Abstract Details
Abstracts
Author: Eric Howell
Requested Type: Poster
Submitted: 2024-04-12 11:57:00
Co-authors: T. Cote, C. Zhao, D. Orlov, M.J. Choi, J. Heo, S.K. Kim, S.M. Yang, V. Khavin
Contact Info:
Tech-X Corporation
5621 Arapahoe Ave, Ste A
Boulder, CO 80303
United States
Abstract Text:
Edge localized modes (ELMs) produce cyclic heats loads which severely limit the lifetime of divertor targets and other plasma facing components in future burning plasma reactors. One solution to mitigating the heat loads involves the application of external three dimension resonant magnetic field perturbations (RMP). The current understanding is that RMPs induce a island near the top of the pedestal which enhances the transport and limits the pedestal below ELM stability thresholds. Based on this paradigm, validated predictive models that quantify the plasma response to the applied RMPs are needed for the design and operation of future experiments.
Here we discuss ongoing efforts to benchmark the RMP computations in the MHD codes NIMROD and M3D-C1 in KSTAR discharges. Two discharges are considered. First, we consider an inner-wall limited L-mode discharge. Here the the in-vessel coil currents (IVCC) are used to apply a predominantly n=1 RMP. This excites a 2/1 island which is observed of the ECEI diagnostic. The IVCC coil currents are ramped in time, and computations consider two times: early in time before the island locks and later in time after the island lock. The calculated response is compared with the experimental island width inferred from the ECEI measurements. The second case is an ELM-suppressed diverted H-mode discharge. Here we consider a time after the application of the RMP in the ELM suppressed state. The calculated temperature perturbations is compared against the ECEI measurements. Additionally, we compare the calculated magnetic footprint with striations in the divertor heat flux.
This work is supported by US DOE under grants: DE-SC0021185, DE-SC0014664, DE-AC02-09CH11466, DE-FG02-05ER54809
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