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, Joon-Wook; Maingi, Rajesh; Maqueda, R J; Lundberg, D P; Stotler, D P; Zweben, S J; Boedo, J; Umansky, M W

doi:10.1063/1.3526676

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

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3526676· OSTI ID:1028765

Myra, J R ^[1]; Russell, D A ^[1]; D'Ippolito, D A ^[1]; Ahn, Joon-Wook ^[2]; Maingi, Rajesh ^[3]; Maqueda, R J ^[4]; Lundberg, D P ^[4]; Stotler, D P ^[4]; Zweben, S J ^[4]; Boedo, J ^[5]; Umansky, M W ^[6]

Lodestar Research Corporation
Oak Ridge National Laboratory (ORNL)
ORNL
Princeton Plasma Physics Laboratory (PPPL)
University of California, San Diego
Lawrence Livermore National Laboratory (LLNL)

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 [S. M. Kaye et al., Phys. Plasmas 8, 1977 (2001)] 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 fully 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 versus emission are discussed.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: DE-AC05-00OR22725

OSTI ID:: 1028765

Journal Information:: Physics of Plasmas, Vol. 18, Issue 1; ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Convective transport by intermittent blob-filaments: Comparison of theory and experiment D’Ippolito, D. A.; Myra, J. R.; Zweben, S. J. Physics of Plasmas, Vol. 18, Issue 6 https://doi.org/10.1063/1.3594609	journal	June 2011
Suppression of drift wave turbulence and zonal flow formation by changing axial boundary conditions in a cylindrical magnetized plasma device Chakraborty Thakur, Saikat; Xu, Min; Manz, Peter Physics of Plasmas, Vol. 20, Issue 1 https://doi.org/10.1063/1.4775775	journal	January 2013
Ideal ballooning modes in the tokamak scrape-off layer Halpern, Federico D.; Jolliet, Sebastien; Loizu, Joaquim Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4807333	journal	May 2013
Three dimensional simulations of plasma filaments in the scrape off layer: A comparison with models of reduced dimensionality Easy, L.; Militello, F.; Omotani, J. Physics of Plasmas, Vol. 21, Issue 12 https://doi.org/10.1063/1.4904207	journal	December 2014
Turbulent transport regimes and the scrape-off layer heat flux width Myra, J. R.; D'Ippolito, D. A.; Russell, D. A. Physics of Plasmas, Vol. 22, Issue 4 https://doi.org/10.1063/1.4919255	journal	April 2015
Theory based scaling of edge turbulence and implications for the scrape-off layer width Myra, J. R.; Russell, D. A.; Zweben, S. J. Physics of Plasmas, Vol. 23, Issue 11 https://doi.org/10.1063/1.4966564	journal	November 2016
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices Zweben, S. J.; Terry, J. L.; Stotler, D. P. Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4981873	journal	April 2017
Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks Goldston, R. J. Nuclear Fusion, Vol. 52, Issue 1 https://doi.org/10.1088/0029-5515/52/1/013009	journal	December 2011
Theory-based scaling of the SOL width in circular limited tokamak plasmas Halpern, F. D.; Ricci, P.; Labit, B. Nuclear Fusion, Vol. 53, Issue 12 https://doi.org/10.1088/0029-5515/53/12/122001	journal	November 2013
Theory of the scrape-off layer width in inner-wall limited tokamak plasmas Halpern, F. D.; Ricci, P.; Jolliet, S. Nuclear Fusion, Vol. 54, Issue 4 https://doi.org/10.1088/0029-5515/54/4/043003	journal	March 2014
Edge and SOL turbulence and blob variations over a large database in NSTX Zweben, S. J.; Davis, W. M.; Kaye, S. M. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093035	journal	September 2015
Plasma shaping effects on tokamak scrape-off layer turbulence Riva, Fabio; Lanti, Emmanuel; Jolliet, Sébastien Plasma Physics and Controlled Fusion, Vol. 59, Issue 3 https://doi.org/10.1088/1361-6587/aa5322	journal	January 2017
Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER Chang, C. S.; Ku, S.; Loarte, A. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7efb	journal	August 2017
Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data] Charidakos, Ioannis Keramidas; Myra, James; Parker, Scott Zenodo-Supplementary information for journal article at DOI: 10.1063/1.5037723, 15 files (333.7 kB) https://doi.org/10.5281/zenodo.1230040	dataset	April 2018
Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation Keramidas Charidakos, I.; Myra, J. R.; Parker, S. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5037723	journal	July 2018
Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data] Charidakos, Ioannis Keramidas; Myra, James; Parker, Scott Zenodo-Supplementary information for journal article at DOI: 10.1063/1.5037723, 15 files (333.7 kB) https://doi.org/10.5281/zenodo.1230039	dataset	April 2018
Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER Chang, C. S.; Ku, S.; Loarte, A. arXiv https://doi.org/10.48550/arxiv.1701.05507	text	January 2017
Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation Charidakos, I. Keramidas; Myra, J. R.; Parker, S. arXiv https://doi.org/10.48550/arxiv.1804.10301	text	January 2018

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC CURRENTS
ELECTROSTATICS
HEAT FLUX
MAGNETIC FIELDS
PHYSICS
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SIMULATION
SOLS
TRANSPORT
TRAPPING
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Title: Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment

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References (38)

Cited By (18)

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