Effect of impurity deposition layer formation on D retention in LHD plasma exposed W
Effect of carbon based mixed-material deposition layer formation on hydrogen isotope retention was studied. The tungsten (W) samples were placed at four different positions, namely PI (sputtering erosion dominated area), DP (deposition dominated area), HL (higher heat load area), and ER (erosion dom...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-12-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179115300351 |
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| author | Y. Oya H. Fujita C. Hu Y. Uemura S. Sakurada K. Yuyama X. Li Y. Hatano N. Yoshida H. Watanabe Y. Nobuta Y. Yamauchi M. Tokitani S. Masuzaki T. Chikada |
| author_facet | Y. Oya H. Fujita C. Hu Y. Uemura S. Sakurada K. Yuyama X. Li Y. Hatano N. Yoshida H. Watanabe Y. Nobuta Y. Yamauchi M. Tokitani S. Masuzaki T. Chikada |
| author_sort | Y. Oya |
| collection | DOAJ |
| description | Effect of carbon based mixed-material deposition layer formation on hydrogen isotope retention was studied. The tungsten (W) samples were placed at four different positions, namely PI (sputtering erosion dominated area), DP (deposition dominated area), HL (higher heat load area), and ER (erosion dominated area) during 2013 plasma experimental campaign in Large Helical Device (LHD) at National Institute for Fusion Science (NIFS), Japan and were exposed to ∼ 4000 shots of hydrogen plasma in a 2013 plasma experimental campaign. Most of the sample surface except for ER was covered by a mixed-material deposition layer formed by plasma experimental campaign, which consisted of carbon, but some metal impurities were contained. For ER sample, He bubbles were formed due to long term He discharge cleaning and He plasma experiments during the plasma experimental campaign. The additional 1keV D2+ implantation was performed to evaluated the D retention enhancement by plasma exposure. It was found that both of H and D retentions were clearly increased. In particular, the H retention was controlled by the thickness of the carbon-dominated mixed-material deposition layer, indicating most of the H was trapped by this mixed-material deposition layer. It is concluded that the accumulation of low-Z mixed-material layer on the surface of the first wall is one of key issues for the determination of hydrogen isotope retention in first wall. |
| first_indexed | 2024-12-12T12:40:27Z |
| format | Article |
| id | doaj.art-a53e4f74ec444447853fcdc2906868bd |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-12T12:40:27Z |
| publishDate | 2016-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-a53e4f74ec444447853fcdc2906868bd2022-12-22T00:24:14ZengElsevierNuclear Materials and Energy2352-17912016-12-019C848810.1016/j.nme.2016.07.005Effect of impurity deposition layer formation on D retention in LHD plasma exposed WY. Oya0H. Fujita1C. Hu2Y. Uemura3S. Sakurada4K. Yuyama5X. Li6Y. Hatano7N. Yoshida8H. Watanabe9Y. Nobuta10Y. Yamauchi11M. Tokitani12S. Masuzaki13T. Chikada14Graduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanHydrogen Isotope Research Center, Organization for Promotion of Research, University of Toyama, Toyama, JapanInstitute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, JapanInstitute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, JapanGraduate School of Engineering, Hokkaido University, Sapporo, JapanGraduate School of Engineering, Hokkaido University, Sapporo, JapanDepartment of Helical Plasma Research, National Institute for Fusion Science, Toki, JapanDepartment of Helical Plasma Research, National Institute for Fusion Science, Toki, JapanGraduate School of Science, Shizuoka University, Shizuoka, JapanEffect of carbon based mixed-material deposition layer formation on hydrogen isotope retention was studied. The tungsten (W) samples were placed at four different positions, namely PI (sputtering erosion dominated area), DP (deposition dominated area), HL (higher heat load area), and ER (erosion dominated area) during 2013 plasma experimental campaign in Large Helical Device (LHD) at National Institute for Fusion Science (NIFS), Japan and were exposed to ∼ 4000 shots of hydrogen plasma in a 2013 plasma experimental campaign. Most of the sample surface except for ER was covered by a mixed-material deposition layer formed by plasma experimental campaign, which consisted of carbon, but some metal impurities were contained. For ER sample, He bubbles were formed due to long term He discharge cleaning and He plasma experiments during the plasma experimental campaign. The additional 1keV D2+ implantation was performed to evaluated the D retention enhancement by plasma exposure. It was found that both of H and D retentions were clearly increased. In particular, the H retention was controlled by the thickness of the carbon-dominated mixed-material deposition layer, indicating most of the H was trapped by this mixed-material deposition layer. It is concluded that the accumulation of low-Z mixed-material layer on the surface of the first wall is one of key issues for the determination of hydrogen isotope retention in first wall.http://www.sciencedirect.com/science/article/pii/S2352179115300351Hydrogen isotope retention enhancementMixed-material layerTEMTDSXPSLHD |
| spellingShingle | Y. Oya H. Fujita C. Hu Y. Uemura S. Sakurada K. Yuyama X. Li Y. Hatano N. Yoshida H. Watanabe Y. Nobuta Y. Yamauchi M. Tokitani S. Masuzaki T. Chikada Effect of impurity deposition layer formation on D retention in LHD plasma exposed W Nuclear Materials and Energy Hydrogen isotope retention enhancement Mixed-material layer TEM TDS XPS LHD |
| title | Effect of impurity deposition layer formation on D retention in LHD plasma exposed W |
| title_full | Effect of impurity deposition layer formation on D retention in LHD plasma exposed W |
| title_fullStr | Effect of impurity deposition layer formation on D retention in LHD plasma exposed W |
| title_full_unstemmed | Effect of impurity deposition layer formation on D retention in LHD plasma exposed W |
| title_short | Effect of impurity deposition layer formation on D retention in LHD plasma exposed W |
| title_sort | effect of impurity deposition layer formation on d retention in lhd plasma exposed w |
| topic | Hydrogen isotope retention enhancement Mixed-material layer TEM TDS XPS LHD |
| url | http://www.sciencedirect.com/science/article/pii/S2352179115300351 |
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