Effect of composition and surface characteristics on fuel retention in beryllium-containing co-deposited layers

Antti Hakola (Corresponding Author), Kalle Heinola, Kenichiro Mizohata, Jari Likonen, Cristian Lungu, Corneliu Porosnicu, Eduardo Alves, Rodrigo Mateus, Iva Bogdanovic Radovic, Zdravko Siketic, Vincenc Nemanic, Mohit Kumar, Cedric Pardanaud, Pascale Roubin,

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We have investigated retention of deuterium in beryllium-containing, laboratory-made films whose properties resemble co-deposits observed on JET-ILW or predicted for ITER. The samples were prepared using High Power Impulse Magnetron Sputtering and Thermo-ionic Vacuum Arc Deposition. We have observed that retention depends on the flux of D atoms on the growing film, but even more prominently on its composition, structure, and morphology. Especially, inclusion of carbon by 10-15 at% in the layers can increase retention by a factor of 2-10. This we attribute to increasing number of defects as well as aromatic and aliphatic C-D bonds in the samples. Other impurities do not significantly alter the D inventory while more D is retained in samples with rough or highly modified surfaces. Our results show that reproducing the reported D concentrations of ∼5 at% in JET-ILW-like deposits requires keeping the sample temperature at 100-200 °C during the production phase and optimizing the uniformity of deposition fluxes. Data from Be-D samples further indicate that fuel retention in more ITER-relevant co-deposits would be around 1-2 at%.

Original languageEnglish
Article number014038
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
Publication statusPublished - 1 Jan 2020
MoE publication typeA1 Journal article-refereed
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: 20 May 201924 May 2019

Keywords

  • Beryllium
  • Co-deposition
  • Fuel retention

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    Hakola, A., Heinola, K., Mizohata, K., Likonen, J., Lungu, C., Porosnicu, C., Alves, E., Mateus, R., Radovic, I. B., Siketic, Z., Nemanic, V., Kumar, M., Pardanaud, C., Roubin, P. (2020). Effect of composition and surface characteristics on fuel retention in beryllium-containing co-deposited layers. Physica Scripta, 2020(T171), [014038]. https://doi.org/10.1088/1402-4896/ab4be8