Observation of nonlinear couplings between coexisting kinetic geodesic acoustic modes in the edge plasmas of the HT-7 tokamak
Observation of nonlinear couplings between coexisting kinetic geodesic acoustic modes in the edge plasmas of the HT-7 tokamak
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HT-7 托卡马克边缘等离子体中共存动力学测地声学模式之间非线性耦合的观测
DOI：
10.1088/0029-5515/53/11/113008
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发表时间：
2013-11
期刊：
影响因子：
3.3
通讯作者：
Liu, W. D.
中科院分区：
文献类型：
--
作者：
Sun, X.;Xie, J. L.;Li, H.;Liu, W. D.
在具有锂涂层壁的HT - 7托卡马克边缘等离子体中，通过朗缪尔探针阵列观察和研究了共存的多测地声模（GAMs），特别是共存的双测地声模。双测地声模被命名为低频测地声模（LFGAM）
Coexisting multi-geodesic acoustic modes (GAMs), especially coexisting dual GAMs, are observed and studied through Langmuir probe arrays at the edge plasmas of the HT-7 tokamak with lithium-coated walls. The dual GAMs are named a low-frequency GAM (LFGAM) and a high-frequency GAM (HFGAM), and it is found that within the measuring range, the HFGAM propagates outwards while the LFGAM propagates both inwards and outwards with their central frequencies nearly unchanged, and both modes have maximum amplitudes at positions with radial wavenumbers close to zero; meanwhile, the two positions happen to be where the continuum GAM frequency is closest to the central frequencies of the LFGAM and the HFGAM. These characteristics are consistent with those of a kinetic GAM converted from a continuum GAM. The nonlinear couplings between the LFGAM and the HFGAM are also analysed. In this study, we observed not only the interaction between the LFGAM and the HFGAM, but also the self-coupling of the GAM with the beat frequency between them, as well as the coupling between the LFGAM and an unknown mode at ∼50 kHz. These nonlinear interactions may play important roles during the saturation process of GAMs. Additionally, amplitude correlation analyses of multi-GAMs indicate that second harmonic GAMs are probably generated from the self-interaction of fundamental GAMs.
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影响因子：
2.2
作者：
Z. Qiu;Liu Chen;F. Zonca
通讯作者：
Z. Qiu;Liu Chen;F. Zonca
影响因子：
2.2
作者：
A. Liu;T. Lan;C X Yu;W. Zhang;H. Zhao;D. Kong;J. Chang;B. Wan
通讯作者：
A. Liu;T. Lan;C X Yu;W. Zhang;H. Zhao;D. Kong;J. Chang;B. Wan
HL-2A托卡马克测地线声模的频谱特性
影响因子：
2.2
作者：
通讯作者：
--
影响因子：
8.6
作者：
X. Xu;Z. Xiong;Zhe Gao;Nevins Wm;McKee Gr
通讯作者：
X. Xu;Z. Xiong;Zhe Gao;Nevins Wm;McKee Gr
影响因子：
2.2
作者：
T. Watari;Y. Hamada;A. Fujisawa;K. Toi;K. Itoh
通讯作者：
T. Watari;Y. Hamada;A. Fujisawa;K. Toi;K. Itoh