Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector
At present, the CRAFT (Comprehensive Research Facility for Fusion Technology) dual-driver negative ion source for neutral beam injection applications has made progress. In order to solve the problem of heat removal function in large-area extraction grid, the multi-physics simulation, manufacturing a...
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Elsevier
2025-02-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573324004303 |
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| author | Jinhong Wang Yan Wang Yuwen Yang Yuming Gu Yahong Xie Lizhen Liang Jianglong Wei |
| author_facet | Jinhong Wang Yan Wang Yuwen Yang Yuming Gu Yahong Xie Lizhen Liang Jianglong Wei |
| author_sort | Jinhong Wang |
| collection | DOAJ |
| description | At present, the CRAFT (Comprehensive Research Facility for Fusion Technology) dual-driver negative ion source for neutral beam injection applications has made progress. In order to solve the problem of heat removal function in large-area extraction grid, the multi-physics simulation, manufacturing and testing are carried out. Two simulation conditions before Cs seeding (Je∼350 A/m2, JH-∼50 A/m2) and after sufficient Cs conditioning (Je∼150 A/m2, JH-∼250 A/m2) were considered to evaluate the power load on EG, which peak power density were 11 and 6 MW/m2 respectively and were concentrated on locate near the two aperture rows. This paper mainly studies three designs of minor cooling channels (double bending channels, double straight channels, and single straight channel). First, the grid temperature, thermal stress and thermal deformation are compared with an inlet water rate of 1.21 kg/s at 35 °C, and the channel forming methods and welding types mechanisms are compared. The simulation results show that the thermos-mechanical property of double bending channels is the best, and that of double straight channels is slightly worse. In terms of processing and manufacturing, the yield of double bending channels is lower than double straight channels, and it is easy to leak during the experiment. |
| format | Article |
| id | doaj-art-4aa99f7ccbdf46d49ec9d162eb1073c8 |
| institution | Kabale University |
| issn | 1738-5733 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj-art-4aa99f7ccbdf46d49ec9d162eb1073c82025-01-31T05:11:02ZengElsevierNuclear Engineering and Technology1738-57332025-02-01572103182Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injectorJinhong Wang0Yan Wang1Yuwen Yang2Yuming Gu3Yahong Xie4Lizhen Liang5Jianglong Wei6Anhui University of Science and Technology, Huainan, 232001, China; Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, ChinaAnhui University of Science and Technology, Huainan, 232001, China; Corresponding author.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, China; Corresponding author.Institute 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, ChinaAt present, the CRAFT (Comprehensive Research Facility for Fusion Technology) dual-driver negative ion source for neutral beam injection applications has made progress. In order to solve the problem of heat removal function in large-area extraction grid, the multi-physics simulation, manufacturing and testing are carried out. Two simulation conditions before Cs seeding (Je∼350 A/m2, JH-∼50 A/m2) and after sufficient Cs conditioning (Je∼150 A/m2, JH-∼250 A/m2) were considered to evaluate the power load on EG, which peak power density were 11 and 6 MW/m2 respectively and were concentrated on locate near the two aperture rows. This paper mainly studies three designs of minor cooling channels (double bending channels, double straight channels, and single straight channel). First, the grid temperature, thermal stress and thermal deformation are compared with an inlet water rate of 1.21 kg/s at 35 °C, and the channel forming methods and welding types mechanisms are compared. The simulation results show that the thermos-mechanical property of double bending channels is the best, and that of double straight channels is slightly worse. In terms of processing and manufacturing, the yield of double bending channels is lower than double straight channels, and it is easy to leak during the experiment.http://www.sciencedirect.com/science/article/pii/S1738573324004303Neutral beam injectionCRAFTNegative ion sourceExtraction grid |
| spellingShingle | Jinhong Wang Yan Wang Yuwen Yang Yuming Gu Yahong Xie Lizhen Liang Jianglong Wei Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector Nuclear Engineering and Technology Neutral beam injection CRAFT Negative ion source Extraction grid |
| title | Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector |
| title_full | Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector |
| title_fullStr | Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector |
| title_full_unstemmed | Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector |
| title_short | Optimization of a large-area grid electrode for negative ion source in fusion neutral beam injector |
| title_sort | optimization of a large area grid electrode for negative ion source in fusion neutral beam injector |
| topic | Neutral beam injection CRAFT Negative ion source Extraction grid |
| url | http://www.sciencedirect.com/science/article/pii/S1738573324004303 |
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