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence},
author = {Wang, Lu and Wen, Tiliang and Diamond, P. H.},
abstractNote = {},
doi = {10.1088/0029-5515/56/10/106017},
journal = {Nuclear Fusion},
number = 10,
volume = 56,
place = {IAEA},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/0029-5515/56/10/106017

Citation Metrics:
Cited by: 1work
Citation information provided by
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  • Cited by 3
  • Most existing theoretical studies of momentum transport focus on calculating the Reynolds stress based on quasilinear theory, without considering the nonlinear momentum flux-〈v{sup ~}{sub r}n{sup ~}u{sup ~}{sub ∥}〉. However, a recent experiment on TORPEX found that the nonlinear toroidal momentum flux induced by blobs makes a significant contribution as compared to the Reynolds stress [Labit et al., Phys. Plasmas 18, 032308 (2011)]. In this work, the nonlinear parallel momentum flux in strong electrostatic turbulence is calculated by using a three dimensional Hasegawa-Mima equation, which is relevant for tokamak edge turbulence. It is shown that the nonlinear diffusivity is smaller thanmore » the quasilinear diffusivity from Reynolds stress. However, the leading order nonlinear residual stress can be comparable to the quasilinear residual stress, and so may be important to intrinsic rotation in tokamak edge plasmas. A key difference from the quasilinear residual stress is that parallel fluctuation spectrum asymmetry is not required for nonlinear residual stress.« less
  • A significant inward flux of toroidal momentum is found in global gyrokinetic simulations of ion temperature gradient turbulence, leading to core plasma rotation spin-up. The underlying mechanism is identified to be the generation of residual stress due to the k{sub parallel} symmetry breaking induced by global quasistationary zonal flow shear. Simulations also show a significant off-diagonal element associated with the ion temperature gradient in the neoclassical momentum flux, while the overall neoclassical flux is small. In addition, the residual turbulence found in the presence of strong ExB flow shear may account for neoclassical-level ion heat and anomalous momentum transport widelymore » observed in experiments.« less
  • An electromagnetic theory of turbulence driven poloidal rotation is developed with particular emphasis on understanding poloidal rotation in finite-{beta} plasmas. A relation linking the flux of polarization charge to the divergence of the total turbulent stress is derived for electromagnetic gyrokinetic modes. This relation is subsequently utilized to derive a constraint on the net electromagnetic turbulent stress exerted on the poloidal flow. Various limiting cases of this constraint are considered, where it is found that electromagnetic contributions to the turbulent stress may either enhance or reduce the net turbulent stress depending upon the branch of turbulence excited.