Abstract Details
Abstracts
Author: Andreas Kleiner
Requested Type: Poster
Submitted: 2025-03-14 15:40:58
Co-authors: F.Ebrahimi, A.Pankin, K.Imada, N.M.Ferraro, L.Kogan
Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, New Jersey 08543
United States
Abstract Text:
We investigate how non-ideal-MHD effects, in particular plasma resistivity, impact the peeling-ballooning stability thresholds in MAST and MAST-U using the M3D-C1 code. This is an extension of previous modeling that was performed on NSTX to other spherical tokamaks. We find a clear resistive scaling for peeling-ballooning modes in MAST and MAST-U, and in the MAST-U case we find that resistivity can play a significant role in triggering ELMs. The growth rates of the resistive modes are also benchmarked with the NIMROD code. In MAST-U we find that the plasma is slightly unstable to peeling-ballooning modes, but is fully stabilized once diamagnetic effects are considered in terms of a growth rate normalization. Resistivity destabilizes the modes, and the peeling-ballooning unstable domain is considerably expanded in both, MAST and MAST-U. The effect of equilibrium rotation on (resistive) peeling-ballooning modes is also studied, and the results indicate that equilibrium flows can have a complex effect on stability that goes beyond being generally stabilizing or destabilizing.
This work was supported by the DOE SciDAC program under Award Numbers DE-AC02-09CH11466
Characterization: 1.0
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