Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence

Wang, Lu; Wen, Tiliang; Diamond, P. H.

doi:10.1088/0029-5515/56/10/106017

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

Journal Article · Thu Aug 11 00:00:00 EDT 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/10/106017· OSTI ID:1290304

Wang, Lu; Wen, Tiliang; Diamond, P. H.

Abstract Virtually, all existing theoretical works on turbulent poloidal momentum transport are based on quasilinear theory. Nonlinear poloidal momentum flux— $〈 {\tilde{v}}_{r} \tilde{n} {\tilde{v}}_{θ} 〉$ 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 $〈 {\tilde{v}}_{r} \tilde{n} {\tilde{v}}_{θ} 〉$ 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.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER54738; 2013GB112002

OSTI ID:: 1290304

Alternate ID(s):: OSTI ID: 1290305; OSTI ID: 1429884

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 56 Journal Issue: 10; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Cited by: 8 works

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