Modelling enhanced confinement in drift-wave turbulence

Hajjar, R. J.; Diamond, P. H.; Ashourvan, A.; Tynan, G. R.

doi:10.1063/1.4985323

Title: Modelling enhanced confinement in drift-wave turbulence

Journal Article · Mon Jun 12 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4985323· OSTI ID:1474292

Hajjar, R. J. ^[1]; Diamond, P. H. ^[1]; Ashourvan, A. ^[1]; Tynan, G. R. ^[1]

Univ. of California, San Diego, La Jolla, CA (United States)

Here, the results of modeling studies of an enhanced confinement in the drift wave turbulent plasma of the CSDX linear device are presented. The mechanism of enhanced confinement is investigated here using a reduced 1D, time-dependent model, which illustrates the exchange of enstrophy between two disparate scale structures: the mesoscale flow and profile, and the turbulence intensity fields. Mean density, mean vorticity, and turbulent potential enstrophy are the variables for this model. Total potential enstrophy is conserved in this model. Vorticity mixing occurs on a scale length related to an effective Rhines' scale of turbulence, and shrinks as both density and vorticity gradients steepen. Numerical results obtained from solution of the model agree well with the experimental data from CSDX showing: (i) a steepening of the mean density profile, indicating a radial transport barrier formation, (ii) the development of a radially sheared azimuthal flow velocity that coincides with the density steepening and initiates a turbulence quench, and (iii) negative Reynolds work values, indicating that fluctuations drive the shear flow. These observations as the magnitude of the magnetic field B increases are recovered using purely diffusive expressions for the vorticity and density fluxes. A new dimensionless turbulence parameter R_DT-defined as the ratio of the integrated potential enstrophy transfer from turbulence to the flow, to the integrated potential enstrophy production due to relaxation of the density gradient is introduced as a turbulence collapse indicator that detects when the enhanced confinement state is triggered

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008378; FG02-04ER54738

OSTI ID:: 1474292

Alternate ID(s):: OSTI ID: 1363708

Journal Information:: Physics of Plasmas, Vol. 24, Issue 6; 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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References (44)

Evidence for Convective Inward Particle Transport in a Stellarator Stroth, U.; Geist, T.; Koponen, J. P. T. Physical Review Letters, Vol. 82, Issue 5 https://doi.org/10.1103/PhysRevLett.82.928	journal	February 1999
Momentum theorems and the structure of atmospheric jets and zonal flows in plasmas Diamond, P. H.; Gurcan, O. D.; Hahm, T. S. Plasma Physics and Controlled Fusion, Vol. 50, Issue 12 https://doi.org/10.1088/0741-3335/50/12/124018	journal	November 2008
Turbulent-driven low-frequency sheared E × B flows as the trigger for the H-mode transition Tynan, G. R.; Xu, M.; Diamond, P. H. Nuclear Fusion, Vol. 53, Issue 7 https://doi.org/10.1088/0029-5515/53/7/073053	journal	July 2013
Observation of turbulent-driven shear flow in a cylindrical laboratory plasma device Tynan, G. R.; Holland, C.; Yu, J. H. Plasma Physics and Controlled Fusion, Vol. 48, Issue 4 https://doi.org/10.1088/0741-3335/48/4/S05	journal	March 2006
The origin of convective structures in the scrape-off layer of linear magnetic fusion devices investigated by fast imaging Antar, G. Y.; Yu, J. H.; Tynan, G. Physics of Plasmas, Vol. 14, Issue 2 https://doi.org/10.1063/1.2424886	journal	February 2007
Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma Hahm, T. S.; Burrell, K. H. Physics of Plasmas, Vol. 2, Issue 5 https://doi.org/10.1063/1.871313	journal	May 1995
Spatio-temporal evolution of the L → I → H transition Miki, K.; Diamond, P. H.; Gürcan, Ö. D. Physics of Plasmas, Vol. 19, Issue 9 https://doi.org/10.1063/1.4753931	journal	September 2012
Resistive pressure‐gradient‐driven turbulence with self‐consistent flow profile evolution Carreras, B. A.; Lynch, V. E.; Garcia, L. Physics of Fluids B: Plasma Physics, Vol. 5, Issue 5 https://doi.org/10.1063/1.860889	journal	May 1993
Nonlinear energy transfer during the transition to drift-interchange turbulence Manz, P.; Xu, M.; Thakur, S. C. Plasma Physics and Controlled Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0741-3335/53/9/095001	journal	July 2011
Length scales of turbulence in stably stratified mixing layers Smyth, William D.; Moum, James N. Physics of Fluids, Vol. 12, Issue 6 https://doi.org/10.1063/1.870385	journal	June 2000
On the transition to drift turbulence in a magnetized plasma column Burin, M. J.; Tynan, G. R.; Antar, G. Y. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1889443	journal	May 2005
Dynamics of intrinsic axial flows in unsheared, uniform magnetic fields Li, J. C.; Diamond, P. H.; Xu, X. Q. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4950830	journal	May 2016
Plasma Edge Turbulence Hasegawa, Akira; Wakatani, Masahiro Physical Review Letters, Vol. 50, Issue 9 https://doi.org/10.1103/PhysRevLett.50.682	journal	February 1983
Linking the micro and macro: L-H transition dynamics and threshold physics Malkov, M. A.; Diamond, P. H.; Miki, K. Physics of Plasmas, Vol. 22, Issue 3 https://doi.org/10.1063/1.4914934	journal	March 2015
First Evidence of the Role of Zonal Flows for the $L − H$ Transition at Marginal Input Power in the EAST Tokamak Xu, G. S.; Wan, B. N.; Wang, H. Q. Physical Review Letters, Vol. 107, Issue 12 https://doi.org/10.1103/PhysRevLett.107.125001	journal	September 2011
Intrinsic rotation generation in ELM-free H-mode plasmas in the DIII-D tokamak—Experimental observations Müller, S. H.; Boedo, J. A.; Burrell, K. H. Physics of Plasmas, Vol. 18, Issue 7 https://doi.org/10.1063/1.3605041	journal	July 2011
Chaos and turbulence studies in low- plasmas Klinger, T.; Latten, A.; Piel, A. Plasma Physics and Controlled Fusion, Vol. 39, Issue 12B https://doi.org/10.1088/0741-3335/39/12B/012	journal	December 1997
Self-organization of electrostatic turbulence in a cylindrical plasma Hasegawa, Akira; Wakatani, Masahiro Physical Review Letters, Vol. 59, Issue 14 https://doi.org/10.1103/PhysRevLett.59.1581	journal	October 1987
Scaling properties of turbulence driven shear flow Yan, Z.; Tynan, G. R.; Holland, C. Physics of Plasmas, Vol. 17, Issue 1 https://doi.org/10.1063/1.3276521	journal	January 2010
Quiet periods in edge turbulence preceding the L-H transition in the National Spherical Torus Experiment Zweben, S. J.; Maqueda, R. J.; Hager, R. Physics of Plasmas, Vol. 17, Issue 10 https://doi.org/10.1063/1.3476276	journal	October 2010
Turbulent Equipartition and Homogenization of Plasma Angular Momentum Gürcan, Ö. D.; Diamond, P. H.; Hahm, T. S. Physical Review Letters, Vol. 100, Issue 13 https://doi.org/10.1103/PhysRevLett.100.135001	journal	April 2008
How mesoscopic staircases condense to macroscopic barriers in confined plasma turbulence Ashourvan, Arash; Diamond, P. H. Physical Review E, Vol. 94, Issue 5 https://doi.org/10.1103/PhysRevE.94.051202	journal	November 2016
Transport matrix for particles and momentum in collisional drift waves turbulence in linear plasma devices Ashourvan, Arash; Diamond, P. H.; Gürcan, Ö. D. Physics of Plasmas, Vol. 23, Issue 2 https://doi.org/10.1063/1.4942420	journal	February 2016
Turbulence in fusion plasmas: key issues and impact on transport modelling Garbet, X. Plasma Physics and Controlled Fusion, Vol. 43, Issue 12A https://doi.org/10.1088/0741-3335/43/12A/319	journal	November 2001
Dynamics of interfaces and layers in a stratified turbulent fluid Balmforth, N. J.; Llewellyn Smith, Stefan G.; Young, W. R. Journal of Fluid Mechanics, Vol. 355 https://doi.org/10.1017/S0022112097007970	journal	January 1998
Experimental observation of coupling between turbulence and sheared flows during L-H transitions in a toroidal plasma Estrada, T.; Happel, T.; Hidalgo, C. EPL (Europhysics Letters), Vol. 92, Issue 3 https://doi.org/10.1209/0295-5075/92/35001	journal	November 2010
Multi-instability plasma dynamics during the route to fully developed turbulence in a helicon plasma Thakur, S. C.; Brandt, C.; Cui, L. Plasma Sources Science and Technology, Vol. 23, Issue 4 https://doi.org/10.1088/0963-0252/23/4/044006	journal	July 2014
Drift waves and transport Horton, W. Reviews of Modern Physics, Vol. 71, Issue 3 https://doi.org/10.1103/RevModPhys.71.735	journal	April 1999
Verification and validation in computational fluid dynamics Oberkampf, William L.; Trucano, Timothy G. Progress in Aerospace Sciences, Vol. 38, Issue 3 https://doi.org/10.1016/S0376-0421(02)00005-2	journal	April 2002
Turbulent transport of fast ions in the Large Plasma Device Zhou, Shu; Heidbrink, W. W.; Boehmer, H. Physics of Plasmas, Vol. 17, Issue 9 https://doi.org/10.1063/1.3486532	journal	September 2010
Negative viscosity from negative compressibility and axial flow shear stiffness in a straight magnetic field Li, J. C.; Diamond, P. H. Physics of Plasmas, Vol. 24, Issue 3 https://doi.org/10.1063/1.4978956	journal	March 2017
Spontaneous profile self-organization in a simple realization of drift-wave turbulence Cui, L.; Ashourvan, A.; Thakur, S. C. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4944819	journal	March 2016
Validation metrics for turbulent plasma transport Holland, C. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4954151	journal	June 2016
Role of Zonal Flow Predator-Prey Oscillations in Triggering the Transition to H-Mode Confinement Schmitz, L.; Zeng, L.; Rhodes, T. L. Physical Review Letters, Vol. 108, Issue 15 https://doi.org/10.1103/PhysRevLett.108.155002	journal	April 2012
Structure formation in parallel ion flow and density profiles by cross-ferroic turbulent transport in linear magnetized plasma Kobayashi, T.; Inagaki, S.; Kosuga, Y. Physics of Plasmas, Vol. 23, Issue 10 https://doi.org/10.1063/1.4965915	journal	October 2016
Observations of abrupt changes in the fluctuation spectrum on LMD-U Arakawa, H.; Kamataki, K.; Inagaki, S. Plasma Physics and Controlled Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0741-3335/51/8/085001	journal	June 2009
Influence of sheared poloidal rotation on edge turbulence Biglari, H.; Diamond, P. H.; Terry, P. W. Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1 https://doi.org/10.1063/1.859529	journal	January 1990
Study of nonlinear spectral energy transfer in frequency domain Xu, M.; Tynan, G. R.; Holland, C. Physics of Plasmas, Vol. 16, Issue 4 https://doi.org/10.1063/1.3098538	journal	April 2009
Development of core ion temperature gradients and edge sheared flows in a helicon plasma device investigated by laser induced fluorescence measurements Thakur, S. C.; Gosselin, J. J.; McKee, J. Physics of Plasmas, Vol. 23, Issue 8 https://doi.org/10.1063/1.4960824	journal	August 2016
Physics of non-diffusive turbulent transport of momentum and the origins of spontaneous rotation in tokamaks Diamond, P. H.; McDevitt, C. J.; Gürcan, Ö. D. Nuclear Fusion, Vol. 49, Issue 4 https://doi.org/10.1088/0029-5515/49/4/045002	journal	March 2009
Thermal confinement bifurcation and the L‐ to H‐mode transition in tokamaks Hinton, F. L. Physics of Fluids B: Plasma Physics, Vol. 3, Issue 3 https://doi.org/10.1063/1.859866	journal	March 1991
A Concept of Cross-Ferroic Plasma Turbulence Inagaki, S.; Kobayashi, T.; Kosuga, Y. Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep22189	journal	February 2016
Up-gradient particle flux in a drift wave-zonal flow system Cui, L.; Tynan, G. R.; Diamond, P. H. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4921671	journal	May 2015
Waves and turbulence on a beta-plane Rhines, Peter B. Journal of Fluid Mechanics, Vol. 69, Issue 3 https://doi.org/10.1017/S0022112075001504	journal	June 1975

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Generation of parasitic axial flow by drift wave turbulence with broken symmetry: Theory and experiment Hong, R.; Li, J. C.; Hajjar, R. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017884	journal	May 2018
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
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

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