Deuterium uptake and sputtering of simultaneous lithiated, boronized, and oxidized carbon surfaces irradiated by low-energy deuterium

Domínguez-Gutiérrez, F.J.; Krstić, Predrag; Allain, Jean Paul; Bedoya, F.; Islam, Mahbubul; Lotfi, Roghayyeh; Duin, Adri C. T. van

doi:10.1063/1.5026415

Cited by 8 publications

(1 citation statement)

References 30 publications

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“…Contrary to simple Li [19], deuterium uptake in B(C)/Li does not seem connected to the oxygen content. This might also be due to the dominant role of carbon in binding deuterium, as suggested by recent classical molecular dynamic simulations of Li-B-C-O:D complexes [20]. The consistent performance of these coatings makes the boron-lithium combination an interesting getter for devices like TJ-II that struggle with density control [1].…”

Section: Deuterium Retention Properties Of B(c)/limentioning

confidence: 96%

Boron synergies in lithium film performance

Devitre

Oyarzábal²,

Fernández-Berceruelo³

et al. 2020

Nucl. Fusion

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Fusion experiments use lithium and boron getters to capture impurities and control the density of fuel species in the plasma. In the TJ-II Stellarator, the addition of a boron-carbon substrate was found to extend the lifetime of the very reactive lithium wall conditioning. However, the synergies between the lithium layer and the underlying boron-carbon, or the effect of a glow discharge cleaning, on oxygen and deuterium gettering are not fully understood. Laboratory experiments were therefore initiated to gain deeper insight on the getter properties of B(C)/Li walls. The coatings were exposed to oxygen gas and plasmas while the capture and release of O was followed by mass spectrometry. Without the boron substrate, the maximum oxygen uptake is half the number of lithium atoms in the film for both oxygen gas and oxygen plasma. Conversely, the behaviour of B(C)/Li walls depends on the nature of the oxidation process: molecular oxygen (O:Li ≈ 0.15) or plasma (O:Li ≈ 0.50). The oxygen plasma gettering is thus preserved against molecular oxidation, e.g. an overnight exposure to the residual gas. While oxygen is known to promote hydrogen retention in lithium, the oxygen content of a B(C)/Li coating shows little effect on deuterium retention. Unlike simple lithium, the oxygen and deuterium gettering of B(C)/Li recovers after a helium glow discharge treatment. These advantageous features clearly point to a change in chemistry, with complex interactions between film constituents and the oxygen-rich environment of magnetic fusion devices.

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Section: Deuterium Retention Properties Of B(c)/limentioning

confidence: 96%

Boron synergies in lithium film performance

Devitre

Oyarzábal²,

Fernández-Berceruelo³

et al. 2020

Nucl. Fusion

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Sputtering and reflection processes from amorphous lithium surfaces by low-energy impacts of H and D atoms and D2 molecules

Krstić

Ostrowski²,

Domínguez-Gutiérrez³

et al. 2022

Journal of Nuclear Materials

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Energy, angle, and temperature dependencies of the sticking of D atoms on Li surfaces

Krstić

Abe

Schiltz-Rouse

et al. 2022

Journal of Applied Physics

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Detailed experimental and computational information on the response of lithium surfaces to irradiation by slow hydrogenic particles (ions, atoms, molecules) is sparse and mainly speculative. In this work, we present a computational study of the reflection and retention of deuterium (D) atoms at crystalline and amorphous lithium surfaces at 300 and 500 K, where the D atoms have an impact energy in the range of 0.025–5 eV and incident angles of 0° (perpendicular incidence) or 85° (near-grazing incidence). Classical molecular dynamics simulations are performed with the reactive bond-order force field (ReaxFF) potentials. This study provides quantitative information on the deuterium sticking probability and recycling coefficient for lithium surfaces. Our results support the ongoing work at the Lithium Tokamak eXperiment- β fusion experiment as well as relevant experiments in the laboratory setting.

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Deuterium uptake and sputtering of simultaneous lithiated, boronized, and oxidized carbon surfaces irradiated by low-energy deuterium

Abstract: Accessing the band alignment in high efficiency Cu(In,Ga)(Se,S) 2 (CIGSSe) solar cells with an In x S y :Na buffer based on temperature dependent measurements and simulations

Cited by 8 publications

References 30 publications

Boron synergies in lithium film performance

Boron synergies in lithium film performance

Sputtering and reflection processes from amorphous lithium surfaces by low-energy impacts of H and D atoms and D2 molecules

Energy, angle, and temperature dependencies of the sticking of D atoms on Li surfaces

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