Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure
Abstract
Helium (He) concentration depth profiles of evolving tungsten (W) nanostructures have been measured for the first time using in situ Elastic Recoil Detection (ERD) throughout plasma irradiation. In this work, exposures resulting in fuzzy and non-fuzzy surfaces were analyzed in order to illuminate the role of He during the development of these surface morphologies. ERD was performed on samples with surface temperatures from $$T_s$$ = 530–1100 K and irradiated by He flux densities of $$Γ_{\text{He}}$$ ~ 1020–1022 m–2 s–1. He concentration profiles in samples that developed either non-fuzzy or fuzzy surfaces are uniformly shaped with concentrations of 1.5–7 at.%, which is presumed to be too low for pressure driven growth models. Therefore, surface morphology changes are not perpetuated by continuous bubble bursting deformation. Also, a threshold in He flux density above 1020 m–2 s–1 is suggested by using in situ ERD to monitor the depth profile evolution of the He-rich layer while changing the flux during exposure.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
- OSTI Identifier:
- 1897986
- Alternate Identifier(s):
- OSTI ID: 1252286
- Grant/Contract Number:
- SC0002060; DMR-08-19762; SC00-02060
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Nuclear Materials
- Additional Journal Information:
- Journal Volume: 463; Journal ID: ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Woller, K. B., Whyte, D. G., and Wright, G. M. Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure. United States: N. p., 2014.
Web. doi:10.1016/j.jnucmat.2014.11.126.
Woller, K. B., Whyte, D. G., & Wright, G. M. Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure. United States. https://doi.org/10.1016/j.jnucmat.2014.11.126
Woller, K. B., Whyte, D. G., and Wright, G. M. Fri .
"Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure". United States. https://doi.org/10.1016/j.jnucmat.2014.11.126. https://www.osti.gov/servlets/purl/1897986.
@article{osti_1897986,
title = {Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure},
author = {Woller, K. B. and Whyte, D. G. and Wright, G. M.},
abstractNote = {Helium (He) concentration depth profiles of evolving tungsten (W) nanostructures have been measured for the first time using in situ Elastic Recoil Detection (ERD) throughout plasma irradiation. In this work, exposures resulting in fuzzy and non-fuzzy surfaces were analyzed in order to illuminate the role of He during the development of these surface morphologies. ERD was performed on samples with surface temperatures from $T_s$ = 530–1100 K and irradiated by He flux densities of $Γ_{\text{He}}$ ~ 1020–1022 m–2 s–1. He concentration profiles in samples that developed either non-fuzzy or fuzzy surfaces are uniformly shaped with concentrations of 1.5–7 at.%, which is presumed to be too low for pressure driven growth models. Therefore, surface morphology changes are not perpetuated by continuous bubble bursting deformation. Also, a threshold in He flux density above 1020 m–2 s–1 is suggested by using in situ ERD to monitor the depth profile evolution of the He-rich layer while changing the flux during exposure.},
doi = {10.1016/j.jnucmat.2014.11.126},
journal = {Journal of Nuclear Materials},
number = ,
volume = 463,
place = {United States},
year = {Fri Dec 05 00:00:00 EST 2014},
month = {Fri Dec 05 00:00:00 EST 2014}
}
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