The different behaviours of deuterium (D) and tritium (T) in the hot spot ofmarginally-igniting cryogenic DT inertial-confinement fusion (ICF) targets areinvestigated with an ion Fokker-Planck model. With respect to an equivalentsingle-species model, a higher density and a higher temperature are found for Tin the stagnation phase of the target implosion. In addition, the stagnatinghot spot is found to be less dense but hotter than in the single-species case.As a result, the fusion reaction yield in the hot spot is significantlyincreased. Fusion neutron diagnostics of the implosion find a larger iontemperature as deduced from DT reactions than from DD reactions, in goodagreement with NIF experimental results. ICF target designs should thusdefinitely take ion-kinetic effects into account.
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