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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. doi: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. doi: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 = {2018},
month = {5}
}

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

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Works referenced in this record:

Understanding and predicting profile structure and parametric scaling of intrinsic rotation
journal, September 2017

  • Wang, W. X.; Grierson, B. A.; Ethier, S.
  • Physics of Plasmas, Vol. 24, Issue 9
  • DOI: 10.1063/1.4997789

How does drift wave turbulence convert parallel compression into perpendicular flows?
journal, August 2012


Experimental observations of driven and intrinsic rotation in tokamak plasmas
journal, July 2016


Another look at zonal flows: Resonance, shearing, and frictionless saturation
journal, April 2018

  • Li, J. C.; Diamond, P. H.
  • Physics of Plasmas, Vol. 25, Issue 4
  • DOI: 10.1063/1.5027107

Intrinsic rotation and electric field shear
journal, April 2007

  • Gürcan, Ö. D.; Diamond, P. H.; Hahm, T. S.
  • Physics of Plasmas, Vol. 14, Issue 4
  • DOI: 10.1063/1.2717891

Observation of Turbulent-Driven Shear Flow in a Cylindrical Laboratory Plasma Device
journal, May 2006


Intrinsic rotation in DIII-D
journal, May 2007

  • deGrassie, J. S.; Rice, J. E.; Burrell, K. H.
  • Physics of Plasmas, Vol. 14, Issue 5
  • DOI: 10.1063/1.2539055

On the transition to drift turbulence in a magnetized plasma column
journal, May 2005

  • Burin, M. J.; Tynan, G. R.; Antar, G. Y.
  • Physics of Plasmas, Vol. 12, Issue 5
  • DOI: 10.1063/1.1889443

Dynamics of intrinsic axial flows in unsheared, uniform magnetic fields
journal, May 2016

  • Li, J. C.; Diamond, P. H.; Xu, X. Q.
  • Physics of Plasmas, Vol. 23, Issue 5
  • DOI: 10.1063/1.4950830

Validation study of a drift-wave turbulence model for CSDX linear plasma device
journal, September 2017

  • Vaezi, P.; Holland, C.; Thakur, S. C.
  • Physics of Plasmas, Vol. 24, Issue 9
  • DOI: 10.1063/1.4995305

Residual parallel Reynolds stress due to turbulence intensity gradient in tokamak plasmas
journal, November 2010

  • Gürcan, Ö. D.; Diamond, P. H.; Hennequin, P.
  • Physics of Plasmas, Vol. 17, Issue 11
  • DOI: 10.1063/1.3503624

Ion Collection by Oblique Surfaces of an Object in a Transversely Flowing Strongly Magnetized Plasma
journal, July 2008


Edge Temperature Gradient as Intrinsic Rotation Drive in Alcator C -Mod Tokamak Plasmas
journal, May 2011


A Key to Improved Ion Core Confinement in the JET Tokamak: Ion Stiffness Mitigation due to Combined Plasma Rotation and Low Magnetic Shear
journal, September 2011


Kinetic solution to the Mach probe problem in transversely flowing strongly magnetized plasmas
journal, September 2009


An overview of intrinsic torque and momentum transport bifurcations in toroidal plasmas
journal, September 2013


The ecology of flows and drift wave turbulence in CSDX: A model
journal, February 2018

  • Hajjar, R. J.; Diamond, P. H.; Tynan, G. R.
  • Physics of Plasmas, Vol. 25, Issue 2
  • DOI: 10.1063/1.5018320

Intrinsic Rotation from a Residual Stress at the Boundary of a Cylindrical Laboratory Plasma
journal, February 2010


Rotation and momentum transport in tokamaks and helical systems
journal, March 2014


Multi-instability plasma dynamics during the route to fully developed turbulence in a helicon plasma
journal, July 2014


Momentum confinement at low torque
journal, November 2007

  • Solomon, W. M.; Burrell, K. H.; deGrassie, J. S.
  • Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B
  • DOI: 10.1088/0741-3335/49/12B/S29

Overestimation of Mach number due to probe shadow
journal, July 2016

  • Gosselin, J. J.; Thakur, S. C.; Sears, S. H.
  • Physics of Plasmas, Vol. 23, Issue 7
  • DOI: 10.1063/1.4954820

Structure formation in parallel ion flow and density profiles by cross-ferroic turbulent transport in linear magnetized plasma
journal, October 2016

  • Kobayashi, T.; Inagaki, S.; Kosuga, Y.
  • Physics of Plasmas, Vol. 23, Issue 10
  • DOI: 10.1063/1.4965915

Zonal flows in plasma—a review
journal, April 2005


On the efficiency of intrinsic rotation generation in tokamaks
journal, October 2010

  • Kosuga, Y.; Diamond, P. H.; Gürcan, Ö. D.
  • Physics of Plasmas, Vol. 17, Issue 10
  • DOI: 10.1063/1.3496055

Modelling enhanced confinement in drift-wave turbulence
journal, June 2017

  • Hajjar, R. J.; Diamond, P. H.; Ashourvan, A.
  • Physics of Plasmas, Vol. 24, Issue 6
  • DOI: 10.1063/1.4985323

Inter-machine comparison of intrinsic toroidal rotation in tokamaks
journal, October 2007


Role of Turbulence on Edge Momentum Redistribution in the TJ-II Stellarator
journal, April 2006


Sustained Stabilization of the Resistive-Wall Mode by Plasma Rotation in the DIII-D Tokamak
journal, November 2002


A Concept of Cross-Ferroic Plasma Turbulence
journal, February 2016

  • Inagaki, S.; Kobayashi, T.; Kosuga, Y.
  • Scientific Reports, Vol. 6, Issue 1
  • DOI: 10.1038/srep22189