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Experimental investigation of geodesic acoustic modes on JET using Doppler backscattering
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: 11152016 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 56, no 10, article id 106026Article in journal (Refereed) Published
Abstract [en]

Geodesic acoustic modes (GAMs) have been investigated in JET ohmic discharges using mainly Doppler backscattering. Characteristics and scaling properties of the GAM are studied. Time and spatial resolved measurements of the perpendicular velocity indicate that GAMs are located in a narrow layer at the edge density gradient region with amplitude corresponding to about 50% of the mean local perpendicular velocity. GAMs on JET appear to be regulated by the turbulence drive rather than by their damping rate. It is also shown that the GAM amplitude is similar to 20% larger in deuterium than in hydrogen plasmas.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2016. Vol. 56, no 10, article id 106026
Keywords [en]
edge turbulence, GAMs, Doppler backscattering
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-400361DOI: 10.1088/0029-5515/56/10/106026ISI: 000383953000030OAI: oai:DiVA.org:uu-400361DiVA, id: diva2:1381366
Note

For complete list of authors see http://dx.doi.org/10.1088/0029-5515/56/10/106026

Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved

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Andersson Sundén, ErikBinda, FedericoCecconello, MarcoConroy, SeanDzysiuk, NataliiaEricsson, GöranEriksson, JacobHellesen, CarlHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikSkiba, MateuszWeiszflog, Matthias
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