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DC Field | Value | Language |
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dc.citation.number | 1 | - |
dc.citation.startPage | 016026 | - |
dc.citation.title | NUCLEAR FUSION | - |
dc.citation.volume | 58 | - |
dc.contributor.author | Aydemir, A. Y. | - |
dc.contributor.author | Park, B. H. | - |
dc.contributor.author | In, Yongkyoon | - |
dc.date.accessioned | 2023-12-21T21:13:23Z | - |
dc.date.available | 2023-12-21T21:13:23Z | - |
dc.date.created | 2018-03-05 | - |
dc.date.issued | 2018-01 | - |
dc.description.abstract | Some low-n kink-ballooning modes not far from marginal stability are shown to exhibit a bifurcation between two very distinct nonlinear paths that depends sensitively on the background transport levels and linear perturbation amplitudes. The particular instability studied in this work is an n = 1 mode dominated by an m/n = 2/1 component. It is driven by a large pressure gradient in weak magnetic shear and can appear in various high-beta, hybrid/advanced scenarios. Here it is investigated in reversed shear equilibria where the region around the safety-factor minimum provides the low-shear conditions necessary for instability. For a certain range of parameters, a relatively benign path results in a saturated 'long-lived mode' (LLM) that causes little confinement degradation. At the other extreme, the quadrupole geometry of the 2/1 perturbed pressure field evolves into a ballooning finger that subsequently transitions from exponential to explosive growth. The finger eventually leads to a fast disruption with precursors too short for any mitigation effort. Interestingly, the saturated LLM state is found to be metastable; it also can be driven explosively unstable by finiteamplitude perturbations. Similarities to some high-beta disruptions in reversed-shear discharges are discussed. | - |
dc.identifier.bibliographicCitation | NUCLEAR FUSION, v.58, no.1, pp.016026 | - |
dc.identifier.doi | 10.1088/1741-4326/aa95c9 | - |
dc.identifier.issn | 0029-5515 | - |
dc.identifier.scopusid | 2-s2.0-85038623234 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/23742 | - |
dc.identifier.url | http://iopscience.iop.org/article/10.1088/1741-4326/aa95c9/meta | - |
dc.identifier.wosid | 000415847300001 | - |
dc.language | 영어 | - |
dc.publisher | IOP PUBLISHING LTD | - |
dc.title | Dynamics of an n=1 explosive instability and its role in high-beta disruptions | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | disruptions | - |
dc.subject.keywordAuthor | MHD instablities | - |
dc.subject.keywordAuthor | explosive instabilities | - |
dc.subject.keywordAuthor | high-beta | - |
dc.subject.keywordAuthor | bifurcations | - |
dc.subject.keywordAuthor | metastability | - |
dc.subject.keywordPlus | MAGNETOHYDRODYNAMIC MODES DRIVEN | - |
dc.subject.keywordPlus | NEOCLASSICAL TEARING MODES | - |
dc.subject.keywordPlus | FUSION-TEST-REACTOR | - |
dc.subject.keywordPlus | LOW-SHEAR TOKAMAKS | - |
dc.subject.keywordPlus | DIII-D TOKAMAK | - |
dc.subject.keywordPlus | HYDROMAGNETIC-STABILITY | - |
dc.subject.keywordPlus | SAWTOOTH CRASHES | - |
dc.subject.keywordPlus | INFERNAL MODES | - |
dc.subject.keywordPlus | MHD STABILITY | - |
dc.subject.keywordPlus | STABILIZATION | - |
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