Fishbone Mode Excited by Deeply Trapped Energetic Beam Ions in EAST

ZHENG Ting (郑婷); WU Bin (吴斌); XU Liqing (徐立清); HU Chundong (胡纯栋); ZANG Qing (臧庆); DING Siye (丁斯晔); LI Yingying (李颖颖); WU Xingquan (伍兴权); WANG Jinfang (王进芳); SHEN Biao (沈飙); ZHONG Guoqiang (钟国强); LI Hao (李昊); SHI Tonghui (石同辉); EAST Team

doi:10.1088/1009-0630/18/6/03

Plasma Science and Technology > 2016 > 18(6): 595-600. > DOI: 10.1088/1009-0630/18/6/03

ZHENG Ting (郑婷), WU Bin (吴斌), XU Liqing (徐立清), HU Chundong (胡纯栋), ZANG Qing (臧庆), DING Siye (丁斯晔), LI Yingying (李颖颖), WU Xingquan (伍兴权), WANG Jinfang (王进芳), SHEN Biao (沈飙), ZHONG Guoqiang (钟国强), LI Hao (李昊), SHI Tonghui (石同辉), EAST Team. Fishbone Mode Excited by Deeply Trapped Energetic Beam Ions in EAST[J]. Plasma Science and Technology, 2016, 18(6): 595-600. DOI: 10.1088/1009-0630/18/6/03

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Fishbone Mode Excited by Deeply Trapped Energetic Beam Ions in EAST

1School of Physics and Materials Science, Anhui University, Hefei 230039, China 2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2013GB101001, 2014DFG61950 and 2013GB112003 ) and National Natural Science Foundation of China (Nos. 11175211 and 11275233)

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Received Date: July 10, 2015

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Abstract

Abstract

This paper describes the fishbone mode phenomena during the injection of high-power neutral beams in EAST (Experimental Advanced Superconducting Tokamak). The features of the fishbone mode are presented. The change in frequency of the mode during a fishbone burst is from 1 kHz to 6 kHz. The nonlinear behavior of the fishbone mode is analyzed by using a prey-predator model, which is consistent with the experimental results. This model indicates that the periodic oscillations of the fishbone mode always occur near the critical value of fast ion beta. Furthermore, the neutral beam analysis for the discharge is done by using the NUBEAM module of the TRANSP code. According to the numerical simulation results and theoretical calculation, it can be concluded that the fishbone mode is driven by the deeply trapped energetic beam ions in EAST.
- EAST,
- NBI, fishbone mode,
- TRANSP code,
- nonlinear behavior

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References

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