Influence of radial diffusion on triton burnup

An analytical investigation of the effect of radial diffusion on the burnup of fusion produced 1 MeV tritons in hot deuterium plasmas is presented. A simple and useful expression is obtained for the anomalous burnup ratio, defined as the burnup fraction with radial diffusion effects to that without radial diffusion effects. When applied to recent experimental results from JET and TFTR showing anomalously reduced burnup, a diffusion constant of 0.1-0.3 m2/s is inferred for the high energy tritons.