中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50702-050702.doi: 10.1088/1674-1056/20/5/050702
孟现柱, 王明红, 任忠民
Meng Xian-Zhu(孟现柱)†,Wang Ming-Hong(王明红), and Ren Zhong-Min(任忠民)
摘要: A novel Smith–Purcell (S–P) free electron laser composed of an electron gun, a semi-elliptical resonator, a metallic reflecting grating and a collector, is presented for the first time. This paper studies the characteristics of this device by theoretical analysis and particle-in-cell simulation method. Results indicate that tunable coherent S–P radiation with a high output peak power at millimeter wavelengths can be generated by adjusting the length of the grating period, or adjusting the voltage of the electron beam. The present scheme has the following advantages: the semi-elliptical resonator can reflect all radiation with the emission angle θ and random azimuthal angles, back onto the electron beam with same-phase and causes the electrons to be modulated, so the output power and efficiency are improved.
中图分类号: (Infrared, submillimeter wave, microwave and radiowave instruments and equipment)