Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment

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

doi:10.1063/1.5017884

Title: Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment

Journal Article · Wed May 09 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5017884· OSTI ID:1524571

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Univ. of California, San Diego, CA (United States). Center for Energy Research
Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, California 92093, USA
Univ. of California, San Diego, CA (United States). Center for Energy Research, and Center for Astrophysics and Space Sciences; Southwestern Inst. of Physics, Chengdu, Sichuan (China)
Univ. of California, San Diego, CA (United States). Center for Energy Research; Southwestern Inst. of Physics, Chengdu, Sichuan (China)

Detailed measurements of intrinsic axial flow generation parallel to the magnetic field in the controlled shear decorrelation experiment linear plasma device with no axial momentum input are presented and compared to theory. The results show a causal link from the density gradient to drift-wave turbulence with broken spectral symmetry and development of the axial mean parallel flow. As the density gradient steepens, the axial and azimuthal Reynolds stresses increase and radially sheared azimuthal and axial mean flows develop. A turbulent axial momentum balance analysis shows that the axial Reynolds stress drives the radially sheared axial mean flow. The turbulent drive (Reynolds power) for the azimuthal flow is an order of magnitude greater than that for axial flow, suggesting that the turbulence fluctuation levels are set by azimuthal flow shear regulation. The direct energy exchange between axial and azimuthal mean flows is shown to be insignificant. Therefore, the axial flow is parasitic to the turbulence-zonal flow system and is driven primarily by the axial turbulent stress generated by that system. The non-diffusive, residual part of the axial Reynolds stress is found to be proportional to the density gradient and is formed due to dynamical asymmetry in the drift-wave turbulence.

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

Sponsoring Organization:: USDOE

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

OSTI ID:: 1524571

Alternate ID(s):: OSTI ID: 1436554

Journal Information:: Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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