Tracing the Pathway from Drift-Wave Turbulence with Broken Symmetry to the Production of Sheared Axial Mean Flow

Hong, R.; Li, J.  C.; Chakraborty Thakur, S.; Hajjar, R.; Diamond, P.  H.; Tynan, G.  R.

doi:10.1103/physrevlett.120.205001

Title: Tracing the Pathway from Drift-Wave Turbulence with Broken Symmetry to the Production of Sheared Axial Mean Flow

Journal Article · Thu May 17 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.120.205001· OSTI ID:1541311

Hong, R. ^[1]; Li, J. C. ^[2]; Chakraborty Thakur, S. ^[1]; Hajjar, R. ^[1]; Diamond, P. H. ^[3]; Tynan, G. R. ^[4]

Univ. of California, San Diego, CA (United States). Center for Energy Research
Univ. of California, San Diego, CA (United States). Center for Astrophysics and Space Sciences
Univ. of California, San Diego, CA (United States). Center for Astrophysics and Space Sciences; Southwestern Inst. of Physics, Chengdu (China). Center for Fusion Science
Univ. of California, San Diego, CA (United States). Center for Energy Research; Southwestern Inst. of Physics, Chengdu (China). Center for Fusion Science

This study traces the emergence of sheared axial flow from collisional drift-wave turbulence with broken symmetry in a linear plasma device—the controlled shear decorrelation experiment. As the density profile steepens, the axial Reynolds stress develops and drives a radially sheared axial flow that is parallel to the magnetic field. Results show that the nondiffusive piece of the Reynolds stress is driven by the density gradient, results from spectral asymmetry of the turbulence, and, thus, is dynamical in origin. Taken together, these findings constitute the first simultaneous demonstration of the causal link between the density gradient, turbulence, and stress with broken spectral symmetry and the mean axial flow.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54738; FG02-07ER54912

OSTI ID:: 1541311

Alternate ID(s):: OSTI ID: 1437513

Journal Information:: Physical Review Letters, Vol. 120, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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