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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [3]; ORCiD logo [4]
  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
  2. Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, California 92093, USA
  3. 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)
  4. Univ. of California, San Diego, CA (United States). Center for Energy Research; Southwestern Inst. of Physics, Chengdu, Sichuan (China)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1524571
Alternate Identifier(s):
OSTI ID: 1436554
Grant/Contract Number:  
FG02-04ER54738; FG02-07ER54912
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hong, R., Li, J. C., Hajjar, R., Chakraborty Thakur, S., Diamond, P. H., and Tynan, G. R.. Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment. United States: N. p., 2018. Web. doi:10.1063/1.5017884.
Hong, R., Li, J. C., Hajjar, R., Chakraborty Thakur, S., Diamond, P. H., & Tynan, G. R.. Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment. United States. https://doi.org/10.1063/1.5017884
Hong, R., Li, J. C., Hajjar, R., Chakraborty Thakur, S., Diamond, P. H., and Tynan, G. R.. Wed . "Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment". United States. https://doi.org/10.1063/1.5017884. https://www.osti.gov/servlets/purl/1524571.
@article{osti_1524571,
title = {Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment},
author = {Hong, R. and Li, J. C. and Hajjar, R. and Chakraborty Thakur, S. and Diamond, P. H. and Tynan, G. R.},
abstractNote = {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.},
doi = {10.1063/1.5017884},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Wed May 09 00:00:00 EDT 2018},
month = {Wed May 09 00:00:00 EDT 2018}
}

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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: Schematic of CSDX with probe and fast imaging diagnostics.

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Works referenced in this record:

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Works referencing / citing this record:

How shear increments affect the flow production branching ratio in CSDX
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Simultaneous measurements of turbulent Reynolds stresses and particle flux in both parallel and perpendicular directions in a linear magnetized plasma device
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