Towards detachment-compatible I-mode plasma on EAST tokamak
The divertor detachment is important for the improved confinement mode (I-mode) to serve as a reliable operating scenario in future fusion reactors. A reproducible steady-state I-mode operation with the energy detachment of the inner target has been achieved with the lower single-null configuration...
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| Format: | Article |
| Language: | English |
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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/addc80 |
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| author | L. Yu L. Wang X.L. Zou X. Lin L.Y. Meng Q.Q. Yang X.M. Zhong L.Q. Xu A.D. Liu R.R. Liang Z.Q. Zhou K.D. Li Q. Zang L. Zhang T.F. Zhou Y.M. Duan Y.F. Jin T.Q. Jia M.R. Wang H.Q. Liu B. Zhang G.S. Xu Z.X. Liu Y.T. Song EAST I-mode Working Group the EAST Team |
| author_facet | L. Yu L. Wang X.L. Zou X. Lin L.Y. Meng Q.Q. Yang X.M. Zhong L.Q. Xu A.D. Liu R.R. Liang Z.Q. Zhou K.D. Li Q. Zang L. Zhang T.F. Zhou Y.M. Duan Y.F. Jin T.Q. Jia M.R. Wang H.Q. Liu B. Zhang G.S. Xu Z.X. Liu Y.T. Song EAST I-mode Working Group the EAST Team |
| author_sort | L. Yu |
| collection | DOAJ |
| description | The divertor detachment is important for the improved confinement mode (I-mode) to serve as a reliable operating scenario in future fusion reactors. A reproducible steady-state I-mode operation with the energy detachment of the inner target has been achieved with the lower single-null configuration on the Experimental Advanced Superconducting Tokamak (EAST). Compared to the high confinement mode (H-mode), I-mode has a lower electron temperature on the inner divertor target and can achieve energy detachment at a lower density. In addition, dedicated experiments on neon (Ne) seeding to assist the exhaust of steady-state heat flux in I-mode discharges have also been successfully carried out on EAST. A significant reduction of the particle flux caused by the Ne impurity radiation was observed at both inner and outer divertor targets without I-L back-transition on EAST for the first time. This may be due to the ‘corner effect’ of the EAST right-angled divertor with a high divertor closure, which can effectively trap the impurity particles and thus reduce the influence of impurity on the main plasma. Furthermore, good core-edge compatibility was also obtained in the detached I-mode plasma with a radiative divertor. This study offers an attractive scenario of I-mode operation for avoiding excessively high transient and steady-state heat loads simultaneously in future fusion reactors. |
| format | Article |
| id | doaj-art-adedd212f94e4839b4d93a8056b6a56d |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-adedd212f94e4839b4d93a8056b6a56d2025-08-20T03:26:29ZengIOP PublishingNuclear Fusion0029-55152025-01-0165707600510.1088/1741-4326/addc80Towards detachment-compatible I-mode plasma on EAST tokamakL. Yu0L. Wang1https://orcid.org/0000-0002-8373-117XX.L. Zou2X. Lin3https://orcid.org/0000-0003-4540-3017L.Y. Meng4https://orcid.org/0000-0002-8633-5383Q.Q. Yang5https://orcid.org/0000-0002-6354-1408X.M. Zhong6https://orcid.org/0000-0002-1751-111XL.Q. Xu7https://orcid.org/0000-0002-7388-6055A.D. Liu8https://orcid.org/0000-0002-3164-7320R.R. Liang9https://orcid.org/0000-0002-1419-0234Z.Q. Zhou10K.D. Li11https://orcid.org/0000-0003-0486-7368Q. Zang12L. Zhang13T.F. Zhou14Y.M. Duan15Y.F. Jin16https://orcid.org/0000-0002-3061-6709T.Q. Jia17https://orcid.org/0000-0001-9797-6904M.R. Wang18H.Q. Liu19https://orcid.org/0000-0001-6892-358XB. Zhang20https://orcid.org/0000-0003-0304-2372G.S. Xu21https://orcid.org/0000-0001-8495-8678Z.X. Liu22Y.T. Song23EAST I-mode Working Groupthe EAST TeamInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaCEA, IRFM , F-13108 St Paul Les Durance, FranceInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaCollege of Physics and Optoelectronic Engineering, Shenzhen University , Shenzhen 518060, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, ChinaYulin Normal University , Yulin 537000, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, ChinaInstitute of Plasma Physics, Hefei Institute of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaThe divertor detachment is important for the improved confinement mode (I-mode) to serve as a reliable operating scenario in future fusion reactors. A reproducible steady-state I-mode operation with the energy detachment of the inner target has been achieved with the lower single-null configuration on the Experimental Advanced Superconducting Tokamak (EAST). Compared to the high confinement mode (H-mode), I-mode has a lower electron temperature on the inner divertor target and can achieve energy detachment at a lower density. In addition, dedicated experiments on neon (Ne) seeding to assist the exhaust of steady-state heat flux in I-mode discharges have also been successfully carried out on EAST. A significant reduction of the particle flux caused by the Ne impurity radiation was observed at both inner and outer divertor targets without I-L back-transition on EAST for the first time. This may be due to the ‘corner effect’ of the EAST right-angled divertor with a high divertor closure, which can effectively trap the impurity particles and thus reduce the influence of impurity on the main plasma. Furthermore, good core-edge compatibility was also obtained in the detached I-mode plasma with a radiative divertor. This study offers an attractive scenario of I-mode operation for avoiding excessively high transient and steady-state heat loads simultaneously in future fusion reactors.https://doi.org/10.1088/1741-4326/addc80I-modedivertor detachmentneon seedingclosed divertorEAST tokamak |
| spellingShingle | L. Yu L. Wang X.L. Zou X. Lin L.Y. Meng Q.Q. Yang X.M. Zhong L.Q. Xu A.D. Liu R.R. Liang Z.Q. Zhou K.D. Li Q. Zang L. Zhang T.F. Zhou Y.M. Duan Y.F. Jin T.Q. Jia M.R. Wang H.Q. Liu B. Zhang G.S. Xu Z.X. Liu Y.T. Song EAST I-mode Working Group the EAST Team Towards detachment-compatible I-mode plasma on EAST tokamak Nuclear Fusion I-mode divertor detachment neon seeding closed divertor EAST tokamak |
| title | Towards detachment-compatible I-mode plasma on EAST tokamak |
| title_full | Towards detachment-compatible I-mode plasma on EAST tokamak |
| title_fullStr | Towards detachment-compatible I-mode plasma on EAST tokamak |
| title_full_unstemmed | Towards detachment-compatible I-mode plasma on EAST tokamak |
| title_short | Towards detachment-compatible I-mode plasma on EAST tokamak |
| title_sort | towards detachment compatible i mode plasma on east tokamak |
| topic | I-mode divertor detachment neon seeding closed divertor EAST tokamak |
| url | https://doi.org/10.1088/1741-4326/addc80 |
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