Fig. 1. Radial distribution of ITB temperature and density after flatten processing

Fig. 2. Grid distribution of HL-2M equilibrium

Fig. 3. Time evolution of ion heat diffusivity with and without zonal flow simulation

Fig. 4. Two-dimensional poloidal plane nonlinear mode structure (a) t = 14.0 R₀/c_s, (b) t = 22.0 R₀/c_s

Fig. 5. Poloidal spectra measured at three moments

Fig. 6. Time evolution of ion heat diffusivity measured at three diagnostic points

Fig. 7. Radial distribution of heat diffusivities of electrons and ions during the turbulent saturation period (t=20.0 R₀/c_s)

Fig. 8. Dispersion of instability at the diagnosis point (r=0.64 a)(a) The variation of instability growth rate with polar wave vector, (b) The variation of unstable frequency with polar wave vector