Simulation of parametric decay instability excited by oscillating pump near lower hybrid frequency

Parametric decay instability of lower hybrid waves plays an important role in plasma heating. Simulation such requires inclusion both electron and ion kinetics with a realistic mass ratio. In this work, the gyrokinetic fully kinetic (GeFi) particle simulation model is used to study parametric instabilities uniform, magnetized plasmas. A pump electric field near frequency imposed, which treated dipole approximation. Three types processes are obtained, including purely growing modulational instability, resonant non-resonant instability. Dependences growth rates on wavenumber, strength, systematically investigated. The results agree well those linear stage obtained existing theory. Whether or nonlinearity dominates process assessed, importance E×B drift three-wave interaction confirmed.