  Nonlinear saturation of toroidal Alfven eigenmode (TAE) via ion induced
scatterings is investigated in the short-wavelength gyrokinetic regime. It is
found that the nonlinear evolution depends on the thermal ion \b{eta} value.
Here, \b{eta} is the plasma thermal to magnetic pressure ratio. Both the
saturation levels and associated energetic-particle transport coefficients are
derived and estimated correspondingly.
