Hydrogen retention to impurities in tungsten: A multi-scale study

The concept of numerically solving the rate theory equations was used in determining hydrogen retention to carbon, oxygen and argon impurities in bulk tungsten. In the simulations, a hydrogen pulse with low energy and low fluence was subjected to tungsten with varying impurity concentrations. Retention and release of hydrogen atoms from impurities and intrinsic high-energy traps was monitored during and after the pulse. At 500 K the detrapping of hydrogen and diffusion to the W surface was found to take place in long timescales after the pulse shutdown