Modelling of hydrogen isotope inventory in mixed materials including porous deposited layers in fusion devices

Abstract

Abstract.Hydrogen isotopes inventory (HII) is a key issue for fusion devices like ITER. Simultaneous use of Be, W and C as the wall material for different parts of plasmafacing components (PFCs) will bring in material mixing issues, which compound that of hydrogen isotopes retention. To simulate the hydrogen inventory in the PFCs, we have developed a flexible standalone model called HIIPC (Hydrogen Isotope Inventory Processes Code). The particle balance based model for reaction-diffusion and HII in metal and porous media (mainly carbon and co-deposited layer) is presented, coupled with a heating model which can calculate the temperature distribution. Some sample results are given to illustrate the model's capabilities and show good qualitative agreement with experiment.

Estimation of the tritium retention in ITER tungsten divertor target using macroscopic rate equations simulations

“…from the plasma facing surface to the cooled surface. This is done with a simple 1D thermal diffusion model added to MHIMS that is similar to the one presented by Sang et al [17] from which we took the numerical values of the thermal properties of W.…”

Macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials

“…In the present work, a code based on a rate equations model has been developed to deal with the trapping of HIs in W. It is named MHIMS (Migration of Hydrogen Isotopes in MaterialS) [12] and it can be seen as a light version of the HIIPC models developed by Sang et al. [13] for tokamaks inventory simulations. In addition to the reasonable computational resources necessary for running MHIMS, we will detail here how MHIMS is a good tool to extract, from laboratory experiments, fundamental parameters of the HIstungsten interaction and how it can be used for experimentally relevant predictions.…”

“…In the following, 0 is taken equal to 10 13 s -1 accordingly with [7,10]. In [8,9], 0 is expressed as a function of the lattice constant and of the diffusion coefficient and 0 ~ 3×10 13 s -1 for hydrogen and ν0 ~ 2×10 13 , where λ is the distance between 2 solute sites or between a solute and a trap site. So the trapping source term (5) becomes:…”

Multidimensional finite-element simulations of the diffusion and trapping of hydrogen in plasma-facing components including thermal expansion

“…Understanding the diffusion and trapping of hydrogen isotopes (HI) in plasma facing components (PFC) is an important issue for future fusion device operations. For such a purpose, specific macroscopic rate equations (MRE) codes [1][2][3] were developed to solve both diffusion and full kinetic trapping of HI in metals, using the McNabb and Foster equation [4]. Numerical simulations based on these codes have shown the important role played by temperature on HI inventory and permeation, so that a particular attention must be paid to the determination of the thermal field, especially for 2D geometries [5].…”