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| MOPPH018 |
Particle-in-cell Simulation of Two-stream Smith-Purcell Free-electron Laser
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- K. Imasaki, D. Li
ILT, Suita, Osaka
- Z. Liang, Z. Yang, W. Liu
UESTC, Chengdu, Sichuan
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An approach to enhancement of terahertz (THz) Smith-Purcell (SP) radiation from an open rectangular grating driven by two electron beams is presented in this paper. The two electron beams with a velocity separation propagate over the grating. With the help of a two-dimensional particle-in-cell (PIC) simulation, some nonlinear processes from spontaneous emission to superradiant radiation are demonstrated. The optimum voltage ratio is obtained where the SP radiation power achieves the maximum. The simulation results show that the enhancements of radiation power, the shortened saturation time, and the decrease of critical current for spontaneous SPR to superradiant at a proper voltage ratio. The simulation results can correspond to the linear analyses.
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