Statistical model for intermittent plasma edge turbulence

Details Statistical model for intermittent plasma edge turbulence Statistical model for intermittent plasma edge turbulence

2005-05-23

arxiv.org/abs/physics/0505154v1

Physical Review E 72 (2005) 016407

Physics

Plasma Physics

13 pages. Physica Review E, accepted

Scientific paper

10.1103/PhysRevE.72.016407

The Probability Distribution Function of plasma density fluctuations at the edge of fusion devices is known to be skewed and strongly non-Gaussian. The causes of this peculiar behaviour are, up to now, largely unexplored. On the other hand, understanding the origin and the properties of edge turbulence is a key issue in magnetic fusion research. In this work we show that a stochastic fragmentation model, already successfully applied to fluid turbulence, is able to predict an asymmetric distribution that closely matches experimental data. The asymmetry is found to be a direct consequence of intermittency. A discussion of our results in terms of recently suggested BHP universal curve [S.T. Bramwell, P.C.W. Holdsworth, J.-F. Pinton, Nature (London) 396, 552 (1998)], that should hold for strongly correlated and critical systems, is also proposed

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