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DC Field | Value | Language |
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dc.citation.number | 8 | - |
dc.citation.startPage | 086066 | - |
dc.citation.title | NUCLEAR FUSION | - |
dc.citation.volume | 64 | - |
dc.contributor.author | Choi, Inhwan | - |
dc.contributor.author | Liu, Yueqiang | - |
dc.contributor.author | In, Yongkyoon | - |
dc.date.accessioned | 2024-09-09T12:05:07Z | - |
dc.date.available | 2024-09-09T12:05:07Z | - |
dc.date.created | 2024-08-05 | - |
dc.date.issued | 2024-08 | - |
dc.description.abstract | Recent edge-localized modes (ELM) control experiments via resonant magnetic perturbation (RMP) in KSTAR have shown a strong up/down poloidal asymmetric coupling dependence. Specifically, in lower single null (LSN) plasmas at q95 greater than or similar to 5, the lower two-row (middle/bottom) RMPs among ITER-like three-row (top/middle/bottom) in-vessel control coils (IVCC) in KSTAR were more effective in suppressing ELM-crashes than the upper two-row (top/middle) RMPs. In contrast, at q 95 similar to 4, the upper two-row RMPs turned out to be more effective than the lower counterpart. Since the ITER baseline scenario is planned to operate at q 95 similar to 3, the understanding of the origin of such up/down poloidal asymmetric coupling dependence, as well as the prediction about ITER-relevant conditions at a lower q 95, would be quite important and potentially impactful to the RMP ELM control in ITER. A linear, resistive, single-fluid MHD code MARS-F has been utilized to address and model the up/down poloidal asymmetric RMP coupling dependence. Specifically, based on two contrasting exemplary discharges with up/down poloidal (i) asymmetric at q 95 similar to 4 and (ii) symmetric behavior at q 95 similar to 5, among tens of otherwise similar discharges, a systematic MARS-F modeling has been thoroughly conducted. As a result, the plasma response investigation suggests that the X-point displacement (xi X), rather than any other figures of merit, would be a directly relevant metric for the up/down poloidal asymmetric coupling in RMP-driven, ELM-crash suppression in KSTAR. Based on a sensitivity study of the edge safety factor in MARS-F modeling, the xi X variation follows the same quantitative trend as observed in experiments. However, no or little plasma pressure dependence has been found, though xi X increases with plasma pressure. At the ITER-relevant low q 95 similar to 3 in a scaled KSTAR equilibrium, such modeling predicts the upper two-row RMPs would be more favorable in suppressing the ELM-crashes than the lower counterpart. | - |
dc.identifier.bibliographicCitation | NUCLEAR FUSION, v.64, no.8, pp.086066 | - |
dc.identifier.doi | 10.1088/1741-4326/ad5e93 | - |
dc.identifier.issn | 0029-5515 | - |
dc.identifier.scopusid | 2-s2.0-85198900942 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/83707 | - |
dc.identifier.wosid | 001270966400001 | - |
dc.language | 영어 | - |
dc.publisher | IOP Publishing Ltd | - |
dc.title | Origin of the up/down poloidal asymmetric dependence of ELM control in ITER-like RMP configuration in KSTAR | - |
dc.type | Article | - |
dc.description.isOpenAccess | TRUE | - |
dc.relation.journalWebOfScienceCategory | Physics, Fluids & Plasmas | - |
dc.relation.journalResearchArea | Physics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | RMP-driven ELM-crash-suppression | - |
dc.subject.keywordAuthor | KSTAR | - |
dc.subject.keywordAuthor | edge-localized-modes (ELM) | - |
dc.subject.keywordAuthor | resonant magnetic perturbation (RMP) | - |
dc.subject.keywordAuthor | up/down poloidal asymmetric dependence | - |
dc.subject.keywordPlus | MODES | - |
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