Hole formation effect on surface morphological response of plasma-facing tungsten
Abstract
We report simulation results on the effect of helium (He) bubble bursting-mediated surface hole formation on the surface morphological response of tungsten plasma-facing components (PFCs) in nuclear fusion devices. Our analysis is based on an atomistically informed, continuum-scale model, which is capable of accessing the spatiotemporal scales relevant to the fuzz nanostructure formation process on the surface of PFC tungsten. Our simulations account, in an empirical fashion, for two types of subsurface bubble dynamical phenomena in the nanobubble region of PFC tungsten during He plasma irradiation, involving bubble bursting and surface crater formation. We demonstrate that the hole formation effect on the PFC tungsten surface accelerates the growth rate of nanotendrils and the onset of fuzz formation. As a result, the predicted incubation time for surface nanotendril growth is shortened, in agreement with experimental data of incubation fluence at comparable plasma exposure conditions. We also explore systematically the dependence of the PFC surface morphological response on the areal density of holes introduced at regular time intervals onto the He-implanted tungsten surface, a parameter in our analysis that serves as a proxy for the rate of He bubble bursting. More importantly, our simulations capture fine surface features in the PFC tungstenmore »
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1783326
- Grant/Contract Number:
- SC0018421; SC0006661
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Name: Journal of Applied Physics Journal Volume: 129 Journal Issue: 19; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Chen, Chao-Shou, Dasgupta, Dwaipayan, Wirth, Brian D., and Maroudas, Dimitrios. Hole formation effect on surface morphological response of plasma-facing tungsten. United States: N. p., 2021.
Web. doi:10.1063/5.0050195.
Chen, Chao-Shou, Dasgupta, Dwaipayan, Wirth, Brian D., & Maroudas, Dimitrios. Hole formation effect on surface morphological response of plasma-facing tungsten. United States. https://doi.org/10.1063/5.0050195
Chen, Chao-Shou, Dasgupta, Dwaipayan, Wirth, Brian D., and Maroudas, Dimitrios. Mon .
"Hole formation effect on surface morphological response of plasma-facing tungsten". United States. https://doi.org/10.1063/5.0050195.
@article{osti_1783326,
title = {Hole formation effect on surface morphological response of plasma-facing tungsten},
author = {Chen, Chao-Shou and Dasgupta, Dwaipayan and Wirth, Brian D. and Maroudas, Dimitrios},
abstractNote = {We report simulation results on the effect of helium (He) bubble bursting-mediated surface hole formation on the surface morphological response of tungsten plasma-facing components (PFCs) in nuclear fusion devices. Our analysis is based on an atomistically informed, continuum-scale model, which is capable of accessing the spatiotemporal scales relevant to the fuzz nanostructure formation process on the surface of PFC tungsten. Our simulations account, in an empirical fashion, for two types of subsurface bubble dynamical phenomena in the nanobubble region of PFC tungsten during He plasma irradiation, involving bubble bursting and surface crater formation. We demonstrate that the hole formation effect on the PFC tungsten surface accelerates the growth rate of nanotendrils and the onset of fuzz formation. As a result, the predicted incubation time for surface nanotendril growth is shortened, in agreement with experimental data of incubation fluence at comparable plasma exposure conditions. We also explore systematically the dependence of the PFC surface morphological response on the areal density of holes introduced at regular time intervals onto the He-implanted tungsten surface, a parameter in our analysis that serves as a proxy for the rate of He bubble bursting. More importantly, our simulations capture fine surface features in the PFC tungsten surface morphology and predict that the average spacing between nanotendrils is on the order of 100 nm, consistent with the experimental findings.},
doi = {10.1063/5.0050195},
journal = {Journal of Applied Physics},
number = 19,
volume = 129,
place = {United States},
year = {Mon May 17 00:00:00 EDT 2021},
month = {Mon May 17 00:00:00 EDT 2021}
}
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