Temperature dependence of deuterium retention in tungsten deposits by deuterium ion irradiation

Katayama, Kazunari; Uehara, Kazuko; Date, H.; Fukada, Satoshi; Watanabe, Hideo

doi:10.1016/j.jnucmat.2014.11.103

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…However, since the same trend was not noticed for the rest of the layers this is by no means a clear evidence of bias influence upon D retention. Furthermore, the high D retention values obtained in our study for W coatings are similar with the ones found in literature for W layers co-deposited at low temperatures (~300 K) with D using magnetron sputtering [30][31][32] and also with plasma spray W coatings exposed to low energy D plasma [33]. However, the retention levels are higher compared to studies performed on W coatings and polycrystalline W foils exposed to D ions at low fluences, where typical D/W ratio is lower than 0.01.…”

Section: Deuterium Desorption Characteristicssupporting

confidence: 91%

“…However, the retention levels are higher compared to studies performed on W coatings and polycrystalline W foils exposed to D ions at low fluences, where typical D/W ratio is lower than 0.01. A specific example that can argue this case is provided by a study performed by K. Katayama et all [30] where 1 µm thick W coatings obtained through RF magnetron sputtering where exposed to low fluence 2 * 10 21 D m −2 , high energy (1 keV/D + ) D ions for a time period of 1 h. The resulted retention at room temperature was lower with a factor 5 in comparison with the W layer deposited at −700 V. The high D retention values in W in our study were similar with the ones encountered in a study performed by V.Kh. Alimov et all [34] where the authors exposed polycrystalline W foils to D ions with an energy of 200 eV/D + and the results showed a surface retention in the 1%-5% range.…”

Section: Deuterium Desorption Characteristicsmentioning

confidence: 99%

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Structure, morphology and deuterium retention and release properties of pure and mixed Be and W layers

Dincă

Butoi

Poroşnicu

et al. 2020

J. Phys. D: Appl. Phys.

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Deuterium retention and release behavior were investigated in this study, for beryllium, tungsten and mixed beryllium/tungsten thin layers which are of concern for next-generation thermonuclear fusion devices like International Thermonuclear Experimental Reactor. The layers prepared with thermionic vacuum arc technology by using two different ion acceleration voltages 0 V and −700 V respectively were subsequently implanted by exposure to a steady-state deuterium plasma with ion energies of 240 eV/D for D 3 and 360 eV/D for D 2 at a specific fluency of 2.85 × 10 20 m −2 s. Morphology is strongly influenced by layer composition and by the ion acceleration voltage applied in-situ during layer deposition. Crystalline structure analysis shows the presence of a polycrystalline W metallic phase and also highlights a dependence between tungsten crystallite size and Be/W atomic ratio. The amount of deuterium in mixed layers is lower than in pure beryllium layers indicating that W is mitigating D binding states. Results extrapolated for a 'cold chamber and divertor scenario' indicate a limited desorption efficiency (~20%), if the wall baking scenario, for tritium removal procedure in ITER, is to be applied to the investigated layers.

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Section: Deuterium Desorption Characteristicssupporting

confidence: 91%

Section: Deuterium Desorption Characteristicsmentioning

confidence: 99%

Structure, morphology and deuterium retention and release properties of pure and mixed Be and W layers

Dincă

Butoi

Poroşnicu

et al. 2020

J. Phys. D: Appl. Phys.

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“…For hydrogen in bulk tungsten at 500 K, the recombination rate coefficients 10 -29 -10 -31 m 4 /s have been determined by many researchers. In the described below works [10,14,27,28,36,37,[39][40][41][42][43][44][45][46][47][48][49][50][51] much attention has been paid to the processes of retention and release of hydrogen isotopes in tungsten coatings proposed as protect for components facing the plasma (the first wall, divertor, antenna mirrors).…”

Section: Results and Discussion Hydrogen (Deuterium) Implantation Ret...mentioning

confidence: 99%

“…Katayama at al. prepared tungsten coatings on W substrates at 294 K and 773 K by hydrogen radio-frequency (RF) plasma sputtering of W targets [44]. The thickness and density of the W coatings were 970 nm and 10 kkg/m 3 on average, respectively.…”

Section: Eejp 1 (2024)mentioning

confidence: 99%

Investigation of the Processes of Retention and Release of Implanted Deuterium and Helium Ions for Tungsten and Tantalum Coatings

Azarenkov,

Bobkov,

Tishchenko

et al. 2024

East Eur. J. Phys.

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The analysis of main published results of studies of retention and migration of ion-implanted hydrogen isotopes and helium in tungsten and tantalum coatings, formation of radiation damages of the crystal lattice and their interaction with implanted gases, as well as the influence of helium and deuterium on various properties and surface morphology of coatings was carried out. The irradiation of samples was performed by beams of accelerated ions of hydrogen isotopes or He+, and in a plasma containing these ions, at various fluences and energies of incident ions, and at various temperatures of targets during implantation. Special attention was paid to the research results obtained at simultaneous irradiation of W both in bulk and in thin-film form. The used methods were electron microscopy, reemission mass spectrometry, thermal desorption spectrometry, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear reaction analysis and Rutherford ion scattering.

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“…Only a small number of works were performed using the sequential implantation of those ions [8,[13][14][15][16][17][18]. The researches concerning the processes that accompany the implantation of D + or He + ions into vacuum-deposited tungsten coatings and the behav-ior of deuterium and helium in them are not numerous [19][20][21][22][23][24][25][26]. Moreover, no results of researches with the sequential implantation of those ions into the indicated coatings were found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Implantation of Deuterium and Helium Ions into a Tungsten-Coated Composite Structures

Bobkov¹,

Tishchenko²,

Kovtunenko³

et al. 2020

Ukr. J. Phys.

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The capture, retention, and thermal desorption of deuterium and helium ions with medium energies implanted into tungsten-coated multilayer functional structures and the formation of corresponding radiation-induced damages in the crystal lattice of the tungsten coatings of those structures have been studied making use of the thermal desorption spectroscopy and electron microscopy methods. The behavior of deuterium and helium in the examined materials and its dependence on the post-implantation heating temperature, the dose of irradiation with D+ and He+ ions, and the irradiation condition – separate (making use of ions of only one kind) or sequential (making use of ions of both kinds) – are analyzed. A classification of radiation-induced defects and mechanisms of their annealing are proposed.

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Temperature dependence of deuterium retention in tungsten deposits by deuterium ion irradiation

Cited by 9 publications

References 13 publications

Structure, morphology and deuterium retention and release properties of pure and mixed Be and W layers

Structure, morphology and deuterium retention and release properties of pure and mixed Be and W layers

Investigation of the Processes of Retention and Release of Implanted Deuterium and Helium Ions for Tungsten and Tantalum Coatings

Implantation of Deuterium and Helium Ions into a Tungsten-Coated Composite Structures

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