Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel
In future fusion reactors, the first wall will be irradiated with hydrogen fuel (deuterium (D), tritium (T)) and helium (He) with low energies. In this work, the effects of He plasma irradiation on D permeation through tungsten (W) coated reduced activation ferritic/martensitic (RAFM) steel were sys...
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/adaa00 |
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| author | Yue Xu Xiao-Ping Tian Hong-Yan Tan Hai-Ying Fu Jun-Jie Ni Lai-Ma Luo Yu-Cheng Wu |
| author_facet | Yue Xu Xiao-Ping Tian Hong-Yan Tan Hai-Ying Fu Jun-Jie Ni Lai-Ma Luo Yu-Cheng Wu |
| author_sort | Yue Xu |
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| description | In future fusion reactors, the first wall will be irradiated with hydrogen fuel (deuterium (D), tritium (T)) and helium (He) with low energies. In this work, the effects of He plasma irradiation on D permeation through tungsten (W) coated reduced activation ferritic/martensitic (RAFM) steel were systematically investigated by performing plasma-driven permeation (PDP) measurements in the temperature range of 523–833 K. The W coatings were prepared by magnetron sputtering. He plasma irradiation with different fluences was carried out in a linear plasma device. The results showed that as He irradiation fluence increased, the surface damage of W coatings intensified, resulting in a high steady-state D-PDP flux and effective diffusion coefficient. The effect of incident ion energy on D-PDP was also influenced by He pre-irradiation. After He irradiation with a fluence of 6.0 × 10 ^24 He m ^−2 , the D-PDP flux was found to decrease with increasing incident ion energy despite the fact that the sample temperature was gradually increasing. The He pre-damage affected the overall D transport by re-balancing the bulk diffusion and surface recombination processes, therefore determining the PDP flux. D-PDP through W + RAFM under simultaneous D + He mixture plasma exposure was studied as well. The results indicated that the presence of He reduced the ionization rate of the D plasma and decreased D-PDP flux. D-PDP regime under the mixture plasma exposure was verified by calculating the transport parameter. It was found that the D-PDP regime was not changed by He introduction, which remained in the RD regime (recombination-limited D release from upstream surface and diffusion-limited D release from downstream surface). |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | Nuclear Fusion |
| spelling | doaj-art-80fad3ffe52c4970b5944925c61b67a32025-01-28T12:21:16ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202605610.1088/1741-4326/adaa00Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steelYue Xu0https://orcid.org/0000-0001-5010-5044Xiao-Ping Tian1Hong-Yan Tan2Hai-Ying Fu3Jun-Jie Ni4Lai-Ma Luo5https://orcid.org/0000-0002-4455-7391Yu-Cheng Wu6School of Materials Science and Engineering, Hefei University of Technology , Hefei 230009, China; Copper Alloy and Forming Engineering Research Center of Ministry of Education , Hefei 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology , Hefei 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology , Hefei 230009, ChinaCenter for Fusion Science, Southwestern Institute of Physics , Chengdu 610225, ChinaSchool of Materials Science and Engineering, Liaocheng University , Liaocheng 252000, ChinaSchool of Materials Science and Engineering, Hefei University of Technology , Hefei 230009, China; Copper Alloy and Forming Engineering Research Center of Ministry of Education , Hefei 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology , Hefei 230009, China; Copper Alloy and Forming Engineering Research Center of Ministry of Education , Hefei 230009, ChinaIn future fusion reactors, the first wall will be irradiated with hydrogen fuel (deuterium (D), tritium (T)) and helium (He) with low energies. In this work, the effects of He plasma irradiation on D permeation through tungsten (W) coated reduced activation ferritic/martensitic (RAFM) steel were systematically investigated by performing plasma-driven permeation (PDP) measurements in the temperature range of 523–833 K. The W coatings were prepared by magnetron sputtering. He plasma irradiation with different fluences was carried out in a linear plasma device. The results showed that as He irradiation fluence increased, the surface damage of W coatings intensified, resulting in a high steady-state D-PDP flux and effective diffusion coefficient. The effect of incident ion energy on D-PDP was also influenced by He pre-irradiation. After He irradiation with a fluence of 6.0 × 10 ^24 He m ^−2 , the D-PDP flux was found to decrease with increasing incident ion energy despite the fact that the sample temperature was gradually increasing. The He pre-damage affected the overall D transport by re-balancing the bulk diffusion and surface recombination processes, therefore determining the PDP flux. D-PDP through W + RAFM under simultaneous D + He mixture plasma exposure was studied as well. The results indicated that the presence of He reduced the ionization rate of the D plasma and decreased D-PDP flux. D-PDP regime under the mixture plasma exposure was verified by calculating the transport parameter. It was found that the D-PDP regime was not changed by He introduction, which remained in the RD regime (recombination-limited D release from upstream surface and diffusion-limited D release from downstream surface).https://doi.org/10.1088/1741-4326/adaa00irradiation damagedeuteriumplasma-driven permeationtungsten coatingRAFM steel |
| spellingShingle | Yue Xu Xiao-Ping Tian Hong-Yan Tan Hai-Ying Fu Jun-Jie Ni Lai-Ma Luo Yu-Cheng Wu Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel Nuclear Fusion irradiation damage deuterium plasma-driven permeation tungsten coating RAFM steel |
| title | Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel |
| title_full | Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel |
| title_fullStr | Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel |
| title_full_unstemmed | Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel |
| title_short | Effects of helium irradiation damage on deuterium plasma-driven permeation through tungsten coated RAFM steel |
| title_sort | effects of helium irradiation damage on deuterium plasma driven permeation through tungsten coated rafm steel |
| topic | irradiation damage deuterium plasma-driven permeation tungsten coating RAFM steel |
| url | https://doi.org/10.1088/1741-4326/adaa00 |
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