| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Observation of Multiple Broadband Alfvénic Chirping Modes in HL-2A NBI Plasmas |
| Liming Yu1, Wei Chen1*, Xiaoquan Ji1, Peiwan Shi2, Xuantong Ding1, Zhongbing Shi1, Ruirui Ma1, Yumei Hou1, Yonggao Li1, Jiaxian Li1, Jianyong Cao1, Wulyu Zhong1, Min Xu1, and Xuru Duan1 |
1Southwestern Institute of Physics, Chengdu 610041, China
2Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
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| Cite this article: |
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Liming Yu, Wei Chen, Xiaoquan Ji et al 2021 Chin. Phys. Lett. 38 055202 |
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Abstract Multiple broadband Alfvénic chirping modes (CMs), with frequencies in the wide range of $f\sim35$–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 $\sim$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 $f\sim35$–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.
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Received: 14 January 2021
Published: 02 May 2021
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| PACS: |
52.35.Bj
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(Magnetohydrodynamic waves (e.g., Alfven waves))
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52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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52.50.Gj
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(Plasma heating by particle beams)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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| Fund: Supported by the National Key R$\&$D Program of China (Grant Nos. 2018YFE0304102, 2019YFE03020000 and 2017YFE0301202), the National Natural Science Foundation of China (Grant Nos. 11875024, 11875021, 11835010 and 12005054), the Sichuan Provincial Science and Technology Project (Grant Nos. 2020YFSY0047 and 2020JDJQ0070). |
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