Abstract Details
Abstracts
Author: David A. Arnold
Requested Type: Poster
Submitted: 2023-03-31 13:00:02
Co-authors: R.N. Chandra, C.J. Hansen, J.P. Levesque, Boting Li, M.E. Mauel
Contact Info:
Columbia University
100 Morningside Drive Apt 5G
New York, NY 10027
United States
Abstract Text:
The NIMROD [1] code is used to validate multiphysics models (MHD + resistive wall) for the prediction of mode structures and Scrape-Off-Layer (SOL) currents in tokamaks using high-resolution current, magnetic, and optical diagnostics of the HBT-EP tokamak [2]. NIMROD’s existing thin resistive wall model has been extended to include non-axisymmetric wall resistivity, capturing the effects of ports and other wall structures. Simulations with a resistive wall observe non-disruptive, saturated, mode activity, consistent with experimental data on HBT-EP. These novel simulations of saturated RWMs will be presented in plots of magnetic mode amplitude and synthetic magnetic and EUV diagnostics. The effects of varying wall resistivity with toroidal mode number, to capture 3D wall features, are investigated in NIMROD within the context of a saturated resistive wall mode. Further work on improving boundary conditions for the resistive wall to capture n=0 evolution of the equilibrium profile will also be presented. Applications of the new resistive, asymmetric wall simulations toward better understanding RWMs with realistic wall geometry and applying REMC fields during disruptions will also be discussed. Plans to validate numerical models of wall-connected currents using the suite of available diagnostics on HBT-EP will also be presented with the goal of improving wall models for ITER and next-step devices.
[1] C. Sovinec et al., J. Comput. Phys. (2004)
[2] J. Levesque et al., Nucl. Fusion (2017)
Comments:
Please place next to poster by Chris Hansen (Columbia University)