Fast sweeping reflectometry upgrade on Tore Supra.

In order to study the temporal dynamics of turbulence, the sweep time of our reflectometry has been shortened from 20 to 2 mu s with 1 mu s dead time. Detailed technical aspects of the upgrade are given, namely, about the stability of the ramp generation, the detection setup, and the fast acquisition module. A review of studies (velocity measurement of the turbulence, modifications of the wavenumber spectrum, radial mapping of correlation time, etc.) offered by such improvements is presented. (C) 2010 American Institute of Physics. [doi:10.1063/1.3460624]