Enhanced small scale turbulence oscillations correlated to sawtooth relaxations in the textor tokamak

Abstract

A periodic enhancement of the microturbulence level by sawtooth relaxations has been detected by CO$_{2}$ laser forward scattering in the TEXTOR tokamak. This feature is reproduced quantitatively by a heat transport code in which the anomalous electron transport coefficient is calculated self consistently following a theoretical model of the saturation of the dissipative trapped electron instability. The code also predicts a strong modulation of the heat whole plasma and a strong "profile consistency" as continuous temperature measurements have interpretation of these results is given. Calculated global plasma parameters, such as the energy confinement time and the loop voltage, are in good agreement with the measured values