Hybrid simulation of fishbone instabilities in the EAST tokamak
Hybrid simulations with the global kineticmagnetohydrodynamic (MHD) code M3DK have been carried out to investigate the linear stability and nonlinear dynamics of beamdriven fishbone in the experimental advanced superconducting tokamak (EAST) experiment. Linear simulations show that a low frequency fishbone instability is excited at experimental value of beam ion pressure. The mode is mainly driven by low energy beam ions via precessional resonance. Our results are consistent with the experimental measurement with respect to mode frequency and mode structure. When the beam ion pressure is increased to exceed a critical value, the low frequency mode transits to a betainduced Alfven eigenmode (BAE) with much higher frequency. This BAE is driven by higher energy beam ions. Nonlinear simulations show that the frequency of the low frequency fishbone chirps up and down with corresponding holeclump structures in phase space, consistent with the BerkBreizman theory. In addition to the low frequency mode, the high frequency BAE is excited during the nonlinear evolution. Furthermore, for the transient case of beam pressure fraction where the low and high frequency modes are simultaneously excited in the linear phase, only one dominant mode appears in the nonlinear phase with frequency jumps up and down during nonlinear evolution.
 Authors:

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 Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
 Dalian Univ. of Technology (China). Key Lab. of Materials Modification by Laser, Ion and Electron Beams
 Zhejiang Univ., Hangzhou (China). Inst. for Fusion Theory and Simulation; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Publication Date:
 Grant/Contract Number:
 YZJJ201510; 11505022; 11605245; AC0209CH11466
 Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Fusion
 Additional Journal Information:
 Journal Volume: 57; Journal Issue: 11; Journal ID: ISSN 00295515
 Publisher:
 IOP Science
 Research Org:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC24)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fishbone instability; EAST; frequency chirping; holeclump formation; waveparticle resonance; beamdriven instabilities; clump pair creation; internal kink mode; diiid tokamak; plasma; ions; reconstruction
 OSTI Identifier:
 1378089
Shen, Wei, Wang, Feng, Fu, G. Y., Xu, Liqing, Li, Guoqiang, and Liu, Chengyue. Hybrid simulation of fishbone instabilities in the EAST tokamak. United States: N. p.,
Web. doi:10.1088/17414326/aa7f9c.
Shen, Wei, Wang, Feng, Fu, G. Y., Xu, Liqing, Li, Guoqiang, & Liu, Chengyue. Hybrid simulation of fishbone instabilities in the EAST tokamak. United States. doi:10.1088/17414326/aa7f9c.
Shen, Wei, Wang, Feng, Fu, G. Y., Xu, Liqing, Li, Guoqiang, and Liu, Chengyue. 2017.
"Hybrid simulation of fishbone instabilities in the EAST tokamak". United States.
doi:10.1088/17414326/aa7f9c. https://www.osti.gov/servlets/purl/1378089.
@article{osti_1378089,
title = {Hybrid simulation of fishbone instabilities in the EAST tokamak},
author = {Shen, Wei and Wang, Feng and Fu, G. Y. and Xu, Liqing and Li, Guoqiang and Liu, Chengyue},
abstractNote = {Hybrid simulations with the global kineticmagnetohydrodynamic (MHD) code M3DK have been carried out to investigate the linear stability and nonlinear dynamics of beamdriven fishbone in the experimental advanced superconducting tokamak (EAST) experiment. Linear simulations show that a low frequency fishbone instability is excited at experimental value of beam ion pressure. The mode is mainly driven by low energy beam ions via precessional resonance. Our results are consistent with the experimental measurement with respect to mode frequency and mode structure. When the beam ion pressure is increased to exceed a critical value, the low frequency mode transits to a betainduced Alfven eigenmode (BAE) with much higher frequency. This BAE is driven by higher energy beam ions. Nonlinear simulations show that the frequency of the low frequency fishbone chirps up and down with corresponding holeclump structures in phase space, consistent with the BerkBreizman theory. In addition to the low frequency mode, the high frequency BAE is excited during the nonlinear evolution. Furthermore, for the transient case of beam pressure fraction where the low and high frequency modes are simultaneously excited in the linear phase, only one dominant mode appears in the nonlinear phase with frequency jumps up and down during nonlinear evolution.},
doi = {10.1088/17414326/aa7f9c},
journal = {Nuclear Fusion},
number = 11,
volume = 57,
place = {United States},
year = {2017},
month = {8}
}