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In low frequency turbulent plasmas, the profile of a Doppler broadened line shape is linked to an effective velocity distribution function (VDF) of the emitters. This distribution is obtained through both a spatial and time average of the local velocity distribution. We study the case of the Balmer a line of deuterium (D alpha), in typical conditions encountered in ionising edge plasmas (N(e) = 10{18}�10{19}m{-3} and T(e)-T(i) = 10�100eV). We focus this analysis on ion temperature fluctuations, and assume that the acquisition time of the spectrometer is much larger than the typical turbulent time scale. The resulting expression of the effective VDF involves the temperature probability distribution function (PDF). Temperature fluctuations are found to strongly affect the tails of the effective VDF (i.e. line wings), especially when their PDF has a heavy tail. This opens the way for a new spectroscopic analysis of edge plasma turbulence.

Additional information

Authors: MARANDET Y, PIIM-UMR 6633 CNRS/Université de Provence, Marseille (FR);GODBERT-MOURET L, PIIM-UMR 6633 CNRS/Université de Provence, Marseille (FR);KOUBITI M, PIIM-UMR 6633 CNRS/Université de Provence, Marseille (FR);STAMM R, PIIM-UMR 6633 CNRS/Université de Provence, Marseille (FR);CAPES H, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Journal of Nuclear Materials 337-339 (2005) 1092-1095
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