Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers
The release of deuterium from sputter magnetron produced tungsten co-deposit layers is studied by thermal desorption mass spectrometry and modelled with the diffusion reaction codes TESSIM and FACE. Layers up to ∼ 2 µm thick, produced at substrate deposition temperatures up to 513 K are modeled. TE...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-05-01
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| Series: | Nuclear Materials and Energy |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179120300193 |
| _version_ | 1818342339561652224 |
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| author | M.J. Baldwin A. Založnik R.D. Smirnov R.P. Doerner |
| author_facet | M.J. Baldwin A. Založnik R.D. Smirnov R.P. Doerner |
| author_sort | M.J. Baldwin |
| collection | DOAJ |
| description | The release of deuterium from sputter magnetron produced tungsten co-deposit layers is studied by thermal desorption mass spectrometry and modelled with the diffusion reaction codes TESSIM and FACE. Layers up to ∼ 2 µm thick, produced at substrate deposition temperatures up to 513 K are modeled. TESSIM simulations are found to require activity from at least nine traps in the range 1.0−2.5 eV in order to reproduce the experimentally observed desorption. FACE simulations, which utilize a quasi-continuous distribution of traps, suggest some discreteness in trapping energy above ∼ 1.5 eV, but smoothness in the distribution below. Both codes indicate a quasi-exponential decrease in trap concentration with trap energy. When examined for predictive capability, the developed tungsten co-deposit models accurately reproduce experimental changes in the desorption heating rate from 0.3 to 3 Ks−1, and give reasonable agreement with experimentally different layer thicknesses and deposition temperatures in the parameter ranges explored. Measured D/W ratios in the co-deposits are also found to be in good agreement with literature based predictive scalings. |
| first_indexed | 2024-12-13T16:13:07Z |
| format | Article |
| id | doaj.art-a133a3d757384fd288d15cf835014b02 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-13T16:13:07Z |
| publishDate | 2020-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-a133a3d757384fd288d15cf835014b022022-12-21T23:38:53ZengElsevierNuclear Materials and Energy2352-17912020-05-0123Experimental measurements and modeling of the deuterium release from tungsten co-deposited layersM.J. Baldwin0A. Založnik1R.D. Smirnov2R.P. Doerner3Corresponding author.; Center for Energy Research, University of California at San Diego, 9500 Gilman Dr, La Jolla, CA, 92093-0417, USACenter for Energy Research, University of California at San Diego, 9500 Gilman Dr, La Jolla, CA, 92093-0417, USACenter for Energy Research, University of California at San Diego, 9500 Gilman Dr, La Jolla, CA, 92093-0417, USACenter for Energy Research, University of California at San Diego, 9500 Gilman Dr, La Jolla, CA, 92093-0417, USAThe release of deuterium from sputter magnetron produced tungsten co-deposit layers is studied by thermal desorption mass spectrometry and modelled with the diffusion reaction codes TESSIM and FACE. Layers up to ∼ 2 µm thick, produced at substrate deposition temperatures up to 513 K are modeled. TESSIM simulations are found to require activity from at least nine traps in the range 1.0−2.5 eV in order to reproduce the experimentally observed desorption. FACE simulations, which utilize a quasi-continuous distribution of traps, suggest some discreteness in trapping energy above ∼ 1.5 eV, but smoothness in the distribution below. Both codes indicate a quasi-exponential decrease in trap concentration with trap energy. When examined for predictive capability, the developed tungsten co-deposit models accurately reproduce experimental changes in the desorption heating rate from 0.3 to 3 Ks−1, and give reasonable agreement with experimentally different layer thicknesses and deposition temperatures in the parameter ranges explored. Measured D/W ratios in the co-deposits are also found to be in good agreement with literature based predictive scalings.http://www.sciencedirect.com/science/article/pii/S2352179120300193TungstenCo-depositsRetentionThermal DesorptionPisces |
| spellingShingle | M.J. Baldwin A. Založnik R.D. Smirnov R.P. Doerner Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers Nuclear Materials and Energy Tungsten Co-deposits Retention Thermal Desorption Pisces |
| title | Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers |
| title_full | Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers |
| title_fullStr | Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers |
| title_full_unstemmed | Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers |
| title_short | Experimental measurements and modeling of the deuterium release from tungsten co-deposited layers |
| title_sort | experimental measurements and modeling of the deuterium release from tungsten co deposited layers |
| topic | Tungsten Co-deposits Retention Thermal Desorption Pisces |
| url | http://www.sciencedirect.com/science/article/pii/S2352179120300193 |
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