Thermal desorption of helium irradiated beryllium studied by THDS, NDP, PA and SEM

Eleveld, H.; Veen, A. van; Labohm, F.; Moor, M.W. de

doi:10.1016/0022-3115(94)90979-2

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…On the contrary, the high temperature peak initially increases with deposition temperature and then decreases for the deposition temperature of 475 K, when also another lower temperature peak appears. The high temperature peak coincides with the desorption around 900 K observed by Eleveld et al [26], where TDS was performed after He ions were implanted into the Be samples. At 900 K the He-vacancy complex dissociates in Be and leads to an extensive He bubble growth [24].…”

Section: Discussionsupporting

confidence: 81%

“…At 900 K the He-vacancy complex dissociates in Be and leads to an extensive He bubble growth [24]. He is not released until the bubbles are extended to the surface [26], which can occur already around 900 K for our thin layers. The absence of He desorption for the deposition at room temperature is not clear and additional experiments are needed to investigate this desorption behavior.…”

Section: Discussionmentioning

confidence: 93%

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The influence of helium on deuterium retention in beryllium co-deposits

Založnik¹,

Baldwin²,

Doerner³

et al. 2018

Journal of Nuclear Materials

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Tritium co-deposition with materials from the plasma-facing components is expected to be the main contributor to tritium retention in ITER. Since He will also be present in the plasma as fusion ash during the DT campaign, this study focuses on the effect of He on D retention in Be co-deposits. The PISCES-B linear plasma device was used to create co-deposited BeD He layers for various deposition temperatures (295 K-475 K) and He concentrations in D − αHe plasma mixtures (0 ≤ α ≤ 0.1). Thermal desorption spectroscopy and nuclear reaction analysis were used to determine the D concentration in co-deposits. For the lowest He concentration (1%) an increase of D retention was observed for the deposition at room temperature, whereas for higher He concentrations a declining trend of D retention was found. Including 10% of He in the plasma is found to reduce D retention at deposition temperatures below 425 K and have a negligible effect at higher deposition temperatures.

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