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DC Field | Value | Language |
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dc.citation.number | 9 | - |
dc.citation.startPage | 093009 | - |
dc.citation.title | NUCLEAR FUSION | - |
dc.citation.volume | 54 | - |
dc.contributor.author | Holcomb, C. T. | - |
dc.contributor.author | Ferron, J. R. | - |
dc.contributor.author | Luce, T. C. | - |
dc.contributor.author | Petrie, T. W. | - |
dc.contributor.author | Park, J. M. | - |
dc.contributor.author | Turco, F. | - |
dc.contributor.author | Van Zeeland, M. A. | - |
dc.contributor.author | Okabayashi, M. | - |
dc.contributor.author | Lasnier, C. T. | - |
dc.contributor.author | Hanson, J. M. | - |
dc.contributor.author | Politzter, P. A. | - |
dc.contributor.author | In, Yongkyoon | - |
dc.contributor.author | Hyatt, A. W. | - |
dc.contributor.author | La Haye, R. J. | - |
dc.contributor.author | Lanctot, M. J. | - |
dc.date.accessioned | 2023-12-22T02:11:22Z | - |
dc.date.available | 2023-12-22T02:11:22Z | - |
dc.date.created | 2018-03-05 | - |
dc.date.issued | 2014-09 | - |
dc.description.abstract | On DIII-D (Luxon 2005 Fusion Sci. Technol. 48 828), a high beta scenario with minimum safety factor (q(min)) near 1.4 has been optimized with new tools and shown to be a favourable candidate for long pulse or steady state operation in future devices. The new capability to redirect up to 5 MW of neutral beam injection (NBI) from on- to off-axis improves the ability to sustain elevated q(min) with a less peaked pressure profile. These changes increase the ideal magnetohydrodynamics (MHD) n = 1 mode beta(N) limit thus providing a path forward for increasing the noninductive current drive fraction by operating at high beta(N). Quasi-stationary discharges free of tearing modes have been sustained at beta(N) = 3.5 and beta(T) = 3.6% for two current profile diffusion timescales (about 3 s) limited by neutral beam duration. The discharge performance has normalized fusion performance expected to give fusion gain Q approximate to 5 in a device the size of ITER. Analysis of the poloidal flux evolution and current drive balance show that the loop voltage profile is almost relaxed even with 25% of the current driven inductively, and q(min) remains elevated near 1.4. These observations increase confidence that the current profile will not evolve to one unstable to a tearing mode. In preliminary tests a divertor heat flux reduction technique based on producing a radiating mantle with neon injection appears compatible with this operating scenario. 0D model extrapolations suggest it may be possible to push this scenario up to 100% noninductive current drive by raising beta(N). Similar discharges with q(min) = 1.5-2 were susceptible to tearing modes and off-axis fishbones, and with q(min) > 2 lower normalized global energy confinement time is observed. | - |
dc.identifier.bibliographicCitation | NUCLEAR FUSION, v.54, no.9, pp.093009 | - |
dc.identifier.doi | 10.1088/0029-5515/54/9/093009 | - |
dc.identifier.issn | 0029-5515 | - |
dc.identifier.scopusid | 2-s2.0-84961778245 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/23753 | - |
dc.identifier.url | http://iopscience.iop.org/article/10.1088/0029-5515/54/9/093009/meta | - |
dc.identifier.wosid | 000341966700011 | - |
dc.language | 영어 | - |
dc.publisher | INT ATOMIC ENERGY AGENCY | - |
dc.title | Steady state scenario development with elevated minimum safety factor on DIII-D | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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