April 4-6

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Author: Eric C Howell
Requested Type: Poster
Submitted: 2022-03-04 10:10:34

Co-authors: T. Cote, J. Heo, D. Orlov, S.K. Kim, J.K. Park, S.M. Yang

Contact Info:
Tech-X Corporation
5621 Arapahoe Ave, Ste A
Boulder, CO   80303
United States

Abstract Text:
The fluid response to resonant magnetic perturbations (RMP) in KSTAR inner wall limited L-mode discharges is calculated using both NIMROD and M3D-C1. In the experiment, the in-vessel control coils (IVCC) are used to apply a predominantly n=1 magnetic perturbation. The currents in the IVCC coils are linearly ramped in time, and ECEI measurements provide experimental measurements of the resulting 2/1 island in both strongly screened and fully penetrated states. Single fluid n=1 responses calculations are performed at multiple time slices using both NIMROD and M3D-C1. The calculated response is compared between both codes, and the resulting 2/1 island width is compared with measurements of the island width inferred from ECEI measurements. In addition to the n=1 perturbation, the IVCC also introduces modest n=3 and higher-n perturbations. The linear response to these higher-n perturbations and their impact on the 2/1 island width is calculated. Initial two-fluid calculations and plans for nonlinear response calculations are discussed.

This work is supported by US DOE under grants: DE-SC0021185, DE-SC0014664, DE-AC02-09CH11466, DE-FG02-05ER54809