Interaction of Hydrogen Isotopes with Radiation Damaged Tungsten

Numerical analysis of deuterium migration behaviors in tungsten damaged by fast neutron by means of gas absorption method

“…Hydrogen solubility and diffusivity in tungsten were investigated widely, and a low tritium inventory in tungsten wall was expected. However, the experimental research performed in the framework of the US-Japan joint research project PHENIX and TITAN showed a significant increase of hydrogen isotope retention in neutron irradiated tungsten [7][8][9][10]. Also, the desorption temperature of hydrogen isotopes shifted toward high temperature.…”

Comparison of deuterium retention in tungsten exposed to deuterium plasma and gas

“…The retention of hydrogen isotopes in W is mainly affected by trap sites, such as dislocations, grain boundaries, vacancies and microvoids in the matrix material [7][8][9][10] .…”

“…A single vacancy can trap multi-D atoms, so can voids and bubbles. The detrapping energies of D in vacancies are largely scattered, reported to be 1.0~2.2 eV [7,[9][10][11][14][15][16] . For example, the lower temperature desorption peaks (500-650 K) likely represent single vacancies with a trap energy of 1.0-1.6 eV [11] , while the high-temperature desorption peaks (~900 K) are likely associated with the formation of microvoids or vacancy clusters in W with a trap energy of 1.7∼2.2 eV [9] [11, 14,16] .…”