Deuterium retention in tungsten and tungsten alloys exposed to pure and impurities seeding deuterium plasma

Abstract

Polycrystalline tungsten (W) and four kinds of tungsten alloys were exposed to pure and impurities seeding deuterium (D) plasma to investigate the deuterium retention behaviour. The results show that D retention in W increases with the increasing fluence and incident energy, and decreases with the increase of temperature. The doping of alloying element and compounds, such as Re, La2O3, and ZrC, suppress the D retention at lower fluence but has limited effect at fluence above 2.6 × 1025 D/m2, and D inventory in these W alloys is higher than in W at temperature of 800 K. Helium (He) and nitrogen (N) impurities seeding significantly reduce D retention in tungsten. And higher N content in plasma causes more obvious reduction of D inventory. But the argon (Ar) impurity seeding leads to the increase of D retention.