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Optimization of 3D controlled ELM-free state with recovered global confinement for KSTAR with n=1 resonant magnetic field perturbation

Author(s)
Kim, S. K.Shousha, R.Hahn, S. H.Nelson, A. O.Wai, J.Yang, S. M.Park, J-KNazikian, R.Logan, N. C.Jeon, Y. M.In, YongkyoonLee, J. H.Kim, J.Lee, C. Y.Na, Y-SKolemen, E.
Issued Date
2022-02
DOI
10.1088/1741-4326/ac4369
URI
https://scholarworks.unist.ac.kr/handle/201301/57154
Fulltext
https://iopscience.iop.org/article/10.1088/1741-4326/ac4369
Citation
NUCLEAR FUSION, v.62, no.2, pp.026043
Abstract
Mitigation of deleterious heat flux from edge-localized modes (ELMs) on fusion reactors is often attempted with 3D perturbations of the confining magnetic fields. However, the established technique of resonant magnetic perturbations (RMPs) also degrades plasma performance, complicating implementation on future fusion reactors. In this paper, we introduce an adaptive real-time control scheme on the KSTAR tokamak as a viable approach to achieve an ELM-free state and simultaneously recover high-confinement (beta (N) similar to 1.91, beta (p) similar to 1.53, and H (98) similar to 0.9), demonstrating successful handling of a volatile complex system through adaptive measures. We show that, by exploiting a salient hysteresis process to adaptively minimize the RMP strength, stable ELM suppression can be achieved while actively encouraging confinement recovery. This is made possible by a self-organized transport response in the plasma edge which reinforces the confinement improvement through a widening of the ion temperature pedestal and promotes control stability, in contrast to the deteriorating effect on performance observed in standard RMP experiments. These results establish the real-time approach as an up-and-coming solution toward an optimized ELM-free state, which is an important step for the operation of ITER and reactor-grade tokamak plasmas.
Publisher
IOP PUBLISHING LTD
ISSN
0029-5515
Keyword (Author)
ELM suppressionedge pedestalKSTARreal-time feedback controledge localized moderesonant magnetic perturbationconfinement optimization
Keyword
ARBITRARY COLLISIONALITYBOOTSTRAP CURRENTTRANSPORTSTABILITYCODE

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