Investigation of hydrogen isotope retention mechanisms in beryllium: High resolution TPD measurements
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The retention of ion-implanted deuterium in beryllium poly-and single crystals at room temperature was studied using high precision temperature programmed desorption spectroscopy (TPD).Abstract:
The retention of ion-implanted deuterium in beryllium poly- and single crystals at room temperature is studied using high precision temperature programmed desorption spectroscopy (TPD). Slow temperature ramps of 0.01 K/s in combination with well-defined experimental conditions are used to resolve the low temperature desorption regime for the first time revealing three sharp desorption peaks. The comparison to results of a coupled reaction diffusion system (CRDS) model shows, that the corresponding release mechanisms cannot be described by thermally activated rate processes. SEM images of a polycrystalline beryllium sample after implantation of deuterium with 2 keV per D atom show the formation of blisters of roughly 1 µm in diameter. Additionally, cracks on top of the blisters are found as well as spots, on which blisters are peeled off. Both processes are discussed to play a role in the low temperature release regime of the retained deuterium. Investigation of TPD spectra performed on single crystalline beryllium shows a jagged pattern in the low temperature release regime, which can be connected to blisters bursting up, releasing big amounts of deuterium in short time scales.read more
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Deuterium retention in Be-D co-deposits formed over an ITER relevant parameter space
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A high temperature dual-mode quartz crystal microbalance technique for erosion and thermal desorption spectroscopy measurements.
R. Stadlmayr,Paul Stefan Szabo,Herbert Biber,H. R. Koslowski,Elisabeth Kadletz,C. Cupak,Richard A. Wilhelm,Michael Schmid,Christian Linsmeier,Friedrich Aumayr +9 more
TL;DR: It is found that more than 90% of the deuterium implanted into a thin film of beryllium is released during a subsequent temperature ramp up to 500 K, which is demonstrated by a study of the retention and release behavior of hydrogen isotopes in fusion-relevant materials.
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CRDS modelling of deuterium release from co-deposited beryllium layers in temperature programmed and laser induced desorption experiments
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Thermal desorption of gases
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TL;DR: The progress in the ITER Physics Basis (PIPB) document as discussed by the authors is an update of the IPB, which was published in 1999 [1], and provides methodologies for projecting the performance of burning plasmas, developed largely through coordinated experimental, modelling and theoretical activities carried out on today's large tokamaks (ITER Physics R&D).
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Retention mechanisms and binding states of deuterium implanted into beryllium
TL;DR: In this article, the retention of D+ ions implanted into clean and oxidized single crystalline Be at room and elevated temperatures is investigated by a combination of in situ analytical techniques including temperature programmed desorption (TPD), nuclear reaction analysis, low-energy ion spectroscopy (LEIS) and x-ray photoelectron spectroscopic.
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Adsorption of hydrogen on Be(0001) surfaces
V. Lossev,Jürgen Küppers +1 more
TL;DR: In this article, the authors investigated the interaction of thermal H atoms with clean and oxygen-covered Be(0001) surfaces using thermal desorption spectroscopy, TDS, and found that the adsorption is endothermic with respect to H 2 Be and above 300 K hydrogen absorption in Be occurs competitively to desorptions.
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Retention and release mechanisms of deuterium implanted into beryllium
TL;DR: In this paper, the authors investigated the influence of single parameters on retention and release in laboratory experiments performed under well defined conditions with the aim to identify dominant underlying mechanisms and thus be able to predict the behavior of the Be wall in ITER.
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