Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics
Magnetic-dipole (M1) lines of W29+~W39+ were successfully observed in the vacuum-ultraviolet (VUV) wavelength range of 500–900 Å in the Large Helical Device (LHD). Tungsten ions are distributed in the NBI-heated LHD plasma by injecting a pellet consisting of a small piece of tungsten metal wire encl...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179121000260 |
| _version_ | 1818870783269666816 |
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| author | Tetsutarou Oishi Shigeru Morita Daiji Kato Izumi Murakami Hiroyuki A. Sakaue Yasuko Kawamoto Motoshi Goto the LHD Experiment Group |
| author_facet | Tetsutarou Oishi Shigeru Morita Daiji Kato Izumi Murakami Hiroyuki A. Sakaue Yasuko Kawamoto Motoshi Goto the LHD Experiment Group |
| author_sort | Tetsutarou Oishi |
| collection | DOAJ |
| description | Magnetic-dipole (M1) lines of W29+~W39+ were successfully observed in the vacuum-ultraviolet (VUV) wavelength range of 500–900 Å in the Large Helical Device (LHD). Tungsten ions are distributed in the NBI-heated LHD plasma by injecting a pellet consisting of a small piece of tungsten metal wire enclosed by a carbon tube. It is found that W37+ line at 646.7 Å and W38+ lines at 532.9 Å and 559.1 Å are emitted when the central electron temperature ranges from 2 to 3 keV with relatively high intensity and isolated from other intrinsic impurity lines. The result is the first observation of the M1 forbidden lines of tungsten ions in the VUV wavelength range in fusion plasma experiments. Observation of the W37+ and W38+ lines could improve the tungsten diagnostics in ITER edge plasmas because they are expected to be distributed in the edge plasmas around the last closed flux surface including the scrape-off layer in ITER. |
| first_indexed | 2024-12-19T12:12:30Z |
| format | Article |
| id | doaj.art-5b57d5df2afd489cb644b7cddd161d2b |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-19T12:12:30Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-5b57d5df2afd489cb644b7cddd161d2b2022-12-21T20:22:09ZengElsevierNuclear Materials and Energy2352-17912021-03-0126100932Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnosticsTetsutarou Oishi0Shigeru Morita1Daiji Kato2Izumi Murakami3Hiroyuki A. Sakaue4Yasuko Kawamoto5Motoshi Goto6 the LHD Experiment Group7National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Corresponding author at: National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan.National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Department of Advanced Energy Engineering Science, Kyushu University, Kasuga 816-8580, Fukuoka, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, Japan; Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Gifu, JapanMagnetic-dipole (M1) lines of W29+~W39+ were successfully observed in the vacuum-ultraviolet (VUV) wavelength range of 500–900 Å in the Large Helical Device (LHD). Tungsten ions are distributed in the NBI-heated LHD plasma by injecting a pellet consisting of a small piece of tungsten metal wire enclosed by a carbon tube. It is found that W37+ line at 646.7 Å and W38+ lines at 532.9 Å and 559.1 Å are emitted when the central electron temperature ranges from 2 to 3 keV with relatively high intensity and isolated from other intrinsic impurity lines. The result is the first observation of the M1 forbidden lines of tungsten ions in the VUV wavelength range in fusion plasma experiments. Observation of the W37+ and W38+ lines could improve the tungsten diagnostics in ITER edge plasmas because they are expected to be distributed in the edge plasmas around the last closed flux surface including the scrape-off layer in ITER.http://www.sciencedirect.com/science/article/pii/S2352179121000260Plasma spectroscopyVacuum ultravioletMagnetically confined fusionImpurity transportHighly ionized tungsten ionsMagnetic-dipole transition |
| spellingShingle | Tetsutarou Oishi Shigeru Morita Daiji Kato Izumi Murakami Hiroyuki A. Sakaue Yasuko Kawamoto Motoshi Goto the LHD Experiment Group Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics Nuclear Materials and Energy Plasma spectroscopy Vacuum ultraviolet Magnetically confined fusion Impurity transport Highly ionized tungsten ions Magnetic-dipole transition |
| title | Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics |
| title_full | Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics |
| title_fullStr | Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics |
| title_full_unstemmed | Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics |
| title_short | Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics |
| title_sort | identification of forbidden emission lines from highly ionized tungsten ions in vuv wavelength range in lhd for iter edge plasma diagnostics |
| topic | Plasma spectroscopy Vacuum ultraviolet Magnetically confined fusion Impurity transport Highly ionized tungsten ions Magnetic-dipole transition |
| url | http://www.sciencedirect.com/science/article/pii/S2352179121000260 |
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