The intermittent excitation of geodesic acoustic mode by resonant Instanton of electron drift wave envelope in L-mode discharge near tokamak edge
文献类型：期刊论文
| 作者 | Liu, Zhao-Yang1,6; Zhang, Yang-Zhong5; Mitter Mahajan, Swadesh4; Liu, A-Di3; Zhou, Chu3; Xie, Tao2 |
| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 31 |
| 关键词 | zonal flow drift wave Instanton L-H mode |
| ISSN号 | 1674-1056 |
| DOI | 10.1088/1674-1056/ac43ac |
| 通讯作者 | Liu, Zhao-Yang(lzy0928@mail.ustc.edu.cn) |
| 英文摘要 | There are two distinct phases in the evolution of drift wave envelope in the presence of zonal flow. A long-lived standing wave phase, which we call the Caviton, and a short-lived traveling wave phase (in radial direction) we call the Instanton. Several abrupt phenomena observed in tokamaks, such as intermittent excitation of geodesic acoustic mode (GAM) shown in this paper, could be attributed to the sudden and fast radial motion of Instanton. The composite drift wave - zonal flow system evolves at the two well-separate scales: the micro-scale and the meso-scale. The eigenmode equation of the model defines the zero-order (micro-scale) variation; it is solved by making use of the two-dimensional (2D) weakly asymmetric ballooning theory (WABT), a theory suitable for modes localized to rational surface like drift waves, and then refined by shifted inverse power method, an iterative finite difference method. The next order is the equation of electron drift wave (EDW) envelope (containing group velocity of EDW) which is modulated by the zonal flow generated by Reynolds stress of EDW. This equation is coupled to the zonal flow equation, and numerically solved in spatiotemporal representation; the results are displayed in self-explanatory graphs. One observes a strong correlation between the Caviton-Instanton transition and the zero-crossing of radial group velocity of EDW. The calculation brings out the defining characteristics of the Instanton: it begins as a linear traveling wave right after the transition. Then, it evolves to a nonlinear stage with increasing frequency all the way to 20 kHz. The modulation to Reynolds stress in zonal flow equation brought in by the nonlinear Instanton will cause resonant excitation to GAM. The intermittency is shown due to the random phase mixing between multiple central rational surfaces in the reaction region. |
| WOS关键词 | ZONAL FLOWS ; EIGENMODES ; UNIVERSAL ; OSCILLATIONS ; INSTABILITY ; TRANSPORT |
| 资助项目 | National Natural Science Foundation of China[U1967206] ; National Natural Science Foundation of China[11975231] ; National Natural Science Foundation of China[11805203] ; National Natural Science Foundation of China[11775222] ; National MCF Energy Research and Development Program, China[2018YFE0311200] ; National MCF Energy Research and Development Program, China[2017YFE0301204] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences[QYZDB-SSW-SYS004] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000782501700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Natural Science Foundation of China ; National MCF Energy Research and Development Program, China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/128649]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Liu, Zhao-Yang |
| 作者单位 | 1.Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China 2.Sichuan Univ Sci & Engn, Sch Sci, Zigong 643000, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Peoples R China 4.Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA 5.Chinese Acad Sci, Ctr Magnet Fus Theory, Hefei 230026, Peoples R China 6.Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Zhao-Yang,Zhang, Yang-Zhong,Mitter Mahajan, Swadesh,et al. The intermittent excitation of geodesic acoustic mode by resonant Instanton of electron drift wave envelope in L-mode discharge near tokamak edge[J]. CHINESE PHYSICS B,2022,31. |
| APA | Liu, Zhao-Yang,Zhang, Yang-Zhong,Mitter Mahajan, Swadesh,Liu, A-Di,Zhou, Chu,&Xie, Tao.(2022).The intermittent excitation of geodesic acoustic mode by resonant Instanton of electron drift wave envelope in L-mode discharge near tokamak edge.CHINESE PHYSICS B,31. |
| MLA | Liu, Zhao-Yang,et al."The intermittent excitation of geodesic acoustic mode by resonant Instanton of electron drift wave envelope in L-mode discharge near tokamak edge".CHINESE PHYSICS B 31(2022). |
入库方式： OAI收割
来源：合肥物质科学研究院
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