Nonlinear effects associated with the physics of radiofrequency wave propagation through a plasma are investigated numerically in the time domain, using both fluid and particle-in-cell (PIC) methods. We find favorable comparisons between parametric decay instability scenarios observed on the Alcator C-MOD experiment [J. C. Rost, M. Porkolab, and R. L. Boivin, Phys. Plasmas 9, 1262 (2002)] and PIC models. The capability of fluid models to capture important nonlinear effects characteristic of wave-plasma interaction (frequency doubling, cyclotron resonant absorption) is also demonstrated.
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Retaining an odd number (2p-1) of velocity moments also captures the p-th cyclotron resonance, provided the species gyroradius is small compared to the relevant wavelengths in the problem; if not, corrections to the resonance of order k⊥ρα ensue. The fluid simulations in this work satisfy this small-gyroradius constraint.
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