On the statistics of edge fluctuations: comparative study between various fusion devices

Abstract

In this paper we present a statistical study of edge fluctuations taken with the Gas Puffing Imaging (GPI) diagnostics. We carry out a comparison of GPI signal from an extensive database including four devices (two Tokamaks and two Reversed Field Pinches). The data are analyzed in terms of their statistical moments Skewness and Kurtosis, as done in [B. Labit, et al, Phys. Rev. Lett. \textbf{98}, 255002 (2007)]. The data align along parabolic curves, although different from machine to machine, with some spread around the best-fitting curve. A discussion about the meaning of the parabolic trend as well as the departure of real data from it is provided. A phenomenological model is finally provided, attempting to accomodate experimental evidence.

To appear in Plasma Physics and Controlled Fusion

References in corpus (2)

• On the Probability distribution function of particle density at the edge of fusion devices
• Statistical features of edge turbulence in RFX-mod from Gas Puffing Imaging

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