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Up to now, turbulent processes in fusion plasmas are not clearly identified, then innovative and comprehensible diagnostic measurements are required. Fast-sweep heterodyne reflectometry is always suitable for precise measurement of density profiles but can also be used to reconstruct fluctuation density profiles. A closed-loop upgrade of the method developed in [1] , based on comparisons between simulated and experimental reflected signals, allows us to extract from shot to shot on Tore Supra tokamak the density fluctuations radial wavenumber spectra S(kr) from the fluctuating phase signal of the X-mode fast-sweep V and W band reflectometers. In this paper we focus on the application of this experimental method of extracting the spatial evolution of the wavenumber spectra and radial density fluctuation profiles of the Tore Supra tokamak plasma. Then we exhibit a density fluctuations scaling with the electronic density gradient length Lne .

Density Fluctuations Measurements on Tore Supra Tokamak Plasma: Radial Profiles and Spectra