# Influence of exposure conditions on helium transport and bubble growth in tungsten

Abstract : Helium diffusion, clustering and bubble nucleation and growth is modelled using the finite element method. The existing model from Faney et al. (Model Simul Mater Sci Eng 22:065010, 2018; Nucl Fusion 55:013014, 2015) is implemented with FEniCS and simplified in order to greatly reduce the number of equations. A parametric study is performed to investigate the influence of exposure conditions on helium inventory, bubbles density and size. Temperature is varied from 120 K to 1200 K and the implanted flux of 100 eV He is varied from 10{17}\,{\text{m}^{-2}\, \text{s}^{-1} 10 17 m - 2 s - 1 to 5 \times 10^{21}\, {\text{m}^{-2}\, \text{s}^{-1}}$5 × 10 21 m - 2 s - 1 . Bubble mean size increases as a power law of time whereas the bubble density reaches a maximum. The maximum He content in bubbles was approximately 4 \times 10^{8} 4 × 10 8 He at 5 \times 10^{21}\,{\text{m}^{-2}\, \text{s}^{-1} 5 × 10 21 m - 2 s - 1 . After 1 h of exposure, the helium inventory varies from 5 \times 10^{16} \,{\text{m}^{-2}} 5 × 10 16 m - 2 at low flux and high temperature to 10^{25} \,{\text{m}^{-2}} 10 25 m - 2 at high flux and low temperature. The bubbles inventory varies from 5 \times 10^{12}$ 5 × 10 12 bubbles m ^{-2} - 2 to 2 \times 10^{19} 2 × 10 19 bubbles m ^{-2} - 2 . Comparison with experimental measurements is performed. The bubble density simulated by the model is in quantitative agreement with experiments.
Document type :
Journal articles
Domain :

https://hal.archives-ouvertes.fr/hal-03293417
Contributor : yann Charles Connect in order to contact the contributor
Submitted on : Monday, September 27, 2021 - 2:49:51 PM
Last modification on : Tuesday, April 19, 2022 - 3:48:02 PM
Long-term archiving on: : Tuesday, December 28, 2021 - 6:45:37 PM

### File

80ED5A45-87F8-4057-9581-ECD056...
Files produced by the author(s)

### Citation

Rémi Delaporte-Mathurin, Mykola Ialovega, Etienne Hodille, Jonathan Mougenot, Y. Charles, et al.. Influence of exposure conditions on helium transport and bubble growth in tungsten. Scientific Reports, Nature Publishing Group, 2021, 11 (1), ⟨10.1038/s41598-021-93542-9⟩. ⟨hal-03293417⟩

Record views