The t(d,n)α and d(d,n)³He neutron emissivity profiles are measured in a deuterium neutral-beam--heated plasma where a small amount of tritium (T) gas has been puffed. The tritium density is inferred from the neutron emissivities, and transport coefficients ( $D,V$) are determined. The particle diffusivities of T and ⁴He and the thermal diffusivity are similar in magnitude and profile shape. The convective velocity is small for $r/a<0.6$, and is anomalous for $r/a>0.6$. These are the first measurements of D and V for a hydrogen isotope in a tokamak plasma.
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Efthimion et al. (1995) studied this question.
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