Dependence of ELM instability on separatrix density in EAST long-pulse H-mode plasmas
文献类型：期刊论文
| 作者 | Wang, Y. F.4; Jia, G. Z.4; Xu, G. S.4 ; Chen, R.4; Chen, L.4; Yan, N.4; Wang, L.4; Zang, Q.4; Zhang, T.4; Duan, Y. M.4
|
| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 64 |
| 关键词 | edge-localized modes (ELMs) separatrix density long-pulse H-mode EAST tokamak |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad7866 |
| 通讯作者 | Xu, G. S.(gsxu@ipp.ac.cn) ; Chen, R.(chenran@ipp.ac.cn) |
| 英文摘要 | The transition from small edge-localized modes (ELMs) to large ELMs has been repetitively observed in minute-scale long-pulse high-confinement mode (H-mode) discharges during the 2017 EAST campaign. The appearance of large ELMs is found to be strongly correlated with the decrease in separatrix density due to the gradual decrease in fuel recycling during long-pulse H-mode operations (LPHOs). By the numerical scanning of separatrix density with a fixed temperature profile, it has been found that the dependence of ELM instability on separatrix density is related to the competition between the ion diamagnetic stabilizing effect and destabilizing effect of pressure gradient and current density in the pedestal region. This sheds light on a comprehensive understanding of the different roles of separatrix density in ELM instability observed during EAST experiments. With a high separatrix density, the ideal ballooning mode can be destabilized near the separatrix, which is thought to help achieve small ELMs in EAST LPHOs. During the 2021 EAST campaign, an experiment of large ELM control was performed through actively changing fuel recycling by moving the strike point location on the lower tungsten divertor target plate. It has been demonstrated that the mitigation of large ELMs is strongly correlated with the significant increase in separatrix density, which is thought to be attributed to a higher ionization source in the scrape-off layer (SOL) region by SOLPS-ITER simulation. The high ionization source in the SOL region is believed to provide a strong fueling effect near the separatrix and thus raise the local density, which is considered an important reason for triggering ballooning instabilities near the separatrix and achieving small ELMs. |
| WOS关键词 | EQUILIBRIUM RECONSTRUCTION ; CONFINEMENT ; REFLECTOMETRY ; PEDESTAL ; PROFILE |
| 资助项目 | National MCF Energy R&D Program of China[2022YFE03020004] ; National MCF Energy R&D Program of China[2019YFE03030000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB0790101] ; National Natural Science Foundation of China[12005263] ; National Natural Science Foundation of China[12205335] ; National Natural Science Foundation of China[U19A20113] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001324018400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National MCF Energy R&D Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/135649]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Xu, G. S.; Chen, R. |
| 作者单位 | 1.Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Gen Atom, POB 85608, San Diego, CA 92186 USA 4.Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, POB 1126, Hefei 230031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Y. F.,Jia, G. Z.,Xu, G. S.,et al. Dependence of ELM instability on separatrix density in EAST long-pulse H-mode plasmas[J]. NUCLEAR FUSION,2024,64. |
| APA | Wang, Y. F..,Jia, G. Z..,Xu, G. S..,Chen, R..,Chen, L..,...&Gong, X. Z..(2024).Dependence of ELM instability on separatrix density in EAST long-pulse H-mode plasmas.NUCLEAR FUSION,64. |
| MLA | Wang, Y. F.,et al."Dependence of ELM instability on separatrix density in EAST long-pulse H-mode plasmas".NUCLEAR FUSION 64(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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