Based on a recent theory for fast-ion redistribution during sawtooth crashes, an approximate analytical model is given for describing the sawtooth induced changes in the emission profile of 14 MeV neutrons generated by triton burn-up. Comparison with measurements of sawtooth-induced neutron emission profile broadening on JET shows good agreement, which indicates that the theory for fast-ion redistribution is consistent with the experimental results.
Fast-ion transport in the presence of magnetic reconnection induced by sawtooth oscillations in ASDEX Upgrade