MEASUREMENTS OF THE TANGENTIAL ION VELOCITY DURING UNBALANCED NEUTRALINJECTION IN THE TFTR

The results of measurements of tangential and transverse (with respect to the current axis) neutron spectra during deuterium-tritium experim ents carried out in the TFTR tokamak in 1997 are presented. The spectr a are measured by using three natural-diamond neutron spectrometers. T he energy resolution of the spectrometers (about 2-3%) provides measur ements of both the spectrum broadening and the shift of the maximum of the energy distribution of tangential neutrons during the unbalanced injection of neutrals. The analysis of the measured spectra based on a semianalytical model allows the determination of the average tangenti al and transverse energies of the beam ions in an anisotropic TFTR pla sma.