Fluctuations, sheared radial electric fields and transport interplay in fusion plasmas

Physics

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Scientific paper

A view of recent experimental results and progress in the characterization of plasma turbulence in magnetically confined devices is given. An empirical similarity in the scaling properties of the probability distribution function of turbulent transport has been observed in the plasma edge region. This result supports the view that turbulent transport displays universality in fusion plasmas and emphasizes the importance of the statistical description of transport processes in fusion plasmas as an alternative approach to the traditional way of characterizing transport based on the computation of effective transport coefficients. Comparative studies in different magnetically confined plasmas show that fluctuations and sheared poloidal flows organize themselves to be close to marginal stability. This property should be considered as a critical test for improved confinement transition models. Magnetic configuration scan experiments in stellarator devices have shown a complex interplay between transport and sheared radial electric fields in the proximity of rational surfaces. The development of new fluctuation analysis techniques based on the investigation of velocity fluctuations opens a new way to investigate turbulent transport and dynamical electric fields in the plasma core region.

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