Observation of Multiple Broadband Alfvénic Chirping Modes in HL-2A NBI Plasmas

Multiple broadband Alfvénic chirping modes (CMs), with frequencies in the wide range of f ∼ 35–150 kHz and chirping down rapidly, are found in HL-2A neutral beam injection plasmas, and the CMs can even coexist. The frequency chirping down process can be completed within ∼1 ms, and the frequency shif...

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Bibliographic Details
Published in:Chinese physics letters 2021-06, Vol.38 (5), p.55202-45
Main Authors: Yu, Liming, Chen, Wei, Ji, Xiaoquan, Shi, Peiwan, Ding, Xuantong, Shi, Zhongbing, Ma, Ruirui, Hou, Yumei, Li, Yonggao, Li, Jiaxian, Cao, Jianyong, Zhong, Wulyu, Xu, Min, Duan, Xuru
Format: Article
Language:English
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Summary:Multiple broadband Alfvénic chirping modes (CMs), with frequencies in the wide range of f ∼ 35–150 kHz and chirping down rapidly, are found in HL-2A neutral beam injection plasmas, and the CMs can even coexist. The frequency chirping down process can be completed within ∼1 ms, and the frequency shift can reach 30–50 kHz. The CMs propagate in ion diamagnetic drift directions poloidally. The toroidal mode number is confirmed to be n = 1, 2, 3 and 4 for the f ∼ 35–65, 55–90, 70–120 and 100–150 kHz CMs, respectively. The CMs are more like to be energetic-particle continuum modes (EPMs), since the modes almost locate on the Alfvén continuum.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/38/5/055202