Ferritic/Martensitic (F/M) steels have become the lead material for a number of applications in extreme neutron and ion irradiation environments due to their robust resistance to irradiation effects and, in some cases, low activation. In the range from ~400 to 650°C, these materials exhibit low or no swelling in fission irradiation environments while maintaining excellent mechanical...
Among the PIE results of samples irradiated in STIP, the results of hydrogen and its isotopes release measurements are very interesting but less understood. Unlike helium, the actual hydrogen concentration of an irradiated specimen cannot be well predicted without measurement, as it strongly depends on the irradiation temperature and the irradiation environment of the specimens. In most cases,...
Nuclear-grade graphite is often used as target materials in a particle accelerator; it is also used as moderator and structural materials in nuclear fission reactor cores in the UK as well as in some GenIV reactor designs. This work will provide an overview of the types of graphite materials used in these applications and will detail the differences in their microstructure and...
High-Entropy Alloys are a class of novel material that can offer improved resistance to beam-induced radiation damage and thermal shock. Development of these new alloys to serve as beam windows in multi-megawatt accelerator target applications is ongoing at Fermilab. Currently we are investigating AlCoCrMnTiV alloy systems of 4-6 components for service as beam windows; these compositions are...
The Facility for Rare Isotope Beams (FRIB) is a scientific user facility for nuclear science. FRIB’s superconducting radio frequency (SRF) linear heavy-ion accelerator can accelerate all the ions up to uranium to energies above 200 MeV/u. The design beam power is 400 kW, which, once achieved, will extend the heavy-ion accelerator power frontier by more than one order of magnitude. FRIB...
Tungsten is used as a proton-accelerator-target material. However, a significant amount of helium is produced through spallation process under high-energy proton irradiation, compared to nuclear fission and fusion materials. The produced helium forms bubbles at grain boundaries with increasing temperature, leading to fatal embrittlement of the material. Recently, it has been reported that...
