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

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

2009-02-12

arxiv.org/abs/0902.2052v1

Plasma Physics and Controlled Fusion 51 (2009) 055013

Physics

Plasma Physics

To appear in Plasma Physics and Controlled Fusion

Scientific paper

10.1088/0741-3335/51/5/055013

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.

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