FOKKER-PLANCK 3-D MODELING OF AXISYMMETRICAL COLLISIONAL LOSSES OF FUSION PRODUCTS IN TFTR

The results of a 3-D (in constants of motion space) Fokker-Planck simu lation of the collisional losses of fusion products in axisymmetric DT and DD discharges in TFTR are presented. The distributions of escaped ions over poloidal angle and pitch angle, and their energy spectra, a re obtained. Axisymmetric collisional losses of fusion products are fo und to be less than 2 to 5%. The distribution of confined fusion produ cts is shown to be strongly anisotropic and non-uniform in the radial co-ordinate, mainly for slowed-down fusion products with small longitu dinal energy. A comparison between these modelling results and experim ental data is made.