Retention and recycling of plasma-edge hydrogen isotopes in C and TiC

The retention, release, and isotopic exchange of hydrogen, deuterium, and tritium incident on room temperature C and TiC with Maxwellian velocity and isotropic angular distributions have been calculated using the Local Mixing Model. The calculations are based on the hydrogen saturation concentration, range distributions and isotopic exchange behavior, all of which have been verified experimentally by monoenergetic implants. Particle fluences (1016 to 1020/cm2) and characteristic Maxwellian energies (50 eV to 3200 eV) were chosen in the range of interest for tokamak plasma edge conditions. The results of these calculations can be used to estimate tritium inventory buildup and to predict tritium changeout rates by isotopic exchange as a function of plasma edge conditions