Helium diffusion and bubble evolution in tungsten nanotendrils

Cusentino, Mary Alice; Wirth, Brian D.

doi:10.1016/j.commatsci.2020.109875

Helium diffusion and bubble evolution in tungsten nanotendrils

Journal Article · Tue Jul 14 00:00:00 EDT 2020 · Computational Materials Science

DOI:https://doi.org/10.1016/j.commatsci.2020.109875· OSTI ID:1639053

Cusentino, Mary Alice ^[1]; ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Herein, we describe molecular dynamics simulations of helium implantation in geometries resembling tungsten nanotendrils observed in helium plasma exposure experiments. Helium atoms self-cluster and nucleate bubbles within the tendrillike geometries. However, helium retention in these geometries is lower than planar surfaces due to higher surface area to volume ratio which allows for continual bubble expansion and non-destructive release of helium atoms from the nanotendril. Limited diffusion of helium atoms deeper into the tendril was observed, and diffusion was enhanced with pre-existing, subsurface helium bubbles. Diffusion coefficients on the order of 10^-12 -10^-11 m² s^-1 were calculated. This suggests that while helium diffusion is low, it is still feasible that helium can diffuse to the base of a nanotendril to continue to drive fuzz growth.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-05CH11231; AC04-94AL85000; NA0003525

OSTI ID:: 1639053

Alternate ID(s):: OSTI ID: 1778358
OSTI ID: 1670732

Report Number(s):: SAND--2020-6212J; 686751

Journal Information:: Computational Materials Science, Journal Name: Computational Materials Science Vol. 183; ISSN 0927-0256

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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