The program objective is to advance the materials science base for the development of innovative materials and fabrication methods that will establish the technological viability of fusion energy and enable improved performance, enhanced safety, and reduced overall fusion system costs so as to permit fusion to reach its full potential.
Displacement cascade simulations using molecular dynamics highlight similarities of fission and fusion irradiation environments:
- DT fusion neutrons produce atomic recoils at much higher energies than fission neutrons
- Use of large-scale atomic simulations demonstrates that subcascade formation minimizes differences in defect production
- Subcascades from 50 keV event (ave. from 2.3 MeV neutron) are similar to a single 10 keV event (ave. from 0.4 MeV neutron)
- Average defect production per unit cascade energy is essentially the same for fission and fusion
- However, differences between fusion and fission irradiation are expected at high dose due to fusion’s higher transmutant He and H production