Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST
The decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for the first time in a high power injection ( P _inj > 10 MW), high performance ( β _N ∼ 2, β _P ∼ 2.8, n _e / n _GW ∼ 80%, f _BS ∼ 60%) H-mode discharge on experimental ad...
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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/adafc4 |
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| author | Zhen Zhou Shengyu Shi Ling Zhang Tao Zhang Xiaohe Wu Yunxin Cheng Wenmin Zhang Chaowei Mai Shengyu Fu Yifei Jin Xiang Jian Kaixuan Ye Lin Yu Ziqiang Zhou Jiuyang Ma Shuqi Yang Kangning Geng Gongshun Li Jia Huang Fei Wen Yunfeng Liang Xiang Gao |
| author_facet | Zhen Zhou Shengyu Shi Ling Zhang Tao Zhang Xiaohe Wu Yunxin Cheng Wenmin Zhang Chaowei Mai Shengyu Fu Yifei Jin Xiang Jian Kaixuan Ye Lin Yu Ziqiang Zhou Jiuyang Ma Shuqi Yang Kangning Geng Gongshun Li Jia Huang Fei Wen Yunfeng Liang Xiang Gao |
| author_sort | Zhen Zhou |
| collection | DOAJ |
| description | The decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for the first time in a high power injection ( P _inj > 10 MW), high performance ( β _N ∼ 2, β _P ∼ 2.8, n _e / n _GW ∼ 80%, f _BS ∼ 60%) H-mode discharge on experimental advanced superconducting tokamak. Unlike the previous phenomenon of electron cyclotron resonance heating core W control (Shi et al 2022 Nucl. Fusion 62 066031), there is a slight change in the background plasma temperature when higher ICRH is applied, but the toroidal rotational velocity decreases by ∼10 km s ^−1 . Under this condition, the intensity of W unresolved transition array spectral structure in the region of 45–70 Ǻ (which is composed of W ^27+ -W ^45+ line emissions) and W ^44+ density through spectroscopy in the Extreme Ultraviolet region decreases markedly. In addition, the poloidal asymmetry of radiation distribution from the tomographic inversions of Soft x-ray emission is reduced obviously. Theoretical modeling results indicate that the reduction in toroidal rotation leads to less W poloidal asymmetry and neoclassical pinch, which is more efficient in alleviating the core W accumulation than the improvement of isotropic hydrogen (H) minority temperature. The effects of isotropic and anisotropic H minority from ICRH on W transport are compared in the simulation lastly. |
| format | Article |
| id | doaj-art-a5c54a4a3c1149d19973fbbe1ff7892c |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-a5c54a4a3c1149d19973fbbe1ff7892c2025-02-10T09:00:36ZengIOP PublishingNuclear Fusion0029-55152025-01-0165303600410.1088/1741-4326/adafc4Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EASTZhen Zhou0https://orcid.org/0009-0000-8261-7837Shengyu Shi1Ling Zhang2Tao Zhang3https://orcid.org/0000-0002-1555-6226Xiaohe Wu4Yunxin Cheng5https://orcid.org/0000-0002-9195-2757Wenmin Zhang6https://orcid.org/0009-0000-9980-6765Chaowei Mai7https://orcid.org/0000-0001-9981-2620Shengyu Fu8Yifei Jin9https://orcid.org/0000-0002-3061-6709Xiang Jian10https://orcid.org/0000-0003-3052-1694Kaixuan Ye11https://orcid.org/0000-0003-0927-4502Lin Yu12https://orcid.org/0009-0004-1339-2389Ziqiang Zhou13Jiuyang Ma14Shuqi Yang15Kangning Geng16https://orcid.org/0000-0001-7808-0192Gongshun Li17https://orcid.org/0000-0002-5542-1238Jia Huang18https://orcid.org/0000-0001-6289-1812Fei Wen19Yunfeng Liang20Xiang Gao21https://orcid.org/0000-0003-1885-2538University of Science and Technology of China , Hefei 230026, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, China; Oak Ridge Associated Universities , Oak Ridge, TN 37831, United States of AmericaHefei 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, China; Hefei 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, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaGuangdong Ocean University , Zhanjiang 524088, ChinaUniversity of Science and Technology of China , Hefei 230026, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, China; Hefei 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, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, China; Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaUniversity of Science and Technology of China , Hefei 230026, China; Hefei 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, ChinaInstitute of Fusion Energy and Nuclear Waste Management - Plasmaphysik (IFN-1), Forschungszentrum Jülich GmbH , Jülich 52425, GermanyHefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei 230031, ChinaThe decrease in tungsten (W) content with the higher ion cyclotron resonance heating (ICRH) power is observed and explained for the first time in a high power injection ( P _inj > 10 MW), high performance ( β _N ∼ 2, β _P ∼ 2.8, n _e / n _GW ∼ 80%, f _BS ∼ 60%) H-mode discharge on experimental advanced superconducting tokamak. Unlike the previous phenomenon of electron cyclotron resonance heating core W control (Shi et al 2022 Nucl. Fusion 62 066031), there is a slight change in the background plasma temperature when higher ICRH is applied, but the toroidal rotational velocity decreases by ∼10 km s ^−1 . Under this condition, the intensity of W unresolved transition array spectral structure in the region of 45–70 Ǻ (which is composed of W ^27+ -W ^45+ line emissions) and W ^44+ density through spectroscopy in the Extreme Ultraviolet region decreases markedly. In addition, the poloidal asymmetry of radiation distribution from the tomographic inversions of Soft x-ray emission is reduced obviously. Theoretical modeling results indicate that the reduction in toroidal rotation leads to less W poloidal asymmetry and neoclassical pinch, which is more efficient in alleviating the core W accumulation than the improvement of isotropic hydrogen (H) minority temperature. The effects of isotropic and anisotropic H minority from ICRH on W transport are compared in the simulation lastly.https://doi.org/10.1088/1741-4326/adafc4ICRHW reductionEASTW neoclassical transportH minorityisotropic and anisotropic effects |
| spellingShingle | Zhen Zhou Shengyu Shi Ling Zhang Tao Zhang Xiaohe Wu Yunxin Cheng Wenmin Zhang Chaowei Mai Shengyu Fu Yifei Jin Xiang Jian Kaixuan Ye Lin Yu Ziqiang Zhou Jiuyang Ma Shuqi Yang Kangning Geng Gongshun Li Jia Huang Fei Wen Yunfeng Liang Xiang Gao Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST Nuclear Fusion ICRH W reduction EAST W neoclassical transport H minority isotropic and anisotropic effects |
| title | Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST |
| title_full | Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST |
| title_fullStr | Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST |
| title_full_unstemmed | Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST |
| title_short | Tungsten impurity reduction by ICRH in a high power injection and high performance H-mode discharge on EAST |
| title_sort | tungsten impurity reduction by icrh in a high power injection and high performance h mode discharge on east |
| topic | ICRH W reduction EAST W neoclassical transport H minority isotropic and anisotropic effects |
| url | https://doi.org/10.1088/1741-4326/adafc4 |
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