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Microwave frequency downshift in the time-varying collision plasma

Microwave frequency downshift in the time-varying collision plasma has been demonstrated by particle-in-cell (PIC) simulation. The simulation results are basically consistent with the theoretical analysis, and the preconditions for microwave frequency downshift are that the collision frequency needs to be greater than the incident wave frequency, and the plasma frequency is twice greater than the incident wave frequency. Finally, the simulation results are compared with the reported experimental results indicating good agreement.