A spectroscopic investigation of turbulence in magnetized plasmas Y. Marandet a, * ,H.Capes b , L. Godbert-Mouret a , R. Guirlet b , M. Koubiti a ,R.Stamm a a PIIM, Universit e de Provence, Centre de St-J er^ ome, F13397 Marseille, France b DRFC-CEA, 13108 Saint Paul lez Durance Cedex, France Abstract WepresentaspectroscopicinvestigationofturbulenceintheTore-Supraedgeplasma,wheredeuterium spectral lines are found to exhibit a power-law behavior in their wings. Such a feature is not predicted by theequilibriumlinebroadeningtheoryintheconditionsoftheedgeplasma,wherethethermalStarkeffect is negligible. Therefore, the possible role of turbulence is investigated along two separate paths. Indeed, both the Stark and the Doppler profiles may differ significantly from the equilibrium profiles. Ó 2003 Elsevier B.V. All rights reserved. PACS: 32.70.Jz; 05.40.Fb Keywords: Spectroscopy; Line wings; Plasma turbulence; Probability distribution function; L evy flights 1. Introduction Understanding turbulence in magnetized plasmas is a challenging theoretical issue closely re- lated to the feasibility of magnetic confinement fusion. Turbulence is indeed held responsible for the so-called anomalous transport which degrades the quality of the confinement in fusion de- vices.Therefore,thetopichasattractedmuchattentionduringtherecentyears,andthemodelling of turbulence has achieved important progresses [1–3]. In particular, numerical simulations have brought valuable new results concerning turbulent transport. Large scale structures, like con- vective cells and their limiting cases, zonal flows and streamers, are observed [2]. Streamers, to- gether with avalanches and fronts, are mechanisms underlying large-scale transport events. * Corresponding author. E-mail address: marandet@piima1.univ-mrs.fr (Y. Marandet). 1007-5704/03/$ - see front matter Ó 2003 Elsevier B.V. All rights reserved. doi:10.1016/S1007-5704(03)00041-8 Communications in Nonlinear Science and Numerical Simulation 8 (2003) 469–475 www.elsevier.com/locate/cnsns