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

Abstract

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.

Authors:
 [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)
Publication Date:
OSTI Identifier:
22600112
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Ferraro, N. M., E-mail: nferraro@pppl.gov, Lao, L. L., Jardin, S. C., Shephard, M. S., and Zhang, F. Multi-region approach to free-boundary three-dimensional tokamak equilibria and resistive wall instabilities. United States: N. p., 2016. Web. doi:10.1063/1.4948722.
Ferraro, N. M., E-mail: nferraro@pppl.gov, Lao, L. L., Jardin, S. C., Shephard, M. S., & Zhang, F. Multi-region approach to free-boundary three-dimensional tokamak equilibria and resistive wall instabilities. United States. doi:10.1063/1.4948722.
Ferraro, N. M., E-mail: nferraro@pppl.gov, Lao, L. L., Jardin, S. C., Shephard, M. S., and Zhang, F. Sun . "Multi-region approach to free-boundary three-dimensional tokamak equilibria and resistive wall instabilities". United States. doi:10.1063/1.4948722.
@article{osti_22600112,
title = {Multi-region approach to free-boundary three-dimensional tokamak equilibria and resistive wall instabilities},
author = {Ferraro, N. M., E-mail: nferraro@pppl.gov and Lao, L. L. and Jardin, S. C. and Shephard, M. S. and Zhang, F.},
abstractNote = {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.},
doi = {10.1063/1.4948722},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}

Works referencing / citing this record:

Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade
journal, February 2018


Effect of rotation zero-crossing on single-fluid plasma response to three-dimensional magnetic perturbations
journal, February 2017

  • Lyons, B. C.; Ferraro, N. M.; Paz-Soldan, C.
  • Plasma Physics and Controlled Fusion, Vol. 59, Issue 4
  • DOI: 10.1088/1361-6587/aa5860

Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade
journal, February 2018