Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment

Myra, J. R.; Russell, D. A.; D’Ippolito, D. A.; Ahn, J.-W.; Maingi, R.; Maqueda, R. J.; Lundberg, D. P.; Stotler, D. P.; Zweben, S. J.; Boedo, J.; Umansky, M.

doi:10.1063/1.3526676

Title: Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment

Abstract

Reduced model simulations of turbulence in the edge and scrape-off-layer (SOL) region of a spherical torus or tokamak plasma are employed to address the physics of the scrape-off-layer heat flux width. The simulation model is an electrostatic two-dimensional fluid turbulence model, applied in the plane perpendicular to the magnetic field at the outboard midplane of the torus. The model contains curvature-driven-interchange modes, sheath losses, and both perpendicular turbulent diffusive and convective (blob) transport. These transport processes compete with classical parallel transport to set the SOL width. Midplane SOL profiles of density, temperature and parallel heat flux are obtained from the simulation and compared with experimental results from the National Spherical Torus Experiment (NSTX) to study the scaling of the heat flux width with power and plasma current. It is concluded that midplane turbulence is the main contributor to the SOL heat flux width for the low power H-mode discharges studied, while additional physics is required to explain the plasma current scaling of the SOL heat flux width observed experimentally in higher power discharges. Intermittent separatrix spanning convective cells are found to be the main mechanism that sets the near-SOL width in the simulations. The roles of sheared flows and blobmore » trapping vs. emission are discussed.« less

Authors:

Myra, J. R. ^[1]; Russell, D. A. ^[1]; D’Ippolito, D. A. ^[1]; Ahn, J.-W. ^[2]; Maingi, R. ^[2]; Maqueda, R. J. ^[3]; Lundberg, D. P. ^[3]; Stotler, D. P. ^[3]; Zweben, S. J. ^[3]; Boedo, J. ^[4]; Umansky, M. ^[5]

Lodestar Research Corp., Boulder, CO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Sat Jan 01 00:00:00 EST 2011

Research Org.:: Lodestar Research Corp., Boulder, CO (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Org.:: NSTX Team

OSTI Identifier:: 1076472

Grant/Contract Number:: FG02-02ER54678; FG02-03ER54731; FG02-97ER54392

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 18; Journal Issue: 1; 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


                    Myra, J. R., Russell, D. A., D’Ippolito, D. A., Ahn, J.-W., Maingi, R., Maqueda, R. J., Lundberg, D. P., Stotler, D. P., Zweben, S. J., Boedo, J., and Umansky, M. Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment.  United States: N. p., 2011. 
Web.  doi:10.1063/1.3526676.

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                    Myra, J. R., Russell, D. A., D’Ippolito, D. A., Ahn, J.-W., Maingi, R., Maqueda, R. J., Lundberg, D. P., Stotler, D. P., Zweben, S. J., Boedo, J., & Umansky, M. Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment.  United States.  https://doi.org/10.1063/1.3526676

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                    Myra, J. R., Russell, D. A., D’Ippolito, D. A., Ahn, J.-W., Maingi, R., Maqueda, R. J., Lundberg, D. P., Stotler, D. P., Zweben, S. J., Boedo, J., and Umansky, M. Sat .  
"Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment".  United States.  https://doi.org/10.1063/1.3526676.  https://www.osti.gov/servlets/purl/1076472.

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@article{osti_1076472,

  title        = {Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment},

  author       = {Myra, J. R. and Russell, D. A. and D’Ippolito, D. A. and Ahn, J.-W. and Maingi, R. and Maqueda, R. J. and Lundberg, D. P. and Stotler, D. P. and Zweben, S. J. and Boedo, J. and Umansky, M.},

  abstractNote = {Reduced model simulations of turbulence in the edge and scrape-off-layer (SOL) region of a spherical torus or tokamak plasma are employed to address the physics of the scrape-off-layer heat flux width. The simulation model is an electrostatic two-dimensional fluid turbulence model, applied in the plane perpendicular to the magnetic field at the outboard midplane of the torus. The model contains curvature-driven-interchange modes, sheath losses, and both perpendicular turbulent diffusive and convective (blob) transport. These transport processes compete with classical parallel transport to set the SOL width. Midplane SOL profiles of density, temperature and parallel heat flux are obtained from the simulation and compared with experimental results from the National Spherical Torus Experiment (NSTX) to study the scaling of the heat flux width with power and plasma current. It is concluded that midplane turbulence is the main contributor to the SOL heat flux width for the low power H-mode discharges studied, while additional physics is required to explain the plasma current scaling of the SOL heat flux width observed experimentally in higher power discharges. Intermittent separatrix spanning convective cells are found to be the main mechanism that sets the near-SOL width in the simulations. The roles of sheared flows and blob trapping vs. emission are discussed.},

  doi          = {10.1063/1.3526676},

  journal      = {Physics of Plasmas},

  number       = 1,

  volume       = 18,

  place        = {United States},

  year         = {Sat Jan 01 00:00:00 EST 2011},

  month        = {Sat Jan 01 00:00:00 EST 2011}

}

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Similar Records

Title: Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment

Abstract

Citation Formats

Plasma–surface interaction, scrape-off layer and divertor physics: implications for ITER journal, August 2007

Divertor heat flux scaling with heating power and plasma current in H-mode discharges in the national spherical torus experiment journal, June 2007

On scaling laws in scrape-off-layer plasmas journal, November 1994

SOL width scaling from consideration of edge transport in tokamaks journal, March 1999

Comparison of theoretical models for scrape-off layer widths with data from COMPASS-D, JET and Alcator C-Mod journal, February 1999

L-mode SOL width scaling in the MAST spherical tokamak journal, July 2006

Dissipative processes in interchange driven scrape-off layer turbulence journal, April 2007

Recent theoretical progress in understanding coherent structures in edge and SOL turbulence journal, October 2008

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Initial physics results from the National Spherical Torus Experiment journal, May 2001

Blob birth and transport in the tokamak edge plasma: Analysis of imaging data journal, September 2006

Fluctuations and transport in the TCV scrape-off layer journal, June 2007

Blob Transport in the Plasma Edge: a Review journal, January 2009

Theoretical understanding of turbulent transport in the SOL journal, March 2003

Transport scaling in interchange-driven toroidal plasmas journal, June 2009

High-speed imaging of edge turbulence in NSTX journal, December 2003

Gas puff imaging of edge turbulence (invited) journal, March 2003

Progress towards the validation of models of the behavior of neutral helium in gas puff imaging experiments journal, June 2007

Transport of perpendicular edge momentum by drift-interchange turbulence and blobs journal, March 2008

Bifurcation theory of poloidal rotation in tokamaks: A model for L-H transition journal, November 1989

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices journal, May 1997

Suppression of turbulence and transport by sheared flow journal, January 2000

Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod plasmas journal, May 2009

Downstream heat flux profile versus midplane T profile in tokamaks journal, January 2010

Fast scanning probe for the NSTX spherical tokamak journal, December 2009

Edge and scrape-off layer tokamak plasma turbulence simulation using two-field fluid model journal, July 2005

Mechanism for blob generation in the TORPEX toroidal plasma journal, May 2008

Theoretical analysis of the influence of external biasing on long range turbulent transport in the scrape-off layer journal, September 2003

Dynamics of blobs in scrape-off-layer/shadow regions of tokamaks and linear devices journal, November 2003

Convective transport in the scrape-off-layer by nonthermalized spinning blobs journal, September 2004

Generation of mesoscale convective structures in tokamak edge plasma journal, October 2007

Quiet periods in edge turbulence preceding the L-H transition in the National Spherical Torus Experiment journal, October 2010

Study of statistical properties of edge turbulence in the National Spherical Torus Experiment with the gas puff imaging diagnostic journal, October 2007

Multi-machine scaling of the divertor peak heat flux and width for L-mode and H-mode discharges journal, March 1999

Property of an X-point generated velocity-space hole in a diverted tokamak plasma edge journal, December 2004

ELMs and strike point jumps journal, March 2005

Geometrical Effects in Plasma Stability and Dynamics of Coherent Structures in the Divertor journal, March 2008

Convective transport by intermittent blob-filaments: Comparison of theory and experiment journal, June 2011

Suppression of drift wave turbulence and zonal flow formation by changing axial boundary conditions in a cylindrical magnetized plasma device journal, January 2013

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Three dimensional simulations of plasma filaments in the scrape off layer: A comparison with models of reduced dimensionality journal, December 2014

Turbulent transport regimes and the scrape-off layer heat flux width journal, April 2015

Theory based scaling of edge turbulence and implications for the scrape-off layer width journal, November 2016

Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices journal, April 2017

Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks journal, December 2011

Theory-based scaling of the SOL width in circular limited tokamak plasmas journal, November 2013

Theory of the scrape-off layer width in inner-wall limited tokamak plasmas journal, March 2014

Edge and SOL turbulence and blob variations over a large database in NSTX journal, September 2015

Plasma shaping effects on tokamak scrape-off layer turbulence journal, January 2017

Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER journal, August 2017

Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data] dataset, April 2018

Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation journal, July 2018

Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data] dataset, April 2018

Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER text, January 2017

Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation text, January 2018

Plasma–surface interaction, scrape-off layer and divertor physics: implications for ITER
journal, August 2007

Divertor heat flux scaling with heating power and plasma current in H-mode discharges in the national spherical torus experiment
journal, June 2007

On scaling laws in scrape-off-layer plasmas
journal, November 1994

SOL width scaling from consideration of edge transport in tokamaks
journal, March 1999

Comparison of theoretical models for scrape-off layer widths with data from COMPASS-D, JET and Alcator C-Mod
journal, February 1999

L-mode SOL width scaling in the MAST spherical tokamak
journal, July 2006

Dissipative processes in interchange driven scrape-off layer turbulence
journal, April 2007

Recent theoretical progress in understanding coherent structures in edge and SOL turbulence
journal, October 2008

Saturation mechanisms for edge turbulence
journal, December 2009

Initial physics results from the National Spherical Torus Experiment
journal, May 2001

Blob birth and transport in the tokamak edge plasma: Analysis of imaging data
journal, September 2006

Fluctuations and transport in the TCV scrape-off layer
journal, June 2007

Blob Transport in the Plasma Edge: a Review
journal, January 2009

Theoretical understanding of turbulent transport in the SOL
journal, March 2003

Transport scaling in interchange-driven toroidal plasmas
journal, June 2009

High-speed imaging of edge turbulence in NSTX
journal, December 2003

Gas puff imaging of edge turbulence (invited)
journal, March 2003

Progress towards the validation of models of the behavior of neutral helium in gas puff imaging experiments
journal, June 2007

Transport of perpendicular edge momentum by drift-interchange turbulence and blobs
journal, March 2008

Bifurcation theory of poloidal rotation in tokamaks: A model for L-H transition
journal, November 1989

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
journal, May 1997

Suppression of turbulence and transport by sheared flow
journal, January 2000

Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod plasmas
journal, May 2009

Downstream heat flux profile versus midplane T profile in tokamaks
journal, January 2010

Fast scanning probe for the NSTX spherical tokamak
journal, December 2009

Edge and scrape-off layer tokamak plasma turbulence simulation using two-field fluid model
journal, July 2005

Mechanism for blob generation in the TORPEX toroidal plasma
journal, May 2008

Theoretical analysis of the influence of external biasing on long range turbulent transport in the scrape-off layer
journal, September 2003

Dynamics of blobs in scrape-off-layer/shadow regions of tokamaks and linear devices
journal, November 2003

Convective transport in the scrape-off-layer by nonthermalized spinning blobs
journal, September 2004

Generation of mesoscale convective structures in tokamak edge plasma
journal, October 2007

Quiet periods in edge turbulence preceding the L-H transition in the National Spherical Torus Experiment
journal, October 2010

Study of statistical properties of edge turbulence in the National Spherical Torus Experiment with the gas puff imaging diagnostic
journal, October 2007

Multi-machine scaling of the divertor peak heat flux and width for L-mode and H-mode discharges
journal, March 1999

Property of an X-point generated velocity-space hole in a diverted tokamak plasma edge
journal, December 2004

ELMs and strike point jumps
journal, March 2005

Geometrical Effects in Plasma Stability and Dynamics of Coherent Structures in the Divertor
journal, March 2008

Convective transport by intermittent blob-filaments: Comparison of theory and experiment
journal, June 2011

Suppression of drift wave turbulence and zonal flow formation by changing axial boundary conditions in a cylindrical magnetized plasma device
journal, January 2013

Ideal ballooning modes in the tokamak scrape-off layer
journal, May 2013

Three dimensional simulations of plasma filaments in the scrape off layer: A comparison with models of reduced dimensionality
journal, December 2014

Turbulent transport regimes and the scrape-off layer heat flux width
journal, April 2015

Theory based scaling of edge turbulence and implications for the scrape-off layer width
journal, November 2016

Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices
journal, April 2017

Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks
journal, December 2011

Theory-based scaling of the SOL width in circular limited tokamak plasmas
journal, November 2013

Theory of the scrape-off layer width in inner-wall limited tokamak plasmas
journal, March 2014

Edge and SOL turbulence and blob variations over a large database in NSTX
journal, September 2015

Plasma shaping effects on tokamak scrape-off layer turbulence
journal, January 2017

Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER
journal, August 2017

Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data]
dataset, April 2018

Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation
journal, July 2018

Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data]
dataset, April 2018

Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER
text, January 2017

Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation
text, January 2018