  Electromagnetic cascades attract a lot of attention as an important QED
effect that will reveal itself in various electromagnetic field configurations
at ultrahigh intensities. We study cascade dynamics in rotating electric field
analytically and numerically. The kinetic equations for the electron-positron
plasma and gamma-quanta are formulated. The scaling laws are derived and
analyzed. For the cascades arising far above the threshold the dependence of
the cascade parameters on the field frequency is derived. The spectra of
high-energy cascade particles are calculated. The analytical results are
verified by numerical simulations.
