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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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| TUPPH001 |
Positron Source Based on laser Compton Scattering Gamma Ray
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- S. Amano, S. Miyamoto, T. Mochizuki
NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
- K. Imasaki, D. Li
ILT, Suita, Osaka
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Positron generation from a laser Compton scattering gamma ray is presented. When the gamma ray bombards a target, the positron is generated due to the reaction of pair production, and it can be applied as the positon source of a collider. In our experiment, a 17 MeV gamma ray is produced in the way of laser Compton scattering and it induces positrons and electrons in a Pb target. The positron flux and energy spectrum were measured.
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