Abstract
The reserved shear Alfven eigenmodes (RSAEs) whose frequencies sweep down have been observed in HL-2A plasmas at qmin ∼ 1 during current ramp-up and NBI+ECRH recently. The kinetic Alfven eigenmode code (KAEC), which is a non-perturbative kinetic/magnetohydrodynamic eigenvalue code for calculating kinetic damping of shear Alfven eigenmodes, is used to investigate the modes according to the experimental data. It is found that the kinetic reversed shear Alfven eigenmodes (KRSAEs) with downsweeping frequency and localized radial structure would appear, which are consistent with the observations. The theoretical analysis for the existence of the mode and the scaling of the mode width are provided. It is shown that the mode width of KRSAEs is proportional to the square root of thermal ion Larmor radius.
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