Hybrid simulation of fishbone instabilities in the EAST tokamak

Shen, Wei; Wang, Feng; Fu, G. Y.; Xu, Liqing; Li, Guoqiang; Liu, Chengyue

doi:10.1088/1741-4326/aa7f9c

Title: Hybrid simulation of fishbone instabilities in the EAST tokamak

Journal Article · Fri Aug 11 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa7f9c· OSTI ID:1378089

Shen, Wei ^[1]; Wang, Feng ^[2];

^[3]; Xu, Liqing ^[1];

^[1]; Liu, Chengyue ^[1]

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)

Hybrid simulations with the global kinetic-magnetohydrodynamic (MHD) code M3D-K have been carried out to investigate the linear stability and nonlinear dynamics of beam-driven 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 beta-induced 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 hole-clump structures in phase space, consistent with the Berk-Breizman 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.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: YZJJ201510; 11505022; 11605245; AC02-09CH11466

OSTI ID:: 1378089

Journal Information:: Nuclear Fusion, Vol. 57, Issue 11; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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beam-driven instabilities
clump pair creation
internal kink mode
diii-d tokamak
plasma
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reconstruction

Title: Hybrid simulation of fishbone instabilities in the EAST tokamak

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