Role of nonthermal velocity fluctuations on anomalous impurity heating in the TJ-I tokamak

Measured impurity temperature profiles from linewidths in the TJ-I tokamak are shown to be higher than proton temperature profiles. The difference between both apparent temperatures, which is attributed to the presence of anisotropic nonthermal velocities, tends to decrease as the density increases. Whereas electrostatic drifts due to E${\mathrm{̃}}_{\mathit{I}}$×B might be responsible for the poloidal turbulence velocities, radial velocities might be dominated by magnetic turbulence. These conclusions are supported by criteria based on the radial dependence and typical strengths of electric and magnetic fluctuations.