Abstract
The linear parametric decay and oscillating two-stream instabilities have been studied at high-pump power for perturbations propagating oblique to the pump field. The electrostatic Vlasov–Poisson system for a homogeneous two-component plasma has been solved numerically to investigate the high-frequency branches of these instabilities. Results show that the maximum growth rate of the oscillating two-stream instability occurs oblique to the pump field for power levels above a critical value. The angular dependence of this growth rate is dependent on the electron-ion mass ratio. For these cases, the maximum value of the oscillating two-stream growth rate remains constant for increasing power above the critical level while the direction of maximum growth rate becomes more oblique to the pump field and the volume in k space of the unstable region increases. The maximum value of the parametric decay growth rate increases with increasing power level and occurs parallel to the pump field for all values of pump intensity investigated.
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