The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions

Abstract Tungsten is a promising plasma facing material for fusion reactors. Despite many favorable properties, helium ions incoming from the plasma are known to dramatically affect the microstructure of tungsten, leading to bubble growth, blistering, and/or to the formation of fuzz. In order to dev...

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Autores principales:	Danny Perez, Luis Sandoval, Sophie Blondel, Brian D. Wirth, Blas P. Uberuaga, Arthur F. Voter
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/865b53dcbd5f40d9af65e81f5f59712d
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spelling	oai:doaj.org-article:865b53dcbd5f40d9af65e81f5f59712d2021-12-02T15:06:23ZThe mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions10.1038/s41598-017-02428-22045-2322https://doaj.org/article/865b53dcbd5f40d9af65e81f5f59712d2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02428-2https://doaj.org/toc/2045-2322Abstract Tungsten is a promising plasma facing material for fusion reactors. Despite many favorable properties, helium ions incoming from the plasma are known to dramatically affect the microstructure of tungsten, leading to bubble growth, blistering, and/or to the formation of fuzz. In order to develop mitigation strategies, it is essential to understand the atomistic processes that lead to bubble formation and subsequent microstructural changes. In this work, we use large-scale Accelerated Molecular Dynamics simulations to investigate small (N = 1,2) V N He M vacancy/helium complexes, which serve as the nuclei for larger helium bubble growth, over timescales reaching into the milliseconds under conditions typical of the operation of fusion reactors. These complexes can interconvert between different I L V N+L He M variants via Frenkel pair nucleation (leading to the creation of a additional vacancy/interstitial pair) and annihilation events; sequences of these events can lead to net migration of these embryonic bubbles. The competition between nucleation and annihilation produces a very complex dependence of the diffusivity on the number of heliums. Finally, through cluster dynamics simulations, we show that diffusion of these complexes provides an efficient pathway for helium release at fluxes expected in fusion reactors, and hence that accounting for the mobility of these complexes is crucial.Danny PerezLuis SandovalSophie BlondelBrian D. WirthBlas P. UberuagaArthur F. VoterNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Danny Perez Luis Sandoval Sophie Blondel Brian D. Wirth Blas P. Uberuaga Arthur F. Voter The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
description	Abstract Tungsten is a promising plasma facing material for fusion reactors. Despite many favorable properties, helium ions incoming from the plasma are known to dramatically affect the microstructure of tungsten, leading to bubble growth, blistering, and/or to the formation of fuzz. In order to develop mitigation strategies, it is essential to understand the atomistic processes that lead to bubble formation and subsequent microstructural changes. In this work, we use large-scale Accelerated Molecular Dynamics simulations to investigate small (N = 1,2) V N He M vacancy/helium complexes, which serve as the nuclei for larger helium bubble growth, over timescales reaching into the milliseconds under conditions typical of the operation of fusion reactors. These complexes can interconvert between different I L V N+L He M variants via Frenkel pair nucleation (leading to the creation of a additional vacancy/interstitial pair) and annihilation events; sequences of these events can lead to net migration of these embryonic bubbles. The competition between nucleation and annihilation produces a very complex dependence of the diffusivity on the number of heliums. Finally, through cluster dynamics simulations, we show that diffusion of these complexes provides an efficient pathway for helium release at fluxes expected in fusion reactors, and hence that accounting for the mobility of these complexes is crucial.
format	article
author	Danny Perez Luis Sandoval Sophie Blondel Brian D. Wirth Blas P. Uberuaga Arthur F. Voter
author_facet	Danny Perez Luis Sandoval Sophie Blondel Brian D. Wirth Blas P. Uberuaga Arthur F. Voter
author_sort	Danny Perez
title	The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
title_short	The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
title_full	The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
title_fullStr	The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
title_full_unstemmed	The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
title_sort	mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/865b53dcbd5f40d9af65e81f5f59712d
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The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions

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