Analytical model of hydrogen inventory saturation in the subsurface of the wall material and comparison to Reaction-Diffusion simulations

Denis, Julien; Hodille, E.; Marandet, Y.; Ferro, Y.

doi:10.1016/j.jnucmat.2022.153972

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Such behavior has already been reported in previous studies investigating fuel recycling with rate equation simulations [61,62]. The first characteristic time is due to the build up of the subsurface inventory, especially the growth of c m in the implantation zone [62]. In our simulations, the build up of the surface inventory also play an important role as increasing c surf changing E des (figure 2).…”

Section: On the Retention Dynamicssupporting

confidence: 86%

“…Without sputtering, different characteristic times can be observed. Such behavior has already been reported in previous studies investigating fuel recycling with rate equation simulations [61,62]. The first characteristic time is due to the build up of the subsurface inventory, especially the growth of c m in the implantation zone [62].…”

Section: On the Retention Dynamicssupporting

confidence: 78%

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Deuterium uptake, desorption and sputtering from W(110) surface covered with oxygen

Hodille,

Pavec,

Denis

et al. 2024

Nucl. Fusion

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Rate equation modelling is performed to simulate D2 and D2+D2 + exposure of the W(110) surface with varying coverage of oxygen atoms (O) from the clean surface up to 0.75 monolayer of O. Density functional Theory (DFT) calculated energetics are used as inputs for the surface processes and desorption energies are optimized to best reproduce the thermal desorption spectrometry (TDS) experiments obtained for D2 exposure. For the clean surface, the optimized desorption energies (1.10 eV to 1.40 eV) are below the DFT ones (1.30 eV to 1.50 eV). For the O covered surface, the main desorption peak is reproduced with desorption energies of 1.1 eV and 1.0 eV for 0.50 and 0.75 monolayer of O respectively. This is slightly higher than the DFT predicted desorption energies. In order to simulate satisfactorily the total retention botained experimentally for D2+D2 + exposure, a sputtering process needs to be added to the model, describing the sputtering of adsorbed species (D atoms) by the incident D ions. The impact of the sputtering process on the shape of the TDS spectra, on the total retention and on the recycling of D from the wall is discussed. In order to better characterize the sputtering process, especially its products and yields, atomistic calculations such as molecular dynamics are suggested as a next step for this study.

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Section: On the Retention Dynamicssupporting

confidence: 86%

Section: On the Retention Dynamicssupporting

confidence: 78%

Deuterium uptake, desorption and sputtering from W(110) surface covered with oxygen

Hodille,

Pavec,

Denis

et al. 2024

Nucl. Fusion

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“…Such a thin surface layer saturated with D is often called a D supersaturated surface layer (DSSL). Because of its unique state, both experimental [2][3][4] and theoretical [5][6][7][8][9] work have been conducted in recent years to clarify its basic properties such as the DSSL thickness, ∆t DSSL , and the D retention in DSSLs, as well as its formation mechanism and condition.…”

Section: Introductionmentioning

confidence: 99%

Deuterium supersaturated surface layer in tungsten: ion energy dependence

Nishijima,

Tokitani,

Nagata

et al. 2023

Nucl. Fusion

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Properties of deuterium (D) supersaturated surface layers (DSSLs) formed in tungsten (W), such as thickness, internal microstructures, and D retention, are experimentally investigated as a function of the incident ion energy, E i. W samples were exposed to D plasmas in the PISCES-A linear plasma device in a range of E i ∼ 45–175 eV, while other plasma exposure parameters were fixed: sample temperature, T s, ∼423 K, ion flux, Γi, ∼1.2 × 1021 m−2s−1, and fluence, Φi, ∼3.0 × 1024 m−2. High-resolution, cross-sectional, transmission electron microscopy observations confirm that (1) a DSSL forms even at the lowest E i ∼ 45 eV, (2) the DSSL thickness, Δt DSSL, is found to decrease with decreasing E i from ∼11–12 nm at E i ∼ 175 eV to ∼5–6 nm at ∼45 eV, and to agree with approximately the maximum implantation depth calculated using SDTrimSP, and (3) high-density D nanobubbles with a diameter of ∼1 nm or less exist inside the DSSL, which is deemed to validate a theory-predicted vacancy stabilization process due to trapping of a solute D atom(s). Utilizing a D areal density of ∼4.2 × 1019 m−2 in the first 14 nm from the surface at E i ∼ 75 eV from nuclear reaction analysis and the measured E i dependence of Δt DSSL, our previous laser-induced breakdown spectroscopy data is updated: both dynamic and static D retention increase with decreasing E i, and the D/W atomic fraction during plasma exposure reaches ∼0.3 at E i ∼ 45 eV. A possible DSSL formation mechanism is proposed.

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Effect of material properties on the laser-induced desorption of hydrogen from tungsten

Kulagin,

Gasparyan

2023

Journal of Nuclear Materials

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Analytical model of hydrogen inventory saturation in the subsurface of the wall material and comparison to Reaction-Diffusion simulations

Cited by 5 publications

References 26 publications

Deuterium uptake, desorption and sputtering from W(110) surface covered with oxygen

Deuterium uptake, desorption and sputtering from W(110) surface covered with oxygen

Deuterium supersaturated surface layer in tungsten: ion energy dependence

Effect of material properties on the laser-induced desorption of hydrogen from tungsten

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