Poloidal rotation measurement in Tore Supra by reflectometry

Reflectometry is a microwave diagnostic widely and exclusively used in tokamaks to measure the density profile or to investigate the core turbulence. In this paper the authors present a new method to measure the rotation velocity by using a Doppler reflectometry, namely oblique and off-axis, where the incident wave is not perpendicular to the cut off layer. In this configuration, the turbulence frequency spectrum obtained by back-scattering is Doppler shifted, and Doppler shift frequency which is proportional to the turbulence poloidal rotation, allows to determine the turbulence rotation velocity. From this measurement, and then using a simple modelling for the turbulence, they can extract the plasma poloidal rotation velocity. Paper published too in 4. reflectometry workshop, 22-24 Mar 1999 in Cadarache (France)