Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST
In the Experimental Advanced Superconducting Tokamak (EAST), a transition from electromagnetic to electrostatic turbulence is observed in the pedestal region as plasma density ramps up. This transition is manifested by the suppression of magnetic fluctuations and the presence of broadband electrosta...
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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/adf34b |
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| author | You Li Ning Yan Guosheng Xu Ziqiang Zhou Ganjun Zhang Shaocheng Liu Jilei Hou Qingquan Yang Kedong Li Wenxiang Shi Guangle Lin Lin Yu Yifeng Wang Xiang Jian Genfan Ding Ran Chen Yuqi Xu Rui Ding Jingsen Geng Wenxue Fu Qian Long Panjun Tang Yufei Zhang Ang Ti Haiqing Liu Liang Wang Qing Zang Jinping Qian the EAST Team |
| author_facet | You Li Ning Yan Guosheng Xu Ziqiang Zhou Ganjun Zhang Shaocheng Liu Jilei Hou Qingquan Yang Kedong Li Wenxiang Shi Guangle Lin Lin Yu Yifeng Wang Xiang Jian Genfan Ding Ran Chen Yuqi Xu Rui Ding Jingsen Geng Wenxue Fu Qian Long Panjun Tang Yufei Zhang Ang Ti Haiqing Liu Liang Wang Qing Zang Jinping Qian the EAST Team |
| author_sort | You Li |
| collection | DOAJ |
| description | In the Experimental Advanced Superconducting Tokamak (EAST), a transition from electromagnetic to electrostatic turbulence is observed in the pedestal region as plasma density ramps up. This transition is manifested by the suppression of magnetic fluctuations and the presence of broadband electrostatic turbulence. The frequency domain of the electrostatic turbulence is typically beyond 300 kHz. It leads to a rapid build-up of density gradient and a sharp degradation of energy confinement. By reducing the gas puffing rate, a prolonged intermediate transition phase is observed, and the confinement improved with increasing density in this phase. The emergence of broad electrostatic turbulence is associated with the enhanced turbulence control parameter α _t , together with a weaken edge radial electric field. Furthermore, the impact of the turbulence transition to scrape-off layer (SOL) transport is evaluated. Measurements suggested that radial particle flux and intermittent structures are strengthened after the transition. Moreover, the profiles in the far SOL are broaden with increase of α _t . The properties of the magnetic fluctuations are consistent with the nature of the magnetic coherent mode previously observed in EAST, while the broad electrostatic turbulence is proposed to be an ion temperature gradient mode by the Gyrokinetic Electromagnetic Numerical Experiment simulation. It is clarified that the energy confinement degradation in high-density regimes is primarily driven by the broadband turbulence rather than divertor detachment. These findings advance our understanding of high-density H-mode plasmas and provides additional insights into the interplay between edge turbulence and global confinement properties. |
| format | Article |
| id | doaj-art-6114022fe4e6455e87981449985151c2 |
| institution | DOAJ |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-6114022fe4e6455e87981449985151c22025-08-20T02:46:32ZengIOP PublishingNuclear Fusion0029-55152025-01-0165808604610.1088/1741-4326/adf34bStudy on the turbulence transition in the pedestal of high-density H-mode plasmas in EASTYou Li0Ning Yan1https://orcid.org/0000-0002-2536-5853Guosheng Xu2https://orcid.org/0000-0001-8495-8678Ziqiang Zhou3Ganjun Zhang4https://orcid.org/0000-0002-3500-5501Shaocheng Liu5https://orcid.org/0000-0002-7298-0680Jilei Hou6https://orcid.org/0000-0002-7109-5700Qingquan Yang7https://orcid.org/0000-0002-6354-1408Kedong Li8https://orcid.org/0000-0003-0486-7368Wenxiang Shi9https://orcid.org/0009-0005-7223-3748Guangle Lin10Lin Yu11Yifeng Wang12https://orcid.org/0000-0002-0368-9566Xiang Jian13https://orcid.org/0000-0003-3052-1694Genfan Ding14Ran Chen15Yuqi Xu16Rui Ding17https://orcid.org/0000-0003-2880-9736Jingsen Geng18https://orcid.org/0000-0002-0077-4052Wenxue Fu19Qian Long20Panjun Tang21Yufei Zhang22Ang Ti23Haiqing Liu24https://orcid.org/0000-0001-6892-358XLiang Wang25Qing Zang26Jinping Qian27https://orcid.org/0000-0002-2646-6509the EAST TeamHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; University of Science and Technology of China , Hefei 230026, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaIn the Experimental Advanced Superconducting Tokamak (EAST), a transition from electromagnetic to electrostatic turbulence is observed in the pedestal region as plasma density ramps up. This transition is manifested by the suppression of magnetic fluctuations and the presence of broadband electrostatic turbulence. The frequency domain of the electrostatic turbulence is typically beyond 300 kHz. It leads to a rapid build-up of density gradient and a sharp degradation of energy confinement. By reducing the gas puffing rate, a prolonged intermediate transition phase is observed, and the confinement improved with increasing density in this phase. The emergence of broad electrostatic turbulence is associated with the enhanced turbulence control parameter α _t , together with a weaken edge radial electric field. Furthermore, the impact of the turbulence transition to scrape-off layer (SOL) transport is evaluated. Measurements suggested that radial particle flux and intermittent structures are strengthened after the transition. Moreover, the profiles in the far SOL are broaden with increase of α _t . The properties of the magnetic fluctuations are consistent with the nature of the magnetic coherent mode previously observed in EAST, while the broad electrostatic turbulence is proposed to be an ion temperature gradient mode by the Gyrokinetic Electromagnetic Numerical Experiment simulation. It is clarified that the energy confinement degradation in high-density regimes is primarily driven by the broadband turbulence rather than divertor detachment. These findings advance our understanding of high-density H-mode plasmas and provides additional insights into the interplay between edge turbulence and global confinement properties.https://doi.org/10.1088/1741-4326/adf34bturbulence transitionH-modehigh-densityconfinementpedestalscrape-off layer parameters |
| spellingShingle | You Li Ning Yan Guosheng Xu Ziqiang Zhou Ganjun Zhang Shaocheng Liu Jilei Hou Qingquan Yang Kedong Li Wenxiang Shi Guangle Lin Lin Yu Yifeng Wang Xiang Jian Genfan Ding Ran Chen Yuqi Xu Rui Ding Jingsen Geng Wenxue Fu Qian Long Panjun Tang Yufei Zhang Ang Ti Haiqing Liu Liang Wang Qing Zang Jinping Qian the EAST Team Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST Nuclear Fusion turbulence transition H-mode high-density confinement pedestal scrape-off layer parameters |
| title | Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST |
| title_full | Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST |
| title_fullStr | Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST |
| title_full_unstemmed | Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST |
| title_short | Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST |
| title_sort | study on the turbulence transition in the pedestal of high density h mode plasmas in east |
| topic | turbulence transition H-mode high-density confinement pedestal scrape-off layer parameters |
| url | https://doi.org/10.1088/1741-4326/adf34b |
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