Suppression of Helium Bubble Nucleation in Beryllium Exposed Tungsten Surfaces.

Cusentino, M. A.; Wood, M. A.; Thompson, A. P.

doi:10.1088/1741-4326/abb148

Title: Suppression of Helium Bubble Nucleation in Beryllium Exposed Tungsten Surfaces.

Journal Article · Tue Oct 06 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abb148· OSTI ID:1671807

^[1]; Wood, M. A. ^[1];

^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

One of the most severe obstacles to increasing the longevity of tungsten-based plasma facing components, such as divertor tiles, is the surface deterioration driven by sub-surface helium bubble formation and rupture. Supported by experimental observations at PISCES, this work uses molecular dynamics simulations to identify the microscopic mechanisms underlying suppression of helium bubble formation by the introduction of plasma-borne beryllium. Simulations of the initial surface material (crystalline W), early-time Be exposure (amorphous W-Be) and final WBe₂ intermetallic surfaces were used to highlight the effect of Be. Significant differences in He retention, depth distribution and cluster size were observed in the cases with beryllium present. Helium resided much closer to the surface in the Be cases with nearly 80% of the total helium inventory located within the first 2 nm. Moreover, coarsening of the He depth profile due to bubble formation is suppressed due to a one-hundred fold decrease in He mobility in WBe2, relative to crystalline W. This is further evidenced by the drastic reduction in He cluster sizes even when it was observed that both the amorphous W-Be and WBe₂ intermetallic phases retain nearly twice as much He during cumulative implantation studies.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1671807

Alternate ID(s):: OSTI ID: 1670494

Report Number(s):: SAND2020-8958J; 690212; TRN: US2203915

Journal Information:: Nuclear Fusion, Vol. 60, Issue 12; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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