Analytical approach for description of deuterium content in deuterium-beryllium co-deposited layers

Krat, S.; Gasparyan, Yu. M.; Vasina, Ya. A.; Prishvitsyn, A. S.; Temmerman, G. De; Писарев, А. А.

doi:10.1016/j.nme.2021.100949

Cited by 2 publications

(2 citation statements)

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“…This scaling law was later revised [15], where a ratio of D and Be particle fluxes to the substrate was used instead of the deposition rate. In separate work, Krat et al [16] took a different approach and derived a model based on diffusion-reaction equations governing particle diffusion, trapping/de-trapping, and implantation in co-deposited layers. The model thus obtained lacks the simplicity of the empirical GdT scaling law and relies on the knowledge of the material constants, such as diffusion and surface recombination parameters, reported values of which can exhibit a large scatter across the literature.…”

Section: Introductionmentioning

confidence: 99%

Improved scaling law for the prediction of deuterium retention in beryllium co-deposits

et al. 2022

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Hydrogen isotope co-deposition with Be eroded from the first wall is expected to be the main fusion fuel retention mechanism in ITER. Since good fuel accounting is crucial for economic and safety reasons, reliable predictions of hydrogen isotope retention are needed. This study builds upon the well-established empirical De Temmerman scaling law [1] that predicts D/Be ratios in co-deposited layers based on deposition temperature, deposition rate, and deuterium particle energy. Expanding the data used in the original development of the scaling law with an additional dataset obtained with more recent measurements using a different technique to the original De Temmerman approach, allows us to obtain new values for free parameters and improve the prediction capabilities of the new scaling law. In an effort to improve the model even further, scaling with D2 background pressure was included and a new two-term model derived, describing D retention in low- and high-energy traps separately.

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Section: Introductionmentioning

confidence: 99%

Improved scaling law for the prediction of deuterium retention in beryllium co-deposits

et al. 2022

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“…Tritium accumulation is an issue for ITER and consequently processes involving T trapping need to be investigated. Retention and release in ITER first wall co-deposits have to be estimated using knowledge acquired from currently operating tokamaks and from laboratory experiments [1][2][3][4]. In the Joint European Torus (JET) tokamak in the ITER-like wall (ILW) configuration (divertor in tungsten, W, and limiters in beryllium, Be), a hydrogen isotope inventory has been recently performed on limiters during the three first campaigns, 2011-2012, 2013-2014 and 2015-2016, labelled respectively ILW1, ILW2 and ILW3 [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

D retention and material defects probed using Raman microscopy in JET limiter samples and beryllium-based synthesized samples

Pardanaud¹,

Kumar²,

Roubin³

et al. 2021

Phys. Scr.

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We report on the detection by means of Raman spectroscopy of amorphous beryllium deuteride, BeD2, in magnetron sputtered deposits synthesized in two different laboratories and containing about 20 at% of deuterium. In contrast, this signature has not been found for the JET limiter samples studied coming from the inner, outer or upper limiters, even when coming from a deposition zone of the limiters. We give a way to disentangle that BeD2 signature from other signatures falling in the same spectroscopic range and mainly related to other phenomena. We also analyze the Raman characteristics of the JET sample defects. These results could help in the interpretation of D thermal desorption spectra and in future analyses of JET thick Be deposit divertor tiles.

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Analytical approach for description of deuterium content in deuterium-beryllium co-deposited layers

Cited by 2 publications

References 48 publications

Improved scaling law for the prediction of deuterium retention in beryllium co-deposits

Improved scaling law for the prediction of deuterium retention in beryllium co-deposits

D retention and material defects probed using Raman microscopy in JET limiter samples and beryllium-based synthesized samples

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