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

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. Lastly, 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.
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [2]
  1. Tech-X Corp., Boulder, CO (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FC02-08ER54972; AC02-05CH11231; FC02-06ER54875; FG02-08ER54972
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 6; Related Information: Dataset: J. R. King (2016). “NIMROD growth rates (1/s) by finite ele-ment poly_degree (columns) and case from “the impact of collisionality,FLR and parallel closure effects on instabilities in the tokamak pedestal:Numerical studies with the nimrod code”,” Zenodo.; Journal ID: ISSN 1070-664X
American Institute of Physics (AIP)
Research Org:
Tech-X Corp., Boulder, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 97 MATHEMATICS AND COMPUTING; extended-MHD NIMROD peeling ballooning mode plasma instability; electrical resistivity; edge localized modes; nonlinear dynamics; tokamaks; magnetohydrodynamics
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1420655