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HILLESHEIM , J.c.

Last name: HILLESHEIM

First name: J.c.

August 27, 2020 (v1)

Publication

Metadata-only

Experimental investigation of geodesic acoustic modes on JET using Doppler backscattering

Silva, C. Hillesheim, J.C. Hidalgo, C.

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...

Uploaded on: December 4, 2022
August 27, 2020 (v1)

Publication

Metadata-only

Stationary Zonal Flows during the Formation of the Edge Transport Barrier in the JET Tokamak

Hillesheim, J.C. Delabie, E. Meyer, H.

High spatial resolution Doppler backscattering measurements in JET have enabled new insights into the development of the edge Er. We observe fine-scale spatial structures in the edge Er well with a wave number krρi ≈ 0.4–0.8, consistent with stationary zonal flows, the characteristics of which vary with density. The zonal flow amplitude and...

Uploaded on: March 26, 2023