Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure
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. Exposures resulting in fuzzy and non-fuzzy surfaces were analyzed in order to illuminate the role of He d...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/111162 https://orcid.org/0000-0002-0450-9731 https://orcid.org/0000-0002-9001-5606 |
| _version_ | 1811094828940787712 |
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| author | Woller, Kevin Benjamin Whyte, Dennis G Wright, Graham |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Woller, Kevin Benjamin Whyte, Dennis G Wright, Graham |
| author_sort | Woller, Kevin Benjamin |
| collection | MIT |
| description | 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. 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 Ts = 530–1100 K and irradiated by He flux densities of ΓHe ∼ 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⁻²s⁻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. |
| first_indexed | 2024-09-23T16:06:09Z |
| format | Article |
| id | mit-1721.1/111162 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:06:09Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1111622022-10-02T06:22:08Z Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure Woller, Kevin Benjamin Whyte, Dennis G Wright, Graham Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Woller, Kevin Benjamin Whyte, Dennis G Wright, Graham 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. 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 Ts = 530–1100 K and irradiated by He flux densities of ΓHe ∼ 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⁻²s⁻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. United States. Department of Energy (Award DE-SC00-02060) 2017-09-08T16:03:21Z 2017-09-08T16:03:21Z 2014-12 Article http://purl.org/eprint/type/JournalArticle 0022-3115 http://hdl.handle.net/1721.1/111162 Woller, K.B. et al. “Dynamic Measurement of the Helium Concentration of Evolving Tungsten Nanostructures Using Elastic Recoil Detection During Plasma Exposure.” Journal of Nuclear Materials 463 (August 2015): 289–293 © 2014 Elsevier B.V. https://orcid.org/0000-0002-0450-9731 https://orcid.org/0000-0002-9001-5606 en_US http://dx.doi.org/10.1016/j.jnucmat.2014.11.126 Journal of Nuclear Materials Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier MIT Web Domain |
| spellingShingle | Woller, Kevin Benjamin Whyte, Dennis G Wright, Graham Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title | Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title_full | Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title_fullStr | Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title_full_unstemmed | Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title_short | Dynamic measurement of the helium concentration of evolving tungsten nanostructures using Elastic Recoil Detection during plasma exposure |
| title_sort | dynamic measurement of the helium concentration of evolving tungsten nanostructures using elastic recoil detection during plasma exposure |
| url | http://hdl.handle.net/1721.1/111162 https://orcid.org/0000-0002-0450-9731 https://orcid.org/0000-0002-9001-5606 |
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