| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Nonlinear Energy Cascading in Turbulence during the Internal Reconnection Event at the Sino-United Spherical Tokamak |
| Song Chai1**, Yu-Hong Xu2, Zhe Gao1, Wen-Hao Wang1, Yang-Qing Liu1, Yi Tan1 |
1Department of Engineering Physics, Tsinghua University, Beijing 100084
2Southwestern Institute of Physics, Chengdu 610041
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| Cite this article: |
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Song Chai, Yu-Hong Xu, Zhe Gao et al 2017 Chin. Phys. Lett. 34 025201 |
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Abstract The characteristics of the energy transfer and nonlinear coupling among edge electromagnetic turbulence in thermal quench sub-period of the internal reconnection event (IRE) are studied at the sino-united spherical tokamak device using multiple Langmuir and magnetic probe arrays. The wavelet bispectral analysis and the modified Kim method are applied to investigate linear growth/damping and nonlinear energy transfer rates, along with multi-field turbulence interactions. The results show a multi-field nonlinear energy transfer from electrostatic to magnetic turbulence that results in two-mode coupling in magnetic turbulence, which may play a crucial role to trigger the IRE.
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Received: 01 November 2016
Published: 25 January 2017
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| PACS: |
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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52.35.Ra
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(Plasma turbulence)
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52.35.Vd
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(Magnetic reconnection)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11261140327, 11325524, 11475102 and 11575057, the Chinese National Fusion Project for ITER under Grant Nos 2013GB112001, 2013GB107001 and 2014GB108000, the Tsinghua University Initiative Scientific Research Program, and the 221 Program. |
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