题名: Exciting and propagating characteristics of two coexisting kinetic geodesic acoustic modes in the edge of plasma
作者: Kong, D. F.4,5; Liu, A. D.5; Lan, T.5; Yu, C. X.5; Cheng, J.2; Qiu, Z. Y.3; Zhao, H. L.4,5; Shen, H. G.5; Yan, L. W.2; Dong, J. Q.2; Xu, M.2; Zhao, K. J.2; Duan, X. R.2; Liu, Y.2; Chen, R.4; Zhang, S. B.4; Sun, X.5; Xie, J. L.5; Li, H.5; Liu, W. D.5
刊名: NUCLEAR FUSION
出版日期: 2017-04-01
卷号: 57, 期号:4
关键词: Zonal flow ; Kinetic GAM ; Ambient turbulence
英文摘要: Coexisting dual kinetic geodesic acoustic modes (KGAMs) with similar characteristics have been observed with Langmuir probe arrays in the edge plasma of HL-2A tokamak with low density Ohmic discharge. The dual KGAMs are named a low-frequency GAM (LFGAM) and a high-frequency GAM (HFGAM), respectively. By changing the line averaged density from 1.0 x 10(19) m(-3) to 0.7 x 10(19) m(-3), the study of ne and Te profiles indicate that collision damping rate plays a crucial role on exciting of dual KGAMs, especially for the higher frequency branch (HFGAM). With the application of modulating techniques, we provide direct proof that nonlinear interactions between GAMs and ambient turbulence (AT) show great difference at different radial positions. At the exciting position of GAM, the amplitude modulation of AT is dominant, indicating that GAM is generated in the energy-conserving triad interaction. After the exciting of GAMs, they will propagate both inward and outward. During the propagation, the phase modulation of AT is dominant, GAMs can rarely gain energy from AT, yet they can give back-reactions on AT through shearing effect.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Physics, Fluids & Plasmas
研究领域[WOS]: Physics
关键词[WOS]: ZONAL FLOWS ; DIII-D ; TOKAMAK ; TURBULENCE
收录类别: SCI
语种: 英语
WOS记录号: WOS:000405943400002
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.hfcas.ac.cn:8080/handle/334002/33537]  
Appears in Collections:合肥物质科学研究院_中科院等离子体物理研究所


作者单位: 1.Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China
2.Southwestern Inst Phys, POB 432, Chengdu 610041, Sichuan, Peoples R China
3.Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Zhejiang, Peoples R China
4.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
5.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
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