Helium and hydrogen trapping in tungsten deposition layers formed by helium plasma sputtering

Katayama, Kazunari; Imaoka, K.; Okamura, T.; Nishikawa, Masabumi

doi:10.1016/j.fusengdes.2007.04.026

Cited by 21 publications

(15 citation statements)

References 17 publications

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“…It was reported in [12], that although not measurable, the deuterium content in co-deposited tungsten layers should be below a few percent. In contrast, a more recent study [13], found H/W values of about 0.15 for a tungsten layer formed in a hydrogen plasma.…”

Section: Introductionmentioning

confidence: 76%

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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Section: Introductionmentioning

confidence: 76%

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

et al. 2008

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“…It was therefore concluded that the concentration of D atoms in the W deposition layer was below a few percent [4]. On the other hand, in W layers deposited in a hydrogen RF plasma at a substrate temperature of about 430 K, the ratio of hydrogen to tungsten atoms was observed to be 0.15 H/W [5]. A study of the influence of the deposition conditions on the deuterium retention in codeposited W layers formed by both magnetron sputtering and in the PISCES-B linear device [6] showed that the D concentration decreased with increasing deposition rate and increasing temperature, and increased for increasing energy of the impinging particles.…”

Section: Introductionmentioning

confidence: 96%

“…[3] and references therein). However, only limited experimental investigations aimed at understanding hydrogen isotope retention in W layers deposited on collector probes due to sputtering of W targets with deuterium ions [4] and hydrogen and deuterium plasmas [5,6] have been performed. In experiments with 1.5 keV D ions no co-deposition of reflected deuterium with sputtered tungsten was observed at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Deuterium trapping in tungsten deposition layers formed by deuterium plasma sputtering

Alimov

Roth

Shu

et al. 2010

Journal of Nuclear Materials

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“…Therefore, hydrogen behavior in tungsten deposits is not necessarily the same as that in tungsten bulk. In order to investigate basic behaviors of hydrogen isotopes in tungsten deposits, the present authors have produced tungsten deposit samples by an RF plasma sputtering device [1][2][3][4]. It have been reported in previous papers that the produced tungsten deposits contain a numerous bubbles and retain a large amount of hydrogen isotopes [3].…”

Section: Introductionmentioning

confidence: 99%