The impact of collisionality, FLR, and parallel closure effects on instabilities in the tokamak pedestal: Numerical studies with the NIMROD code

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4954302· OSTI ID:22598931

King, J. R.; Pankin, A. Y.; Kruger, S. E. ^[1]; Snyder, P. B. ^[2]

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1. Tech-X Corporation, 5621 Arapahoe Ave., Boulder, Colorado 80303 (United States)
2. General Atomics, PO Box 85608, San Diego, California 92186–5608 (United States)

The extended-MHD NIMROD code [C. R. Sovinec and J. R. King, J. Comput. Phys. 229, 5803 (2010)] is verified against the ideal-MHD ELITE code [H. R. Wilson et al., Phys. Plasmas 9, 1277 (2002)] on a diverted tokamak discharge. When the NIMROD model complexity is increased incrementally, resistive and first-order finite-Larmour radius effects are destabilizing and stabilizing, respectively. The full result is compared to local analytic calculations which are found to overpredict both the resistive destabilization and drift stabilization in comparison to the NIMROD computations.

• OSTI ID: 22598931
• Journal Information: Physics of Plasmas, Vol. 23, Issue 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CALCULATION METHODS
CLOSURES
COMPARATIVE EVALUATIONS
INSTABILITY
MAGNETOHYDRODYNAMICS
N CODES
NIMROD
NUMERICAL ANALYSIS
PLASMA
STABILIZATION
TOKAMAK DEVICES