Helium segregation on surfaces of plasma-exposed tungsten

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Dimitrios MaroudasBrian D Wirth

Abstract

We report a hierarchical multi-scale modeling study of implanted helium segregation on surfaces of tungsten, considered as a plasma facing component in nuclear fusion reactors. We employ a hierarchy of atomic-scale simulations based on a reliable interatomic interaction potential, including molecular-statics simulations to understand the origin of helium surface segregation, targeted molecular-dynamics (MD) simulations of near-surface cluster reactions, and large-scale MD simulations of implanted helium evolution in plasma-exposed tungsten. We find that small, mobile He n (1⩽  n  ⩽  7) clusters in the near-surface region are attracted to the surface due to an elastic interaction force that provides the thermodynamic driving force for surface segregation. This elastic interaction force induces drift fluxes of these mobile He n clusters, which increase substantially as the migrating clusters approach the surface, facilitating helium segregation on the surface. Moreover, the clusters' drift toward the surface enables cluster reactions, most importantly trap mutation, in the near-surface region at rates much higher than in the bulk material. These near-surface cluster dynamics have significant effects on the surface morphology, nea...Continue Reading

References

Mar 1, 1985·Physical Review A: General Physics·W G Hoover

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Citations

Jul 4, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhuocen Yang, Karl D Hammond
Jul 21, 2021·Scientific Reports·Rémi Delaporte-MathurinChristian Grisolia
Apr 17, 2020·ACS Applied Materials & Interfaces·Asanka WeerasingheDimitrios Maroudas
Oct 5, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Giridhar NandipatiWahyu Setyawan

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