Neutron yield during ICRH and NBI modulation experiments in TEXTOR
The time evolution of the neutron emission in TEXTOR has been measured during discharges where the power amplitude of ICRH or NBI is modulated. The experimental transfer function, representing the variation of amplitude and phase with frequency, is measured against the additional heating power. The characteristic times are 16 ms and 1 ms during ICRH and 60 ms during NBI modulation. After a summary of the relevant neutron production mechanisms, the relationship between the measured characteristic times and the slowing down and confinement times is discussed. During ICRH, the evolution of the neutron yield reflects the time evolution of the ion temperature. During NBI, it is governed by the time evolution of the beam distribution function. A theoretical study explains why the experimental values of the characteristic times are seven times smaller than the slowing down times.
Bibliographic Reference: Article: 18th European Conference on Controlled Fusion and Plasma Physics, Vol. III (1991) pp. 377-380
Record Number: 199111424 / Last updated on: 1994-12-02
Original language: en
Available languages: en