Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak
文献类型：期刊论文
| 作者 | Zhong, X. M.4; Zou, X. L.3; Liu, A. D.4; Song, Y. T.2; Zhuang, G.4; Li, E. Z.2; Zhang, B.2 ; Zhang, J.4; Zhou, C.4; Feng, X.1
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| 刊名 | NUCLEAR FUSION
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| 出版日期 | 2022-06-01 |
| 卷号 | 62 |
| 关键词 | I-mode I-H transition pedestal burst instabilities density gradient |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ac60e9 |
| 通讯作者 | Liu, A. D.() ; Song, Y. T.(songyt@ipp.ac.cn) |
| 英文摘要 | Quasi-periodic pedestal burst instabilities (PBIs), featuring alternative turbulence suppression and bursts, have been clearly identified by various edge diagnostics during I-mode to H-mode transition in the EAST Tokamak. The radial distribution of the phase perturbation caused by PBI shows that PBI is localized in the pedestal. Prior to each PBI, a significant increase of density gradient close to the pedestal top can be clearly distinguished, then the turbulence burst is generated, accompanied by the relaxation of the density profile, and then induces an outward particle flux. The relative density perturbation caused by PBIs is about 6%-8%. Statistic analyses show that the pedestal normalized density gradient R/L (n) triggering the first PBI has a threshold value, mostly in the range of 22-24, suggesting that a PBI triggering instability could be driven by the density gradient. And R/L (n) triggering the last PBI is about 30-40 and seems to increase with the loss power and the chord-averaged density. In addition, the frequency of PBI is likely to be inversely proportional to the chord-averaged density and the loss power. These results suggest that PBIs and the density gradient prompt increase prior to PBIs can be considered as the precursor for controlling I-H transition. |
| WOS关键词 | EDGE-LOCALIZED MODES ; CONFINEMENT MODE ; REGIME ; SCATTERING ; BARRIER |
| 资助项目 | Natural Science Foundation of China[U1967206] ; Natural Science Foundation of China[11975231] ; Natural Science Foundation of China[11922513] ; National MCF Energy RD Program[2017YFE0301204] ; National MCF Energy RD Program[2018YFE0311200] ; Users with Excellence Program of Hefei Science Center CAS[2020HSC-UE009] ; FundamentalResearch Funds for the Central Universities |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000783683200001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Natural Science Foundation of China ; National MCF Energy RD Program ; Users with Excellence Program of Hefei Science Center CAS ; FundamentalResearch Funds for the Central Universities |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/128513]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Liu, A. D.; Song, Y. T. |
| 作者单位 | 1.Shenzhen Univ, Shenzhen 518061, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230021, Anhui, Peoples R China 3.CEA, IRFM, F-13108 St Paul Les Durance, France 4.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhong, X. M.,Zou, X. L.,Liu, A. D.,et al. Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak[J]. NUCLEAR FUSION,2022,62. |
| APA | Zhong, X. M..,Zou, X. L..,Liu, A. D..,Song, Y. T..,Zhuang, G..,...&Zhang, X. J..(2022).Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak.NUCLEAR FUSION,62. |
| MLA | Zhong, X. M.,et al."Characterization of pedestal burst instabilities during I-mode to H-mode transition in the EAST tokamak".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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