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

Abstract

Virtually, all existing theoretical works on turbulent poloidal momentum transport are based on quasilinear theory. Nonlinear poloidal momentum flux—$$\langle {{\tilde{v}}_{r}}\tilde{n}{{\tilde{v}}_{\theta}}\rangle $$ is universally neglected. However, in the strong turbulence regime where relative fluctuation amplitude is no longer small, quasilinear theory is invalid. This is true at the all-important plasma edge. In this work, nonlinear poloidal momentum flux $$\langle {{\tilde{v}}_{r}}\tilde{n}{{\tilde{v}}_{\theta}}\rangle $$ in strong electrostatic turbulence is calculated using the Hasegawa–Mima equation, and is compared with quasilinear poloidal Reynolds stress. A novel property is that symmetry breaking in fluctuation spectrum is not necessary for a nonlinear poloidal momentum flux. This is fundamentally different from the quasilinear Reynold stress. Furthermore, the comparison implies that the poloidal rotation drive from the radial gradient of nonlinear momentum flux is comparable to that from the quasilinear Reynolds force. Nonlinear poloidal momentum transport in strong electrostatic turbulence is thus not negligible for poloidal rotation drive, and so may be significant to transport barrier formation.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1290304
Alternate Identifier(s):
OSTI ID: 1290305; OSTI ID: 1429884
Grant/Contract Number:  
FG02-04ER54738; 2013GB112002
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Name: Nuclear Fusion Journal Volume: 56 Journal Issue: 10; Journal ID: ISSN 0029-5515
Publisher:
IOP Publishing
Country of Publication:
IAEA
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; poloidal rotation; nonlinear poloidal momentum flux; strong turbulence; Reynolds stress

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. https://doi.org/10.1088/0029-5515/56/10/106017
Wang, Lu, Wen, Tiliang, and Diamond, P. H. Thu . "Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence". IAEA. https://doi.org/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 = {Virtually, all existing theoretical works on turbulent poloidal momentum transport are based on quasilinear theory. Nonlinear poloidal momentum flux—$\langle {{\tilde{v}}_{r}}\tilde{n}{{\tilde{v}}_{\theta}}\rangle $ is universally neglected. However, in the strong turbulence regime where relative fluctuation amplitude is no longer small, quasilinear theory is invalid. This is true at the all-important plasma edge. In this work, nonlinear poloidal momentum flux $\langle {{\tilde{v}}_{r}}\tilde{n}{{\tilde{v}}_{\theta}}\rangle $ in strong electrostatic turbulence is calculated using the Hasegawa–Mima equation, and is compared with quasilinear poloidal Reynolds stress. A novel property is that symmetry breaking in fluctuation spectrum is not necessary for a nonlinear poloidal momentum flux. This is fundamentally different from the quasilinear Reynold stress. Furthermore, the comparison implies that the poloidal rotation drive from the radial gradient of nonlinear momentum flux is comparable to that from the quasilinear Reynolds force. Nonlinear poloidal momentum transport in strong electrostatic turbulence is thus not negligible for poloidal rotation drive, and so may be significant to transport barrier formation.},
doi = {10.1088/0029-5515/56/10/106017},
url = {https://www.osti.gov/biblio/1290304}, journal = {Nuclear Fusion},
issn = {0029-5515},
number = 10,
volume = 56,
place = {IAEA},
year = {2016},
month = {8}
}

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

Citation Metrics:
Cited by: 1 work
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