Abstract
Neutron-irradiated tungsten (W) samples were exposed to helium (He)–seeded deuterium (D) plasmas using a linear plasma device called Tritium Plasma Experiment in order to investigate the synergetic effects of neutron and He irradiations on D retention in W. Exposure to nonseeded D plasma was also performed for neutron-irradiated and nonirradiated W samples for comparison. Deuterium retention in neutron-irradiated W after D plasma exposure was two to three times larger than that in W without neutron irradiation. Nevertheless, He seeding in D plasma resulted in a drastic reduction in D retention. The cross-sectional observation by transmission microscopy showed formation of He bubble layers with a thickness of 10 to 20 nm. There is a possibility that alpha particles in fusion plasma reduce tritium retention in neutron-irradiated plasma-facing components with W layers.
| Original language | American English |
|---|---|
| Pages (from-to) | 76-79 |
| Number of pages | 4 |
| Journal | Fusion Science and Technology |
| Volume | 77 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2021 |
Keywords
- helium bubble
- hydrogen isotope retention
- neutron irradiation
- tungsten
EGS Disciplines
- Materials Science and Engineering