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Hybrid simulation of fishbone instabilities in the EAST tokamak

Journal Article · · Nuclear Fusion
 [1];  [2];  [3];  [1];  [1];  [1]
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  2. Dalian Univ. of Technology (China). Key Lab. of Materials Modification by Laser, Ion and Electron Beams
  3. 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.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1378089
Alternate ID(s):
OSTI ID: 22925876
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 57; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIII-D tokamak journal December 2018
Dynamic evolution of resistive kink mode with electron diamagnetic drift in tokamaks journal April 2019
Summary of the 8th Asia-Pacific Transport Working Group (APTWG) Meeting journal January 2019
Modeling of the beam excited fishbone mode in EAST journal June 2019
Stability of Alfvén eigenmodes in the China Fusion Engineering Test Reactor journal October 2019

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