The phase-space structure of ion diffusion tensor in ITG turbulence is studied by using the newly developed numerical code NDTM. The numerical results show that at both the linear and nonlinear stage, the diffusion tensor of ITG turbulence presents typical ballooning structure in poloidal direction and magnetic drift resonance structure in velocity-space. The Drr and DrK components of the diffusion tensor satisfy the Stokes-Einstein relation. It is found that the phase-space structure of ion diffusion tensor at linear stage is induced by the resonance between ions and ITG eigenmodes, while that at nonlinear stage is induced by the resonance between ions and the Daughter-Ballooning-Modes under the poloidal acceleration of nonlinear zonal radial electric fields.
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