Dynamics of intrinsic axial flows in unsheared, uniform magnetic fields

Li, J. C.; Diamond, P. H.; Xu, X. Q.; Tynan, G. R.

doi:10.1063/1.4950830

Title: Dynamics of intrinsic axial flows in unsheared, uniform magnetic fields

Journal Article · Fri May 27 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4950830· OSTI ID:1873624

^[1]; Diamond, P. H. ^[1];

^[2]; Tynan, G. R. ^[1]

University of California, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A simple model for the generation and amplification of intrinsic axial flow in a linear device, controlled shear decorrelation experiment, is proposed. This model proposes and builds upon a novel dynamical symmetry breaking mechanism, using a simple theory of drift wave turbulence in the presence of axial flow shear. This mechanism does not require complex magnetic field structure, such as shear, and thus is also applicable to intrinsic rotation generation in tokamaks at weak or zero magnetic shear, as well as to linear devices. This mechanism is essentially the self-amplification of the mean axial flow profile, i.e., a modulational instability. Hence, the flow development is a form of negative viscosity phenomenon. Unlike conventional mechanisms where the residual stress produces an intrinsic torque, in this dynamical symmetry breaking scheme, the residual stress induces a negative increment to the ambient turbulent viscosity. The axial flow shear is then amplified by this negative viscosity increment. The resulting mean axial flow profile is calculated and discussed by analogy with the problem of turbulent pipe flow. For tokamaks, the negative viscosity is not needed to generate intrinsic rotation. However, toroidal rotation profile gradient is enhanced by the negative increment in turbulent viscosity.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344; FG02-04ER54738; SC0008378

OSTI ID:: 1873624

Alternate ID(s):: OSTI ID: 1254757

Report Number(s):: LLNL-JRNL-736526; 889353; TRN: US2307055

Journal Information:: Physics of Plasmas, Vol. 23, 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: 13 works

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References (28)

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Cited By (7)

Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment Hong, R.; Li, J. C.; Thakur, R. Hajjar. Chakraborty arXiv https://doi.org/10.48550/arxiv.1805.03705	text	January 2018
CHNS: A case study of turbulence in elastic media Fan, Xiang; Diamond, P. H.; Chacón, L. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5016075	journal	May 2018
Simultaneous measurements of turbulent Reynolds stresses and particle flux in both parallel and perpendicular directions in a linear magnetized plasma device Chakraborty Thakur, Saikat; Hong, Rongjie; Tynan, George R. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039433	journal	October 2018
Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak Long, T.; Diamond, P. H.; Xu, M. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab33cf	journal	August 2019
Dynamics of zonal shear collapse with hydrodynamic electrons Hajjar, R. J.; Diamond, P. H.; Malkov, M. A. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5030345	journal	June 2018
How shear increments affect the flow production branching ratio in CSDX Li, J. C.; Diamond, P. H. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5033911	journal	June 2018
Avalanches triggered by Kelvin-Helmholtz instability in a cylindrical plasma device Lang, Y.; Guo, Z. B.; Wang, X. G. Physical Review E, Vol. 100, Issue 3 https://doi.org/10.1103/physreve.100.033212	journal	September 2019

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