DC Field | Value | Language |
---|---|---|
dc.contributor.author | YUN, GUNSU | - |
dc.contributor.author | OH, YOUNG MIN | - |
dc.contributor.author | LEE, Jieun | - |
dc.contributor.author | Hwang, Hyung Joo | - |
dc.contributor.author | LEE, Jaehyun | - |
dc.contributor.author | Leconte, Michael | - |
dc.date.accessioned | 2018-05-23T09:21:44Z | - |
dc.date.available | 2018-05-23T09:21:44Z | - |
dc.date.created | 2017-11-24 | - |
dc.date.issued | 2017-10-23 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/45745 | - |
dc.description.abstract | The boundary of high-temperature plasma confined by a toroidal magnetic field structure often undergoes quasi-periodic relaxation oscillations between high and low energy states. On the KSTAR tokamak, the oscillation cycle consists of a long quasi-steady state characterized by eigenmode-like filamentary modes, an abrupt transition into non-modal filamentary structure [Lee JE, {\it Sci. Rep.} 7, 45075], and its rapid burst (via magnetic reconnection) leading to the boundary collapse. A phenomenological model including the effects of time-varying perpendicular flow shear, turbulent transport, and external heating has been developed to understand the nonlinear oscillation. The model, which has the form of a generalized complex Ginzburg-Landau equation, shows that the flow shear amplitude and the shear layer width determine the nonlinear oscillation. Numerical solutions revealed that there exists a critical flow shear level below which steady states can exist. This result suggests that the abrupt transition to the non-modal unstable state is due to the flow shear increasing above the critical level. The model predicts that high wavenumber (k) modes can coexist with low-k modes at sufficiently low level of flow shear [Lee J, {\it Phys. Rev. Lett.} 117, 075001]. | - |
dc.language | English | - |
dc.publisher | American Physical Society | - |
dc.relation.isPartOf | 59th Annual Meeting of the APS Division of Plasma Physics | - |
dc.relation.isPartOf | Bulletin of the American Physical Society | - |
dc.title | A generalized Ginzburg-Landau model for nonlinear relaxation oscillation of magnetized plasma boundary with shear flow | - |
dc.type | Conference | - |
dc.type.rims | CONF | - |
dc.identifier.bibliographicCitation | 59th Annual Meeting of the APS Division of Plasma Physics, pp.CP11 - 00126 | - |
dc.citation.conferenceDate | 2017-10-23 | - |
dc.citation.conferencePlace | US | - |
dc.citation.conferencePlace | Wisconsin Center | - |
dc.citation.endPage | 00126 | - |
dc.citation.startPage | CP11 | - |
dc.citation.title | 59th Annual Meeting of the APS Division of Plasma Physics | - |
dc.contributor.affiliatedAuthor | YUN, GUNSU | - |
dc.contributor.affiliatedAuthor | OH, YOUNG MIN | - |
dc.contributor.affiliatedAuthor | LEE, Jieun | - |
dc.contributor.affiliatedAuthor | Hwang, Hyung Joo | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
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