| First evidence of the role of zonal flows for the L-h transition at marginal input power in the East tokamak. | |
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MedLine Citation:
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PMID: 22026773 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A quasiperiodic Er oscillation at a frequency of <4 kHz, much lower than the geodesic-acoustic-mode frequency, with a modulation in edge turbulence preceding and following the low-to-high (L-H) confinement mode transition, has been observed for the first time in the EAST tokamak, using two toroidally separated reciprocating probes. Just prior to the L-H transition, the Er oscillation often evolves into intermittent negative Er spikes. The low-frequency Er oscillation, as well as the Er spikes, is strongly correlated with the turbulence-driven Reynolds stress, thus providing first evidence of the role of the zonal flows in the L-H transition at marginal input power. These new findings not only shed light on the underlying physics mechanism for the L-H transition, but also have significant implications for ITER operations close to the L-H transition threshold power. |
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Authors:
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G S Xu; B N Wan; H Q Wang; H Y Guo; H L Zhao; A D Liu; V Naulin; P H Diamond; G R Tynan; M Xu; R Chen; M Jiang; P Liu; N Yan; W Zhang; L Wang; S C Liu; S Y Ding |
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Publication Detail:
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Type: Journal Article Date: 2011-09-14 |
Journal Detail:
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Title: Physical review letters Volume: 107 ISSN: 1079-7114 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-10-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 125001 Citation Subset: IM |
Affiliation:
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Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China. |
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