Abstract
Kinetic-MHD hybrid simulations are carried out to investigate possible fast-ion-driven modes on the Experimental Advanced Superconducting Tokamak. Three typical kinds of fast-ion-driven modes, namely, toroidicity-induced Alfvén eigenmodes, reversed shear Alfvén eigenmodes, and energetic-particle continuum modes, are observed simultaneously in the simulations. The simulation results are compared with the results of an ideal MHD eigenvalue code, which shows agreement with respect to the mode frequency, dominant poloidal mode numbers, and radial location. However, the modes in the hybrid simulations take a twisted structure on the poloidal plane, which is different from the results of the ideal MHD eigenvalue code. The twist is due to the radial phase variation of the eigenfunction, which may be attributed to the non-perturbative kinetic effects of the fast ions. By varying the stored energy of fast ions to change the fast ion drive in the simulations, it is demonstrated that the twist (i.e., the radial phase variation) is positively correlated with the fast ion drive.
Highlights
Alfvén eigenmodes (AEs) can be excited in tokamak plasmas by fast ions from various sources including neutral beam injection (NBI), RF heating, and fusion reactions[1,2,3,4,5,6,7,8]
The electromagnetic fluctuations of the AEs have the possibility of influencing the transport of fast ions and are important in determining the performance of NBI/RF heating and future burning plasmas[9,10,11,12,13,14,15,16,17]
With the NBI generated fast ions, various AEs will be routinely observed on Experimental Advanced Superconducting Tokamak (EAST)
Summary
Alfvén eigenmodes (AEs) can be excited in tokamak plasmas by fast ions from various sources including neutral beam injection (NBI), RF heating, and fusion reactions[1,2,3,4,5,6,7,8]. The simulation results are compared with the results of a MHD eigenvalue code[34], which shows agreement with respect to the frequency, dominant poloidal mode number, and radial location of the modes.
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