Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure
Abstract Nano-tendril bundles (NTBs) are clusters of fuzzy nanostructures that form on tungsten surfaces when they are exposed to helium plasmas under specific conditions, reaching lengths of over 100 µm. Tungsten samples with NTBs and fuzz were exposed to high-density hydrogen plasmas in the Upgrad...
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Nature Portfolio
2025-03-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-92412-y |
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| author | Dogyun Hwangbo Shuangyuan Feng Shin Kajita Hirohiko Tanaka Rongshi Zhang Yuki Hayashi Maria Morbey Remco Timmer Jordy Vernimmen John Scholten Thomas Morgan |
| author_facet | Dogyun Hwangbo Shuangyuan Feng Shin Kajita Hirohiko Tanaka Rongshi Zhang Yuki Hayashi Maria Morbey Remco Timmer Jordy Vernimmen John Scholten Thomas Morgan |
| author_sort | Dogyun Hwangbo |
| collection | DOAJ |
| description | Abstract Nano-tendril bundles (NTBs) are clusters of fuzzy nanostructures that form on tungsten surfaces when they are exposed to helium plasmas under specific conditions, reaching lengths of over 100 µm. Tungsten samples with NTBs and fuzz were exposed to high-density hydrogen plasmas in the Upgraded Pilot-PSI linear plasma device to investigate their response, with a particular focus on unipolar arc ignition and hot spot formation. Although NTBs are prone to arcing due to their high field electron emission characteristics, unipolar arcs have never occurred on NTBs. Post-mortem analysis showed that the heights of the NTBs changed significantly during irradiation mainly due to rapid heating, and that these changes strongly influenced their interaction with high-density plasmas. |
| format | Article |
| id | doaj-art-b506f9e4e6b846d5a188d12b56a963ab |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-b506f9e4e6b846d5a188d12b56a963ab2025-08-20T02:59:22ZengNature PortfolioScientific Reports2045-23222025-03-0115111410.1038/s41598-025-92412-yFormation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposureDogyun Hwangbo0Shuangyuan Feng1Shin Kajita2Hirohiko Tanaka3Rongshi Zhang4Yuki Hayashi5Maria Morbey6Remco Timmer7Jordy Vernimmen8John Scholten9Thomas Morgan10Institute of Pure and Applied Sciences, University of TsukubaDivision of Electrical, Electronic and Information Engineering, Yamaguchi UniversityGraduate School of Frontier Sciences, University of TokyoGraduate School of Engineering, Nagoya UniversityGraduate School of Engineering, Nagoya UniversityGraduate School of Frontier Sciences, University of TokyoDIFFER - Dutch Institute for Fundamental Energy ResearchDIFFER - Dutch Institute for Fundamental Energy ResearchDIFFER - Dutch Institute for Fundamental Energy ResearchDIFFER - Dutch Institute for Fundamental Energy ResearchDIFFER - Dutch Institute for Fundamental Energy ResearchAbstract Nano-tendril bundles (NTBs) are clusters of fuzzy nanostructures that form on tungsten surfaces when they are exposed to helium plasmas under specific conditions, reaching lengths of over 100 µm. Tungsten samples with NTBs and fuzz were exposed to high-density hydrogen plasmas in the Upgraded Pilot-PSI linear plasma device to investigate their response, with a particular focus on unipolar arc ignition and hot spot formation. Although NTBs are prone to arcing due to their high field electron emission characteristics, unipolar arcs have never occurred on NTBs. Post-mortem analysis showed that the heights of the NTBs changed significantly during irradiation mainly due to rapid heating, and that these changes strongly influenced their interaction with high-density plasmas.https://doi.org/10.1038/s41598-025-92412-yUnipolar arcingDivertorHot spotNanostructureTungsten |
| spellingShingle | Dogyun Hwangbo Shuangyuan Feng Shin Kajita Hirohiko Tanaka Rongshi Zhang Yuki Hayashi Maria Morbey Remco Timmer Jordy Vernimmen John Scholten Thomas Morgan Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure Scientific Reports Unipolar arcing Divertor Hot spot Nanostructure Tungsten |
| title | Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure |
| title_full | Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure |
| title_fullStr | Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure |
| title_full_unstemmed | Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure |
| title_short | Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure |
| title_sort | formation of hot spots and arc ignition on tungsten with nano tendril bundles under high density hydrogen plasma exposure |
| topic | Unipolar arcing Divertor Hot spot Nanostructure Tungsten |
| url | https://doi.org/10.1038/s41598-025-92412-y |
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