Codeposition of deuterium ions with beryllium oxide at elevated temperatures

Маркин, А. А.; Dubkov, V. P.; Gorodetsky, А.Е.; Negodaev, M.; Rozhanskii, N. V.; Scaffidi-Argentina, F.; Werle, H.; Wu, C.H.; Zalavutdinov, R.Kh.; Захаров, А.П.

doi:10.1016/s0022-3115(00)00286-5

Cited by 8 publications

(13 citation statements)

References 5 publications

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“…4 are characterized by a rapid onset that approximately coincides with the coupon temperature during collection. Further, the commonality between desorption profiles is suggestive of a single trapping mechanism, which is unlike that found with either co-deposition with BeO ($900 K) [8] (despite the high O content in the layers collected at 423 K and 523 K), or thermal release from implanted pure beryllium [9].…”

Section: Resultsmentioning

confidence: 58%

Composition and hydrogen isotope retention analysis of co-deposited C/Be layers

Baldwin

Schmid

Doerner

et al. 2005

Journal of Nuclear Materials

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Section: Resultsmentioning

confidence: 58%

Composition and hydrogen isotope retention analysis of co-deposited C/Be layers

Baldwin

Schmid

Doerner

et al. 2005

Journal of Nuclear Materials

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“…Indeed data from [30] relates to beryllium oxide layers while the layers created in this study have a low oxygen content (less than 10%). Using this scaled approach, a reliable comparison of the data from different experiments seems to be possible if the different layer formation conditions are known.…”

Section: Applicability Of the Scaling Expression To Literature Datamentioning

confidence: 99%

“…Finally, in [30] beryllium oxide (BeO) layers were produced by sputtering a beryllium target with 10 keV Ne ions in deuterium gas at a pressure of 1 Pa. Sputtered atoms are deposited on a tungsten substrate located at a distance of 2 cm from the sputtered spot on the target. The substrate is negatively biased to provide the simultaneous bombardment of the growing film surface with deuterium ions generated by Ne + -D 2 collisions.…”

Section: Applicability Of the Scaling Expression To Literature Datamentioning

confidence: 99%

“…A comparison of the experimentally measured D/Be ratio found in each of these references with the D/Be ratio predicted by equation (3), is shown in figure 7. For the data extracted from [30], only the data obtained with a bias of -50 V are shown. The 400 eV data of [30] have been excluded since the scaling expression determined here is not experimentally determined over a particle energy of 62 eV.…”

Section: Applicability Of the Scaling Expression To Literature Datamentioning

confidence: 99%

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An empirical scaling for deuterium retention in co-deposited beryllium layers

et al. 2008

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Abstract.Different mechanisms will contribute to tritium retention in ITER, amongst which co-deposition with materials from the plasma-facing components may be the main contributor. A systematic study of the influence of the deposition conditions (substrate temperature, deposition rate, energy of the incident particles) on the deuterium retention in co-deposited beryllium layers has been carried out in PISCES-B. The mechanism by which deuterium co-deposits with beryllium appears to be a combination of co-deposition and implantation, with a decreased retention for increased deposition rate and an increased retention for increased incident deuterium particles energy. A scaling equation is developed, providing a method to predict the retention in Be codeposits formed in PISCES-B as a function of the layer formation conditions. Using this equation, previously published data on retention in Be co-deposits are re-examined and relatively good agreement is found with the prediction of the scaling equation.

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“…Given these distributions and the temperatures in the ITER divertor one can determine where potentially Be rich Be/W alloys may form. Also based on literature data for the Behydrogen co-deposition [1,2,3,4,5] one can estimate the potential T co-deposition in the ITER divertor. To simplify the erosion/deposition calculations an ITER with a full W divertor is considered in the calculations.…”

Section: Introductionmentioning

confidence: 99%

Beryllium flux distribution and layer deposition in the ITER divertor

Schmid

2008

Nucl. Fusion

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Abstract.The deposition of Be eroded from the main chamber wall on the W surfaces in the ITER divertor could result in the formation of Be rich Be/W mixed layers with a low melting temperature compared to pure W. To predict whether or not these layers form the Be flux distribution in the ITER divertor is required. This paper presents the results of a combination of plasma transport-with erosion/deposition simulations that allow to calculate both the Be flux distribution and the Be layer deposition in the ITER divertor. This model includes the Be source due to Be erosion in the main chamber and the deposition, re-erosion and re-deposition of Be in the ITER divertor. The calculations show that the fraction of Be in the incident particle flux in the divertor range from ≈ 10 −3 to ≈ 5% with a pronounced inner outer divertor asymmetry. The flux fractions in the inner divertor are on average ten times higher than in the outer divertor. Thick Be layers only from at the inner strike point and the dome baffles. The highest Be layer growth rate is found to be 1.0 nm/s. Despite the Be deposition the formation of Be rich Be/W mixed layers is not to be expected in ITER. The expected surface temperature at these locations during steady state operation is too low as to result in Be diffusion into W and thus Be/W mixed layers can not form.

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Codeposition of deuterium ions with beryllium oxide at elevated temperatures

Cited by 8 publications

References 5 publications

Composition and hydrogen isotope retention analysis of co-deposited C/Be layers

Composition and hydrogen isotope retention analysis of co-deposited C/Be layers

An empirical scaling for deuterium retention in co-deposited beryllium layers

Beryllium flux distribution and layer deposition in the ITER divertor

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