| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Thermal Gradient Effect on the Helium and Intrinsic Defects Transport Properties in Tungsten |
| Author(s) |
Enrique Martinez Saez, Dimitrios Maroudas, Danny Perez, Nithin Mathew, Brian Wirth |
| On-Site Speaker (Planned) |
Enrique Martinez Saez |
| Abstract Scope |
Materials in a fusion reactor are expected to withstand stringent conditions, with high heat and particle fluxes that will create strong gradients of temperature and concentration of diverse species. Defects and He migrate in the presence of the afore-mentioned gradients. We use nonequilibrium molecular dynamics to study the transport properties of He, and self-interstitials in the presence of a thermal gradient in W. We observe that in all cases, the defects and impurity atoms tend to reside in the hot regions of the system. The concentration profile results in an exponential distribution, in agreement with irreversible thermodynamics. We compute the heat of transport for each species resulting in negative terms, indicating that the mass flux is opposite to the heat flux. These results have important implications to plasma-facing materials in fusion environments. We demonstrate that the steady-state profiles when the mass-heat coupling is considered varies significantly from the decoupled case. |
| Proceedings Inclusion? |
Undecided |