Helium diffusion and bubble evolution in tungsten nanotendrils
Abstract
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.
- Authors:
-
[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)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1639053
- Alternate Identifier(s):
- OSTI ID: 1778358
- Report Number(s):
- SAND-2020-6212J
Journal ID: ISSN 0927-0256; 686751
- Grant/Contract Number:
- AC04-94AL85000; AC02-05CH11231; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Computational Materials Science
- Additional Journal Information:
- Journal Volume: 183; Journal ID: ISSN 0927-0256
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Cusentino, Mary Alice, and Wirth, Brian D. Helium diffusion and bubble evolution in tungsten nanotendrils. United States: N. p., 2020.
Web. doi:10.1016/j.commatsci.2020.109875.
Cusentino, Mary Alice, & Wirth, Brian D. Helium diffusion and bubble evolution in tungsten nanotendrils. United States. https://doi.org/10.1016/j.commatsci.2020.109875
Cusentino, Mary Alice, and Wirth, Brian D. Tue .
"Helium diffusion and bubble evolution in tungsten nanotendrils". United States. https://doi.org/10.1016/j.commatsci.2020.109875. https://www.osti.gov/servlets/purl/1639053.
@article{osti_1639053,
title = {Helium diffusion and bubble evolution in tungsten nanotendrils},
author = {Cusentino, Mary Alice and Wirth, Brian D.},
abstractNote = {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.},
doi = {10.1016/j.commatsci.2020.109875},
journal = {Computational Materials Science},
number = ,
volume = 183,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 2020},
month = {Tue Jul 14 00:00:00 EDT 2020}
}
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