| Paper |
Title |
Page |
| MOPPH033 |
Two-Stream Smith-Purcell Free-Electron Laser Using a Dual-Grating: Linear Analysis
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111 |
| |
- D. Li, K. Imasaki
ILT, Suita, Osaka
- Z. Liang, W. Liu, Z. Yang
UESTC, Chengdu, Sichuan
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We present a linear analysis of two-stream Smith-Purcell Free-Electron Laser (SP-FEL). In this system, two electron-beams with velocity separation pass a rectangular dual-grating. The dispersion relation is derived employing the linear fluid theory and the growth rate is investigated through the numerical solutions. The instability of two-stream is obtained at an optimize separation velocity, and the effects of separation velocity , distance between the dual-grating, groove-depth, groove-width, beams energy on growth rate and bandwidth are studied in detail.
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| TUPPH048 |
Superradiant Smith-Purcell Radiation in the Terahertz-wave Region from Bunched Electron Beams
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435 |
| |
- Z. Shi, Z. Liang, Z. Yang
UESTC, Chengdu, Sichuan
- K. Imasaki, D. Li
ILT, Suita, Osaka
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This paper presents a study of the characteristic of Smith-Purcell radiation (SPR) in the terahertz-wave (THz) region from bunched electron beams. The model consists of a grating with different period length and grating profile to be driven by a single electron bunch and a train of periodic bunches, respectively. The radiation efficiency and the angular distribution of SPR with various bunch distribution functions are investigated. According to the analysis, the coherent emission will occur when electron bunches are short compared with the radiation wavelength, and the coherent emission strongly depends on the longitudinal distribution of bunches. Some numerical results for the sinusoidal grating are compared with those for echellette grating .The results show that the THz radiation will be obtained using the reasonable parameters for the bunches and the grating. The results provide a basis for designing a superradiant SP free-electron laser in the THz wavelength region.
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