The influence of N on the D retention within W coatings for fusion applications

E. Grigore (Corresponding Author), M. Gherendi, F. Baiasu, M. Firdaouss, C. Hernandez, A. Weckmann, P. Petersson, A. Hakola

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Plasma facing components (PFC) in a fusion device are subjected to a harsh operating environment involving high heat fluxes and exposure to high fluxes of hydrogen isotopes. This exposure can lead to high fuel retention that can raise serious concern from the safety point of view. One of the reasons for the use of W as a material for the construction of the first wall is to reduce fuel retention compared to carbon wall. Nitrogen seeding, used during the operation of fusion reactors, represents a method to cool the divertor plasma and to reduce the W source in the divertor due to ELMs. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior. In this work, the influence of nitrogen on the deuterium content within tungsten coatings produced by reactive high power impulse magnetron sputtering (HIPIMS) was investigated. The deposition process of W coatings in a nitrogen deuterium environment leads to a significant retention of deuterium. Coatings with a deuterium content up to 54 at.% were obtained in the presence of nitrogen compared with a deuterium content of 25 at.% measured for the coatings produced in absence of nitrogen from the deposition atmosphere.

Original languageEnglish
Pages (from-to)1959-1962
Number of pages4
JournalFusion Engineering and Design
Volume146
DOIs
Publication statusPublished - 1 Sep 2019
MoE publication typeNot Eligible

Fingerprint

Deuterium
Nitrogen
Fusion reactions
Coatings
Plasmas
Hydrogen
Nitrogen Isotopes
Isotopes
Tungsten
Fusion reactors
Magnetron sputtering
Heat flux
Carbon
Fluxes

Keywords

  • Deuterium containing coatings
  • HIPIMS
  • Nitrogen seeding
  • Tungsten nitride

Cite this

Grigore, E. ; Gherendi, M. ; Baiasu, F. ; Firdaouss, M. ; Hernandez, C. ; Weckmann, A. ; Petersson, P. ; Hakola, A. / The influence of N on the D retention within W coatings for fusion applications. In: Fusion Engineering and Design. 2019 ; Vol. 146. pp. 1959-1962.
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abstract = "Plasma facing components (PFC) in a fusion device are subjected to a harsh operating environment involving high heat fluxes and exposure to high fluxes of hydrogen isotopes. This exposure can lead to high fuel retention that can raise serious concern from the safety point of view. One of the reasons for the use of W as a material for the construction of the first wall is to reduce fuel retention compared to carbon wall. Nitrogen seeding, used during the operation of fusion reactors, represents a method to cool the divertor plasma and to reduce the W source in the divertor due to ELMs. However an exposure of the PFC to a combination of hydrogen isotopes and nitrogen can lead to changes in properties of exposed surfaces or to unexpected material behavior. In this work, the influence of nitrogen on the deuterium content within tungsten coatings produced by reactive high power impulse magnetron sputtering (HIPIMS) was investigated. The deposition process of W coatings in a nitrogen deuterium environment leads to a significant retention of deuterium. Coatings with a deuterium content up to 54 at.{\%} were obtained in the presence of nitrogen compared with a deuterium content of 25 at.{\%} measured for the coatings produced in absence of nitrogen from the deposition atmosphere.",
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Grigore, E, Gherendi, M, Baiasu, F, Firdaouss, M, Hernandez, C, Weckmann, A, Petersson, P & Hakola, A 2019, 'The influence of N on the D retention within W coatings for fusion applications', Fusion Engineering and Design, vol. 146, pp. 1959-1962. https://doi.org/10.1016/j.fusengdes.2019.03.075

The influence of N on the D retention within W coatings for fusion applications. / Grigore, E. (Corresponding Author); Gherendi, M.; Baiasu, F.; Firdaouss, M.; Hernandez, C.; Weckmann, A.; Petersson, P.; Hakola, A.

In: Fusion Engineering and Design, Vol. 146, 01.09.2019, p. 1959-1962.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Grigore, E.

AU - Gherendi, M.

AU - Baiasu, F.

AU - Firdaouss, M.

AU - Hernandez, C.

AU - Weckmann, A.

AU - Petersson, P.

AU - Hakola, A.

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Grigore E, Gherendi M, Baiasu F, Firdaouss M, Hernandez C, Weckmann A et al. The influence of N on the D retention within W coatings for fusion applications. Fusion Engineering and Design. 2019 Sep 1;146:1959-1962. https://doi.org/10.1016/j.fusengdes.2019.03.075