Observations on arcing on the metal plasma-facing components in EAST
Arcing on the plasma-facing components (PFCs) is one of the mechanisms of material erosion and impurity production in the magnetic-confinement fusion devices. EAST tokamak has been upgraded to almost full metal PFCs. The arcing phenomena in EAST has special features due to the lithium coating and th...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179122001995 |
| _version_ | 1811154388860796928 |
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| author | Baoguo Wang Dahuan Zhu Rui Ding Binfu Gao Rong Yan Changjun Li Chuannan Xuan Baixue Yu Junling Chen |
| author_facet | Baoguo Wang Dahuan Zhu Rui Ding Binfu Gao Rong Yan Changjun Li Chuannan Xuan Baixue Yu Junling Chen |
| author_sort | Baoguo Wang |
| collection | DOAJ |
| description | Arcing on the plasma-facing components (PFCs) is one of the mechanisms of material erosion and impurity production in the magnetic-confinement fusion devices. EAST tokamak has been upgraded to almost full metal PFCs. The arcing phenomena in EAST has special features due to the lithium coating and the RF heating. Post-mortem analysis of arc traces is performed on both plasma-wetted components and PFCs in sub-limiter remote areas. The arcs in sub-limiter remote areas nearly have no influence on the normal discharges as most of them were produced during the glow discharge cleaning. But some arcs on the first mirrors of infrared and visible tangential wide-angle viewing systems in EAST can form patterned traces in the videos, which affects the precision of temperature measurements and visible imaging quality. The arcs on plasma-wetted components were mainly observed at two locations: the tungsten upper divertor and the lower hybrid current drive (LHCD) antennas. The random-walk arc traces on the surface of the upper tungsten divertor are limited to a very small area and most probably formed without magnetic field during glow discharge, unable to influence plasma discharges so far, and still need long-term tracking. The arcs on the LHCD antenna surface can be sustained for more than hundreds of milliseconds, and produce large numbers of impurity particles and molten droplets, which can result in plasma current quench and disruption, and the effects of arcing on LHCD heating mode and power should be further studied. |
| first_indexed | 2024-04-10T04:14:45Z |
| format | Article |
| id | doaj.art-43ec2eae40cd4a75ab8894f5f5645706 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-04-10T04:14:45Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-43ec2eae40cd4a75ab8894f5f56457062023-03-12T04:21:18ZengElsevierNuclear Materials and Energy2352-17912023-03-0134101318Observations on arcing on the metal plasma-facing components in EASTBaoguo Wang0Dahuan Zhu1Rui Ding2Binfu Gao3Rong Yan4Changjun Li5Chuannan Xuan6Baixue Yu7Junling Chen8Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; Corresponding authors.Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; Corresponding authors.Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, ChinaTibet University, Lhasa 850000, ChinaInstitute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaArcing on the plasma-facing components (PFCs) is one of the mechanisms of material erosion and impurity production in the magnetic-confinement fusion devices. EAST tokamak has been upgraded to almost full metal PFCs. The arcing phenomena in EAST has special features due to the lithium coating and the RF heating. Post-mortem analysis of arc traces is performed on both plasma-wetted components and PFCs in sub-limiter remote areas. The arcs in sub-limiter remote areas nearly have no influence on the normal discharges as most of them were produced during the glow discharge cleaning. But some arcs on the first mirrors of infrared and visible tangential wide-angle viewing systems in EAST can form patterned traces in the videos, which affects the precision of temperature measurements and visible imaging quality. The arcs on plasma-wetted components were mainly observed at two locations: the tungsten upper divertor and the lower hybrid current drive (LHCD) antennas. The random-walk arc traces on the surface of the upper tungsten divertor are limited to a very small area and most probably formed without magnetic field during glow discharge, unable to influence plasma discharges so far, and still need long-term tracking. The arcs on the LHCD antenna surface can be sustained for more than hundreds of milliseconds, and produce large numbers of impurity particles and molten droplets, which can result in plasma current quench and disruption, and the effects of arcing on LHCD heating mode and power should be further studied.http://www.sciencedirect.com/science/article/pii/S2352179122001995EASTArcingPlasma-facing componentsLHCD antennasImpurities |
| spellingShingle | Baoguo Wang Dahuan Zhu Rui Ding Binfu Gao Rong Yan Changjun Li Chuannan Xuan Baixue Yu Junling Chen Observations on arcing on the metal plasma-facing components in EAST Nuclear Materials and Energy EAST Arcing Plasma-facing components LHCD antennas Impurities |
| title | Observations on arcing on the metal plasma-facing components in EAST |
| title_full | Observations on arcing on the metal plasma-facing components in EAST |
| title_fullStr | Observations on arcing on the metal plasma-facing components in EAST |
| title_full_unstemmed | Observations on arcing on the metal plasma-facing components in EAST |
| title_short | Observations on arcing on the metal plasma-facing components in EAST |
| title_sort | observations on arcing on the metal plasma facing components in east |
| topic | EAST Arcing Plasma-facing components LHCD antennas Impurities |
| url | http://www.sciencedirect.com/science/article/pii/S2352179122001995 |
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