Neutron yield during ICRH and NBI modulation experiments in TEXTOR

In TEXTOR, the time evolution of the neutron emission is measured during discharges where the power amplitude of ICRH or NBI is modulated. By varying the modulation frequency of the additional power in a series of reproducible discharges, we construct the experimental transfer function (i.e. amplitude and phase versus the frequency) of the neutron yield versus the additional heating power. From the measured transfer function, we determine the different characteristic times: 16 ms and 1 ms during ICRH and 60 ms during NBI modulation. In section 1, the neutron production mechanisms relevant to our experiments are recalled. In section 2 and 3, the relations between the measured characteristic times and the slowing down and confinement times are explained. (author) 8 refs., 2 figs