Pressure balance in a lower collisionality, attached tokamak scrape-off layer

Churchill, R. M.; Chang, C. S.; Ku, S.; Hager, R.; Maingi, R.; Stotler, D. P.; Qin, H.

doi:10.1088/1741-4326/ab2af9

Title: Pressure balance in a lower collisionality, attached tokamak scrape-off layer

Journal Article · 12 July 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab2af9 · OSTI ID:1558759

^[1]; Chang, C. S. ^[1]; Ku, S. ^[1]; Hager, R. ^[1]; Maingi, R. ^[1];

^[1]; Qin, H. ^[1]

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

Previously the gyrokinetic neoclassical code XGCa found that the pressure balance (or momentum balance) in the diverted scrape-off layer (SOL) does not follow that from the fluid description based on the Chew–Goldberger–Low (CGL) theory. In this paper a gyrocenter parallel momentum moment equation is derived for pressure balance (or momentum balance) in a tokamak SOL, for use in interpreting this difference. The new gyrocenter-fluid pressure balance equation allows identifying from the XGCa code results which physical processes dominate the setting of pressure variation in the scrape-off layer. This pressure balance equation is applied to the simulation of a DIII-D H-mode discharge, with a lower ion collisionality in the SOL, and the Coulomb and atomic collisions are not strong enough to yield a detached divertor plasma. It is found that the total pressure balance is much better matched using the gyrocenter parallel momentum moment equation. Electrons are shown to be dominantly adiabatic, while ions have multiple contributions to pressure balance, including terms originating from particle drifts. Furthermore, these results show that in strong gradient, low collisionality regions of the SOL, the typical fluid reductions miss important effects captured in the gyrokinetic model.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1558759

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (25)

A Suitable Boundary Condition for Bounded Plasma Simulation without Sheath Resolution Parker, S. E.; Procassini, R. J.; Birdsall, C. K. Journal of Computational Physics, Vol. 104, Issue 1 https://doi.org/10.1006/jcph.1993.1005	journal	January 1993
Gyrokinetic particle simulation model Lee, W. W. Journal of Computational Physics, Vol. 72, Issue 1 https://doi.org/10.1016/0021-9991(87)90080-5	journal	September 1987
A new hybrid-Lagrangian numerical scheme for gyrokinetic simulation of tokamak edge plasma Ku, S.; Hager, R.; Chang, C. S. Journal of Computational Physics, Vol. 315 https://doi.org/10.1016/j.jcp.2016.03.062	journal	June 2016
Kinetic simulations of scrape-off layer physics in the DIII-D tokamak Churchill, R. M.; Canik, J. M.; Chang, C. S. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.12.013	journal	August 2017
Variational principles of guiding centre motion Littlejohn, Robert G. Journal of Plasma Physics, Vol. 29, Issue 1 https://doi.org/10.1017/S002237780000060X	journal	February 1983
Viscosity in a magnetized plasma: Physical interpretation Hollweg, Joseph V. Journal of Geophysical Research: Space Physics, Vol. 90, Issue A8 https://doi.org/10.1029/JA090iA08p07620	journal	August 1985
Gyrokinetic neoclassical study of the bootstrap current in the tokamak edge pedestal with fully non-linear Coulomb collisions Hager, Robert; Chang, C. S. Physics of Plasmas, Vol. 23, Issue 4 https://doi.org/10.1063/1.4945615	journal	April 2016
A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1 Ku, S.; Chang, C. S.; Hager, R. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5020792	journal	May 2018
Nonlinear gyrofluid description of turbulent magnetized plasmas Brizard, Alain Physics of Fluids B: Plasma Physics, Vol. 4, Issue 5 https://doi.org/10.1063/1.860129	journal	May 1992
Neoclassical viscosity of a tokamak plasma with large mass flow Chang, C. S. Physics of Fluids B: Plasma Physics, Vol. 5, Issue 12 https://doi.org/10.1063/1.860553	journal	December 1993
Gyrofluid turbulence models with kinetic effects Dorland, W.; Hammett, G. W. Physics of Fluids B: Plasma Physics, Vol. 5, Issue 3 https://doi.org/10.1063/1.860934	journal	March 1993
Nonlinear gyrokinetic equations for tokamak microturbulence Hahm, T. S. Physics of Fluids, Vol. 31, Issue 9 https://doi.org/10.1063/1.866544	journal	September 1988
Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the Tokamak Fusion Test Reactor Beer, M. A.; Hammett, G. W.; Rewoldt, G. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872279	journal	May 1997
Particle and parallel momentum balance equations with inclusion of drifts, for modelling strong- to weakly-collisional edge plasmas Chankin, A. V.; Stangeby, P. C. Nuclear Fusion, Vol. 46, Issue 12 https://doi.org/10.1088/0029-5515/46/12/001	journal	October 2006
The Plasma Boundary of Magnetic Fusion Devices Ghendrih, Philippe Plasma Physics and Controlled Fusion, Vol. 43, Issue 2 https://doi.org/10.1088/0741-3335/43/2/702	journal	January 2001
Two-point analysis of the numerical modelling of detached divertor plasmas Kotov, V.; Reiter, D. Plasma Physics and Controlled Fusion, Vol. 51, Issue 11 https://doi.org/10.1088/0741-3335/51/11/115002	journal	October 2009
Basic physical processes and reduced models for plasma detachment Stangeby, P. C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaacf6	journal	March 2018
Total fluid pressure imbalance in the scrape-off layer of tokamak plasmas Churchill, R. M.; Canik, J. M.; Chang, C. S. Nuclear Fusion, Vol. 57, Issue 4 https://doi.org/10.1088/1741-4326/aa5fb1	journal	March 2017
The Boltzmann equation an d the one-fluid hydromagnetic equations in the absence of particle collisions Chew, G. F.; Goldberger, M. L.; Low, F. E. Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, Vol. 236, Issue 1204, p. 112-118 https://doi.org/10.1098/rspa.1956.0116	journal	July 1956
Fluid moment models for Landau damping with application to the ion-temperature-gradient instability Hammett, Gregory W.; Perkins, Francis W. Physical Review Letters, Vol. 64, Issue 25 https://doi.org/10.1103/PhysRevLett.64.3019	journal	June 1990
Foundations of nonlinear gyrokinetic theory Brizard, A. J.; Hahm, T. S. Reviews of Modern Physics, Vol. 79, Issue 2 https://doi.org/10.1103/RevModPhys.79.421	journal	April 2007
The Plasma Boundary of Magnetic Fusion Devices Stangeby, P. Series in Plasma Physics https://doi.org/10.1201/9781420033328	book	January 2000
Overview of the DIII-D Fusion Science Program Luxon, J. L.; Simonen, T. C.; Stambaugh, R. D. Fusion Science and Technology, Vol. 48, Issue 2 https://doi.org/10.13182/FST05-A1041	journal	October 2005
The Plasma Boundary of Magnetic Fusion Devices Stangeby, Peter C. Plasma Physics and Controlled Fusion, Vol. 43, Issue 2 https://doi.org/10.1887/0750305592	book	January 2000
Total Fluid Pressure Imbalance in the Scrape-Off Layer of Tokamak Plasmas Churchill, R. M.; Canik, J. M.; Chang, C. S. arXiv https://doi.org/10.48550/arxiv.1701.05485	text	January 2017

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