Analysis of drift effects on the tokamak power scrape-off width using SOLPS-ITER

Meier, E. T.; Goldston, R. J.; Kaveeva, E. G.; Makowski, M. A.; Mordijck, S.; Rozhansky, V. A.; Senichenkov, I. Yu; Voskoboynikov, S. P.

doi:10.1088/0741-3335/58/12/125012

Title: Analysis of drift effects on the tokamak power scrape-off width using SOLPS-ITER

Journal Article · Wed Nov 02 00:00:00 EDT 2016 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/58/12/125012· OSTI ID:1335693

Meier, E. T. ^[1];

^[2]; Kaveeva, E. G. ^[3]; Makowski, M. A. ^[4]; Mordijck, S. ^[1]; Rozhansky, V. A. ^[3]; Senichenkov, I. Yu ^[3]; Voskoboynikov, S. P. ^[3]

College of William and Mary, Williamsburg, VA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Peter the Great St. Petersburg Polytechnic Univ., St. Petersburg (Russia)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

SOLPS-ITER, a comprehensive 2D scrape-off layer modeling package, is used to examine the physical mechanisms that set the scrape-off width ($${{\lambda}_{q}}$$ ) for inter-ELM power exhaust. Guided by Goldston's heuristic drift (HD) model, which shows remarkable quantitative agreement with experimental data, this research examines drift effects on $${{\lambda}_{q}}$$ in a DIII-D H-mode magnetic equilibrium. As a numerical expedient, a low target recycling coefficient of 0.9 is used in the simulations, resulting in outer target plasma that is sheath limited instead of conduction limited as in the experiment. Scrape-off layer (SOL) particle diffusivity (D_SOL) is scanned from 1 to 0.1 m2 s^–1. Across this diffusivity range, outer divertor heat flux is dominated by a narrow (~3–4mm when mapped to the outer midplane) electron convection channel associated with thermoelectric current through the SOL from outer to inner divertor. An order-unity up–down ion pressure asymmetry allows net ion drift flux across the separatrix, facilitated by an artificial mechanism that mimics the anomalous electron transport required for overall ambipolarity in the HD model. At $${{D}_{\text{SOL}}}=0.1$$ m2 s^–1, the density fall-off length is similar to the electron temperature fall-off length, as predicted by the HD model and as seen experimentally. Furthermore, this research represents a step toward a deeper understanding of the power scrape-off width, and serves as a basis for extending fluid modeling to more experimentally relevant, high-collisionality regimes.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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

Grant/Contract Number:: SC0010434

OSTI ID:: 1335693

Alternate ID(s):: OSTI ID: 1330720

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 58, Issue 12; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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References (26)

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Drift effects and up-down asymmetry in balanced double-null DIII-D divertor configurations Meier, E. T.; Covele, B.; Guo, H. Y. Contributions to Plasma Physics, Vol. 58, Issue 6-8 https://doi.org/10.1002/ctpp.201700167	journal	June 2018
Study of power width scaling in scrape-off layer with 2D electrostatic turbulence code based on EAST L-mode discharges Liu, X.; Nielsen, A. H.; Rasmussen, J. J. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5083063	journal	April 2019
Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework Li, N. M.; Xu, X. Q.; Hughes, J. W. AIP Advances, Vol. 10, Issue 1 https://doi.org/10.1063/1.5126884	journal	January 2020
Drift driven cross-field transport and scrape-off layer width in the limit of low anomalous transport Baudoin, Camille; Tamain, Patrick; Bufferand, Hugo Plasma Physics and Controlled Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1361-6587/aad650	journal	August 2018
Statistical study of particle flux footprint widths with tungsten divertor in EAST Liu, X.; Naulin, V.; Xu, J. C. Plasma Physics and Controlled Fusion, Vol. 61, Issue 4 https://doi.org/10.1088/1361-6587/aaf762	journal	February 2019
Drift effects on W7-X divertor heat and particle fluxes Hammond, K. C.; Gao, Y.; Jakubowski, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab4825	journal	October 2019
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
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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