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DC Field | Value | Language |
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dc.citation.number | 10 | - |
dc.citation.startPage | 102506 | - |
dc.citation.title | PHYSICS OF PLASMAS | - |
dc.citation.volume | 15 | - |
dc.contributor.author | In, Yongkyoon | - |
dc.contributor.author | Kim, J. | - |
dc.contributor.author | Kim, J. S. | - |
dc.contributor.author | Garofalo, A. M. | - |
dc.contributor.author | Jackson, G. L. | - |
dc.contributor.author | La Haye, R. J. | - |
dc.contributor.author | Strait, E. J. | - |
dc.contributor.author | Okabayashi, M. | - |
dc.contributor.author | Reimerdes, H. | - |
dc.date.accessioned | 2023-12-22T08:36:18Z | - |
dc.date.available | 2023-12-22T08:36:18Z | - |
dc.date.created | 2018-03-05 | - |
dc.date.issued | 2008-10 | - |
dc.description.abstract | It is well known in theory that even after the n =1 resistive wall mode (RWM) is suppressed, the other low-n modes, such as n =2 or 3, can appear sequentially, as beta increases. In recent DIII-D experiments [J. L. Luxon, Nucl. Fusion 42, 614 (2002)], we found such an example that supports the theoretical prediction: while the n =1 mode was suppressed, an n =3 mode grew dominant, leading to a beta collapse. The n = 1 RWM suppression was likely due to a combination of rotational stabilization and n = 1 RWM feedback. The multiple RWM identification was performed using an expanded matched filter, where n = 1 and n = 3 RWM basis vectors are simultaneously considered. Taking advantage of the expanded matched filter, we found that an n = 3 mode following an edge-localized-mode burst grew almost linearly for several milliseconds without being hindered. This n = 3 mode appeared responsible for the beta collapse (down to the n = 3 no-wall limit), as well as for a drop in toroidal rotation. A preliminary analysis suggests that the identity of the n= 3 mode could be related to the n = 3 RWM (possibly the first observation in tokamak experiments), while the impact of the n = 3 mode was not as destructive as that of n = 1 RWM. A numerical postprocessing of Mirnov probes showed that the n = 2 mode was also unstable, consistent with the theoretical prediction. In practice, since the presence of an n = 3 mode can interfere with the existing n = 1 RWM identification, multiple low-n mode identification is deemed essential not only to detect n > 1 mode, but also to provide accurate n = 1 RWM identification and feedback control. | - |
dc.identifier.bibliographicCitation | PHYSICS OF PLASMAS, v.15, no.10, pp.102506 | - |
dc.identifier.doi | 10.1063/1.2999526 | - |
dc.identifier.issn | 1070-664X | - |
dc.identifier.scopusid | 2-s2.0-55149114229 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/23777 | - |
dc.identifier.url | http://aip.scitation.org/doi/10.1063/1.2999526 | - |
dc.identifier.wosid | 000260573100030 | - |
dc.language | 영어 | - |
dc.publisher | AMER INST PHYSICS | - |
dc.title | Influences of multiple low-n modes on n=1 resistive wall mode identification and feedback control | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | DIII-D | - |
dc.subject.keywordPlus | PLASMAS | - |
dc.subject.keywordPlus | TOKAMAK | - |
dc.subject.keywordPlus | COILS | - |
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