Charge-exchange recombination spectroscopy (CXRS) has been used to compare results on ion temperatures from several diagnostics at TEXTOR-94. The question of whether the typically measured width of impurity spectral lines is representative for the main ion temperature , is addressed by applying CXRS to the Balmer-alpha spectrum of deuterium. The importance of the halo effect is found not to be severe for the measurements. is lower than the impurity temperatures for low-density discharges with neutral beam heating. The time evolution of and the toroidal rotation were also measured during sawtooth oscillations. From this a lower bound for the ion heat diffusivity of has been deduced.
Investigation into ion edge temperature behaviour using CER spectroscopy at DIII-D