Total fluid pressure imbalance in the scrape-off layer of tokamak plasmas

Churchill, Randy M.; Canik, John M.; Chang, C. S.; Hager, R.; Leonard, Anthony W.; Maingi, Rajesh; Nazikian, Raffi M.; Stotler, Daren P.

doi:10.1088/1741-4326/aa5fb1

Title: Total fluid pressure imbalance in the scrape-off layer of tokamak plasmas

Journal Article · Fri Mar 10 00:00:00 EST 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa5fb1· OSTI ID:1414947

^[1]; Canik, John M. ^[2];

^[1];

^[1]; Leonard, Anthony W. ^[3];

^[1]; Nazikian, Raffi M. ^[1];

^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)

Simulations using the fully kinetic neoclassical code XGCa (X-point included guiding-center axisymmetric) were undertaken to explore the impact of kinetic effects on scrape-off layer (SOL) physics in DIII-D H-mode plasmas. XGCa is a total-f, gyrokinetic code which self-consistently calculates the axisymmetric electrostatic potential and plasma dynamics, and includes modules for Monte Carlo neutral transport. Previously presented XGCa results showed several noteworthy features, including large variations of ion density and pressure along field lines in the SOL, experimentally relevant levels of SOL parallel ion flow (Mach number similar to 0.5), skewed ion distributions near the sheath entrance leading to subsonic flow there, and elevated sheath potentials (Churchill 2016 Nucl. Mater. Energy 1-6). In this paper, we explore in detail the question of pressure balance in the SOL, as it was observed in the simulation that there was a large deviation from a simple total pressure balance (the sum of ion and electron static pressure plus ion inertia). It will be shown that both the contributions from the ion viscosity (driven by ion temperature anisotropy) and neutral source terms can be substantial, and should be retained in the parallel momentum equation in the SOL, but still falls short of accounting for the observed fluid pressure imbalance in the XGCa simulation results.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

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

Grant/Contract Number:: FC02-04ER54698; AC02-06CH11357; AC05-00OR22725; AC02-09CH11466

OSTI ID:: 1414947

Alternate ID(s):: OSTI ID: 1353396

Journal Information:: Nuclear Fusion, Vol. 57, Issue 4; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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References (16)

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X-point ion orbit physics in scrape-off layer and generation of a localized electrostatic potential perturbation around X-point Chang, C. S.; Ku, S.; Churchill, R. M. Physics of Plasmas, Vol. 26, Issue 1 https://doi.org/10.1063/1.5072795	journal	January 2019
Pressure balance in a lower collisionality, attached tokamak scrape-off layer Churchill, R. M.; Chang, C. S.; Ku, S. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2af9	journal	July 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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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
scrape-off layer
pressure
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viscosity
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Title: Total fluid pressure imbalance in the scrape-off layer of tokamak plasmas

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