Characteristics of grassy ELMs and their impact on the divertor heat flux width
文献类型：期刊论文
| 作者 | Li, Nami2,3; Xu, X. Q.3; Wang, Y. F.1; Yan, N.1 ; Zhang, J. Y.1; Qian, J. P.1; Sun, J. Z.2; Wang, D. Z.2
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| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2022-09-01 |
| 卷号 | 62 |
| ISSN号 | 0029-5515 |
| 关键词 | grassy ELM BOUT plus plus turbulence heat flux width |
| DOI | 10.1088/1741-4326/ac83d9 |
| 通讯作者 | Li, Nami(li55@llnl.gov) |
| 英文摘要 | BOUT++ turbulence simulations are conducted for a 60 s steady-state long pulse high beta (p) EAST grassy ELM discharge. BOUT++ linear simulations show that the unstable mode spectrum covers a range of toroidal mode numbers from low-n (n = 10-15) peeling-ballooning modes (P-B) to high-n (n = 40-80) drift-Alfven instabilities. Nonlinear simulations show that the ELM crash is triggered by low-n peeling modes and fluctuation is generated at the peak pressure gradient position and radially spread outward into the scrape-off-layer, even though the drift-Alfven instabilities dominate the linear growth phase. However, drift-Alfven turbulence delays the onset of the grassy ELM and enhances the energy loss with the fluctuation extending to pedestal top region. Simulations further show that if the peeling drive is removed, the fluctuation amplitude drops by an order of magnitude and the ELM crashes disappear. The divertor heat flux width is similar to 2 times larger than the estimates based on the HD model and the Eich's ITPA multi-tokamak scaling (or empirical Eich scaling) due to the strong radial turbulence transport. |
| 资助项目 | National Key R&D Program of China[2017YFE0301206] ; National Key R&D Program of China[2017YFE0300402] ; National Key R&D Program of China[2017YFE0301100] ; Users with Excellence Program of Hefei Science Center, CAS[2021HSC-UE014] ; National Natural Science Foundation of China[11675037] ; US Department of Energy by Lawrence Livermore National Laboratory[DE-AC52-07NA27344] ; US Department of Energy by Lawrence Livermore National Laboratory[LLNL-JRNL-833914] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP Publishing Ltd |
| WOS记录号 | WOS:000840498400001 |
| 资助机构 | National Key R&D Program of China ; Users with Excellence Program of Hefei Science Center, CAS ; National Natural Science Foundation of China ; US Department of Energy by Lawrence Livermore National Laboratory |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/132079]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Li, Nami |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China 3.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA |
| 推荐引用方式 GB/T 7714 | Li, Nami,Xu, X. Q.,Wang, Y. F.,et al. Characteristics of grassy ELMs and their impact on the divertor heat flux width[J]. NUCLEAR FUSION,2022,62. |
| APA | Li, Nami.,Xu, X. Q..,Wang, Y. F..,Yan, N..,Zhang, J. Y..,...&Wang, D. Z..(2022).Characteristics of grassy ELMs and their impact on the divertor heat flux width.NUCLEAR FUSION,62. |
| MLA | Li, Nami,et al."Characteristics of grassy ELMs and their impact on the divertor heat flux width".NUCLEAR FUSION 62(2022). |
入库方式： OAI收割
来源：合肥物质科学研究院
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