Experimental investigation of geodesic acoustic modes on JET using Doppler backscattering

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 t...

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Published in:Nuclear fusion 2016-10, Vol.56 (10), p.106026
Main Authors: Silva, C., Hillesheim, J.C., Hidalgo, C., Belonohy, E., Delabie, E., Gil, L., Maggi, C.F., Meneses, L., Solano, E., Tsalas, M.
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Language:English
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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Doppler backscattering
edge turbulence
GAMs
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cited_by cdi_FETCH-LOGICAL-c546t-6bb26f0bdbc9c99ecf0bd13fc3d8e887182d474efeda0703da7da610c8ec4453
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container_issue 10
container_start_page 106026
container_title Nuclear fusion
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creator Silva, C.
Hillesheim, J.C.
Hidalgo, C.
Belonohy, E.
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Solano, E.
Tsalas, M.
description 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.
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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Doppler backscattering
edge turbulence
GAMs
title Experimental investigation of geodesic acoustic modes on JET using Doppler backscattering
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