Experimental investigation of geodesic acoustic modes on JET using Doppler backscattering

TitleExperimental investigation of geodesic acoustic modes on JET using Doppler backscattering
Publication TypeJournal Article
Year of Publication2016
AuthorsC. Silva, J.C Hillesheim, C. Hidalgo, E. Belonohy, E. Delabie, L. Gil, C.F Maggi, L. Meneses, E. Solano, M. Tsalas, JET Contributors
JournalNuclear Fusion
Volume56
Issue10
Pagination106026
Abstract

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  20% larger in deuterium than in hydrogen plasmas.

DOI10.1088/0029-5515/56/10/106026
Division

FP

Department

TP

PID

8113e9a61ed7b2bc7f07a2bc6d859403

Alternate TitleNucl. Fusion

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