  Nonlinear simulation model for radio frequency (RF) waves in fusion plasmas
has been developed and verified using fully kinetic ion and drift kinetic
electron. Ion cyclotron motion in the toroidal geometry is implemented using
Boris push in the Boozer coordinates. Linear dispersion relation and nonlinear
particle trapping are verified for the lower hybrid (LH) wave and ion Bernstein
wave (IBW). Parametric decay instability is observed where a large amplitude
pump wave decays into an IBW sideband and an ion cyclotron quasimode (ICQM).
The ICQM induces an ion perpendicular heating with a heating rate proportional
to the pump wave intensity.
