Flux-driven simulations of turbulence collapse

Park, G. Y.; Kim, S. S.; Jhang, Hogun; Diamond, P. H.; Rhee, T.; Xu, X. Q.

doi:10.1063/1.4914841

Title: Flux-driven simulations of turbulence collapse

Abstract

In this study, using self-consistent three-dimensional nonlinear simulations of tokamak turbulence, we show that an edge transport barrier (ETB) forms naturally due to mean E x B shear feedback through evolving pressure gradient once input power exceeds a threshold value. The temporal evolution and development of the transition are elucidated. Profiles, turbulence-driven flows and neoclassical coefficients are evolved self-consistently. A slow power ramp-up simulation shows that ETB transition is triggered by the turbulence-driven flows via an intermediate phase which involves coherent oscillation of turbulence intensity and E x B flow shear. A novel observation of the evolution is that the turbulence collapses and the ETB transition begins when R_T > 1 at t = t_R (R_T : normalized Reynolds power), while the conventional transition criterion (ω_{E x B} > γlin) is satisfied only after t = t_C (> t_R), when the mean ow shear grows due to positive feedback.

Authors:

Park, G. Y. ^[1]; Kim, S. S. ^[1]; Jhang, Hogun ^[1]; Diamond, P. H. ^[2];

^[1];

^[3]

National Fusion Research Inst., Daejeon (South Korea)
National Fusion Research Inst., Daejeon (South Korea); Univ. of California, San Diego, CA (United States). Dept. of Physics, CASS
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Thu Mar 12 00:00:00 EDT 2015

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

Sponsoring Org.:: USDOE; Ministry of Science, ICT and Future Planning (MSIP) of Korea

OSTI Identifier:: 1313561

Report Number(s):: LLNL-JRNL-662988
Journal ID: ISSN 1070-664X; PHPAEN

Grant/Contract Number:: AC52-07NA27344; WCI 2009-001

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 22; Journal Issue: 3; 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; H-mode; Zonal Flows; Bifurcations

Citation Formats


                    Park, G. Y., Kim, S. S., Jhang, Hogun, Diamond, P. H., Rhee, T., and Xu, X. Q. Flux-driven simulations of turbulence collapse.  United States: N. p., 2015. 
Web.  doi:10.1063/1.4914841.

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                    Park, G. Y., Kim, S. S., Jhang, Hogun, Diamond, P. H., Rhee, T., & Xu, X. Q. Flux-driven simulations of turbulence collapse.  United States.  https://doi.org/10.1063/1.4914841

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                    Park, G. Y., Kim, S. S., Jhang, Hogun, Diamond, P. H., Rhee, T., and Xu, X. Q. Thu .  
"Flux-driven simulations of turbulence collapse".  United States.  https://doi.org/10.1063/1.4914841.  https://www.osti.gov/servlets/purl/1313561.

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@article{osti_1313561,

  title        = {Flux-driven simulations of turbulence collapse},

  author       = {Park, G. Y. and Kim, S. S. and Jhang, Hogun and Diamond, P. H. and Rhee, T. and Xu, X. Q.},

  abstractNote = {In this study, using self-consistent three-dimensional nonlinear simulations of tokamak turbulence, we show that an edge transport barrier (ETB) forms naturally due to mean E x B shear feedback through evolving pressure gradient once input power exceeds a threshold value. The temporal evolution and development of the transition are elucidated. Profiles, turbulence-driven flows and neoclassical coefficients are evolved self-consistently. A slow power ramp-up simulation shows that ETB transition is triggered by the turbulence-driven flows via an intermediate phase which involves coherent oscillation of turbulence intensity and E x B flow shear. A novel observation of the evolution is that the turbulence collapses and the ETB transition begins when RT > 1 at t = tR (RT : normalized Reynolds power), while the conventional transition criterion (ωE x B > γlin) is satisfied only after t = tC (> tR), when the mean ow shear grows due to positive feedback.},

  doi          = {10.1063/1.4914841},

  journal      = {Physics of Plasmas},

  number       = 3,

  volume       = 22,

  place        = {United States},

  year         = {Thu Mar 12 00:00:00 EDT 2015},

  month        = {Thu Mar 12 00:00:00 EDT 2015}

}

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Works referenced in this record:

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Cziegler, I.; Tynan, G. R.; Diamond, P. H.
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Spatiotemporal Structures of Edge Limit-Cycle Oscillation before L-to-H Transition in the JFT-2M Tokamak
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L-H transition dynamics in fluid turbulence simulations with neoclassical force balance
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Experimental Evidence for the Intimate Interaction among Sheared Flows, Eddy Structures, Reynolds Stress, and Zonal Flows across a Transition to Improved Confinement
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Dynamical simulations of boundary plasma turbulence in divertor geometry
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Physics of Fluids B: Plasma Physics, Vol. 3, Issue 3
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Global two-fluid turbulence simulations of L-H transitions and edge localized mode dynamics in the COMPASS-D tokamak
journal, April 2010

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Turbulence simulations of transport barrier relaxations in tokamak edge plasmas
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Works referencing / citing this record:

A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1
journal, May 2018

Ku, S.; Chang, C. S.; Hager, R.
Physics of Plasmas, Vol. 25, Issue 5
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Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence
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Seto, H.; Xu, X. Q.; Dudson, B. D.
Physics of Plasmas, Vol. 26, Issue 5
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Quasilinear nature of L-mode edge turbulent transport in fluid nonlinear simulations
journal, October 2019

De Dominici, G.; Fuhr, G.; Bourdelle, C.
Nuclear Fusion, Vol. 59, Issue 12
DOI: 10.1088/1741-4326/ab3ec6

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Title: Flux-driven simulations of turbulence collapse

Abstract

Citation Formats

Observation of the L − H Confinement Bifurcation Triggered by a Turbulence-Driven Shear Flow in a Tokamak Plasma journal, March 2014

Turbulent-driven low-frequency sheared E × B flows as the trigger for the H-mode transition journal, July 2013

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Multiple Jets as PV Staircases: The Phillips Effect and the Resilience of Eddy-Transport Barriers journal, March 2008

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Screening of resonant magnetic perturbations by flows in tokamaks journal, May 2012

BOUT++: A framework for parallel plasma fluid simulations journal, September 2009

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Zonal flow production in the L–H transition in Alcator C-Mod journal, May 2014

Fluctuating zonal flows in the I-mode regime in Alcator C-Mod journal, May 2013

Spatiotemporal Structures of Edge Limit-Cycle Oscillation before L-to-H Transition in the JFT-2M Tokamak journal, July 2013

Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes journal, July 1994

Zonal flow triggers the L-H transition in the Experimental Advanced Superconducting Tokamak journal, July 2012

L-H transition dynamics in fluid turbulence simulations with neoclassical force balance journal, July 2014

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Heuristic closures for numerical simulations of neoclassical tearing modes journal, February 2002

Low-to-high confinement transition simulations in divertor geometry journal, May 2000

Role of Zonal Flow Predator-Prey Oscillations in Triggering the Transition to H-Mode Confinement journal, April 2012

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Experimental Evidence for the Intimate Interaction among Sheared Flows, Eddy Structures, Reynolds Stress, and Zonal Flows across a Transition to Improved Confinement journal, August 2013

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Thermal confinement bifurcation and the L‐ to H‐mode transition in tokamaks journal, March 1991

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Turbulence simulations of transport barrier relaxations in tokamak edge plasmas journal, March 2007

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Turbulent-driven low-frequency sheared E × B flows as the trigger for the H-mode transition
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Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma
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Multiple Jets as PV Staircases: The Phillips Effect and the Resilience of Eddy-Transport Barriers
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Spatio-temporal evolution of the L → I → H transition
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Dynamics of Low-Intermediate–High-Confinement Transitions in Toroidal Plasmas
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BOUT++: A framework for parallel plasma fluid simulations
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Fluctuating zonal flows in the I-mode regime in Alcator C-Mod
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Spatiotemporal Structures of Edge Limit-Cycle Oscillation before L-to-H Transition in the JFT-2M Tokamak
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Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
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journal, July 2012

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A semi-analytic power balance model for low (L) to high (H) mode transition power threshold
journal, June 2014

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Heuristic closures for numerical simulations of neoclassical tearing modes
journal, February 2002

Low-to-high confinement transition simulations in divertor geometry
journal, May 2000

Role of Zonal Flow Predator-Prey Oscillations in Triggering the Transition to H-Mode Confinement
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Influence of sheared poloidal rotation on edge turbulence
journal, January 1990

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
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Theory of plasma transport in toroidal confinement systems
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A new model of the L–H transition in tokamaks
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