Measurement and Qualitative Interpretation of the Radial Scale of Turbulence in JET Plasmas

Turbulence generally dominates transport in tokamak plasmas. It is believed to play a central role in the formation of Internal Transport Barriers (ITBs) and the edge transport barrier through the reduction of anomalous transport by sheared poloidal flow. In JET, there is ongoing work on the influence of rotational shear on ITB dynamics, and recent studies on the radial electric field indicate that its increase does not necessarily precede the L-H transition. The experimental characterization of turbulence in JET is thus necessary to, for instance, complement such flow shear studies and contribute to the understanding of ITB and H-mode physics.
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