Abstract
Terahertz (THz) electromagnetic (EM) radiation in beam-plasma system under different plasma distribution has been simulated using particle-in-cell (PIC) method in this paper. The calculation results show that the electromagnetic radiation frequency under radially non-uniform plasma distribution is lower than that under uniform plasma distribution, which is good agreement with the theoretical analysis. The related physical analysis about the simulation results is given out. This work will give a better physical understanding of beam-plasma system and provide guidance to the project practice
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