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Stationary Zonal Flows during the Formation of the Edge Transport Barrier in the JET Tokamak
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 11112016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 6, article id 065002Article in journal (Refereed) Published
Abstract [en]

High spatial resolution Doppler backscattering measurements in JET have enabled new insights into the development of the edge E-r. We observe fine-scale spatial structures in the edge E-r well with a wave number k(r rho i) approximate to 0.4-0.8, consistent with stationary zonal flows, the characteristics of which vary with density. The zonal flow amplitude and wavelength both decrease with local collisionality, such that the zonal flow E x B shear increases. Above the minimum of the L-H transition power threshold dependence on density, the zonal flows are present during L mode and disappear following the H-mode transition, while below the minimum they are reduced below measurable amplitude during L mode, before the L-H transition.

Place, publisher, year, edition, pages
2016. Vol. 116, no 6, article id 065002
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Subatomic Physics
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URN: urn:nbn:se:uu:diva-400246DOI: 10.1103/PhysRevLett.116.065002ISI: 000369740300012PubMedID: 26918997OAI: oai:DiVA.org:uu-400246DiVA, id: diva2:1383158
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.116.065002

Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07Bibliographically approved

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