DIFFUSION OF BEAM IONS AT THE TOKAMAK FUSION TEST REACTOR

Various DD and DT plasmas are analysed for effects of fast ion transpo rt with a time dependent, 1 1/2-D transport simulation code (TRANSP). The sensitivity of the simulations to fast ion diffusion modelling is tested against numerous parameters. Strong correlations are found with beam power and plasma stored energy. The neutron emission sensitivity is mostly affected by the fraction of beam-beam neutrons. Wall recycl ing is essential in interpreting the results for DT plasmas heated wit h pure deuterium or pure tritium beams. The decay of the 14 MeV neutro n emission following a short DT beam pulse implies a small fast ion di ffusion coefficient (D-f < 0.05 m(2)/s). The agreement of the measured neutron emission and diamagnetic flux with the simulations in DT plas mas heated with various numbers of tritium and deuterium beams, and po wer, implies that D-f less than or equal to 0.2 m(2)/s.