Simulation of defects in fusion plasma first wall materials

4th International Workshop & Summer School on Plasma Physics 2010

Troev, T.^1 ; Nankov, N.^1 ; Yoshiie, T.^2

Institute for Nuclear Research and Nuclear Energy, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria^1

Research Reactor Institute, Kyoto University, Kumatori-Cho, Sennan-Gun, Osaka-Fu 590-0494, Japan^2

关键词: Displacement cascades;    First wall materials;    Interatomic potential;    Interstitial clusters;    Molecular dynamics simulations;    Numerical calculation;    Primary knock-on atoms;    Single vacancies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/516/1/012022/pdf
DOI  :  10.1088/1742-6596/516/1/012022

来源: IOP

【 摘 要 】

Numerical calculations of radiation damages in beryllium, alpha-iron and tungsten irradiated by fusion neutrons were performed using molecular dynamics (MD) simulations. The displacement cascades efficiency has been calculated using the Norgett-Robinson-Torrens (NRT) formula, the universal pair-potential of Ziegler-Biersack-Littmark (ZBL) and the EAM inter-atomic potential. The pair potential overestimates the defects production by a factor of 2. The ZBL pair potential results and the EAM are comparable at higher primary knock-on atom (PKA) energies (E > 100 keV). We found that the most common types of defects are single vacancies, di-vacancies, interstitials and small number of interstitial clusters. On the bases of calculated results, the behavior of vacancies, empty nano-voids and nano-voids with hydrogen and helium were discussed.