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Title: Multi-region approach to free-boundary three-dimensional tokamak equilibria and resistive wall instabilities

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4948722· OSTI ID:22600112
 [1];  [2]; ;  [3]
  1. General Atomics, La Jolla, California 92186 (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
  3. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
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Free-boundary 3D tokamak equilibria and resistive wall instabilities are calculated using a new resistive wall model in the two-fluid M3D-C1 code. In this model, the resistive wall and surrounding vacuum region are included within the computational domain. This implementation contrasts with the method typically used in fluid codes in which the resistive wall is treated as a boundary condition on the computational domain boundary and has the advantage of maintaining purely local coupling of mesh elements. This new capability is used to simulate perturbed, free-boundary non-axisymmetric equilibria; the linear evolution of resistive wall modes; and the linear and nonlinear evolution of axisymmetric vertical displacement events (VDEs). Calculated growth rates for a resistive wall mode with arbitrary wall thickness are shown to agree well with the analytic theory. Equilibrium and VDE calculations are performed in diverted tokamak geometry, at physically realistic values of dissipation, and with resistive walls of finite width. Simulations of a VDE disruption extend into the current-quench phase, in which the plasma becomes limited by the first wall, and strong currents are observed to flow in the wall, in the SOL, and from the plasma to the wall.

OSTI ID:
22600112
Journal Information:
Physics of Plasmas, Vol. 23, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
Country of Publication:
United States
Language:
English

Cited By (8)

Modelling of NSTX hot vertical displacement events using M3D-C1 journal May 2018
Predict-first experimental analysis using automated and integrated magnetohydrodynamic modeling journal May 2018
Axisymmetric simulations of vertical displacement events in tokamaks: A benchmark of M3D-C 1 , NIMROD, and JOREK journal February 2020
Effect of rotation zero-crossing on single-fluid plasma response to three-dimensional magnetic perturbations journal February 2017
Local and integral disruption forces on the tokamak wall journal March 2018
Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade journal February 2018
3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks journal November 2018
Vertical forces during vertical displacement events in an ITER plasma and the role of halo currents journal October 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AXIAL SYMMETRY
BOUNDARY CONDITIONS
EQUILIBRIUM
FIRST WALL
FLUIDS
GEOMETRY
INSTABILITY
NONLINEAR PROBLEMS
PLASMA
SIMULATION
THICKNESS
THREE-DIMENSIONAL CALCULATIONS
TOKAMAK DEVICES
WALLS
WIDTH