MHD modeling of a DIII-D low-torque QH-mode discharge and comparison to observations

King, Jacob R.; Kruger, S. E.; Burrell, K. H.; Chen, X.; Garofalo, A. M.; Groebner, R. J.; Olofsson, K. E. J.; Pankin, A. Y.; Snyder, P. B.

doi:10.1063/1.4977467

Title: MHD modeling of a DIII-D low-torque QH-mode discharge and comparison to observations

Journal Article · 07 March 2017 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4977467 · OSTI ID:1347994

^[1];

^[2];

^[3]; Chen, X. ^[3]; Garofalo, A. M. ^[3]; Groebner, R. J. ^[3]; Olofsson, K. E. J. ^[4]; Pankin, A. Y. ^[5]; Snyder, P. B. ^[3]

Tech-X Corp., Boulder, CO (United States); Tech-X Corporation
Tech-X Corp., Boulder, CO (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
Tech-X Corp., Boulder, CO (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Extended-MHD modeling of DIII-D tokamak quiescent H-mode (QH-mode) discharges with nonlinear NIMROD simulations saturates into a turbulent state but does not saturate when the steady-state flow inferred from measurements is not included. This is consistent with the experimental observations of the quiescent regime on DIII-D. The simulation with flow develops into a saturated turbulent state where the n_Φ = 1 and 2 toroidal modes become dominant through an inverse cascade. Each mode in the range of n_Φ = 1–5 is dominant at a different time. Consistent with experimental observations during QH-mode, the simulated state leads to large particle transport relative to the thermal transport. Analysis shows that the amplitude and phase of the density and temperature perturbations differ resulting in greater fluctuation-induced convective particle transport relative to the convective thermal transport. As a result, comparison to magnetic-coil measurements shows that rotation frequencies differ between the simulation and experiment, which indicates that more sophisticated extended-MHD two-fluid modeling is required.

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Research Organization:: Tech-X Corp., Boulder, CO (United States); General Atomics, San Diego, CA (United States)

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

Grant/Contract Number:: FC02-06ER54875

OSTI ID:: 1347994

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 24; ISSN PHPAEN; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Physics of increased edge electron temperature and density turbulence during ELM-free QH-mode operation on DIII-D Sung, C.; Rhodes, T. L.; Staebler, G. M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017964	journal	May 2018
Access and sustainment of naturally ELM-free and small-ELM regimes Viezzer, E. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aac222	journal	September 2018

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