摘要
利用微扰展开技术推导出变参数波振器的小信号增益两个近似求积表达式并将其计算结果与数值模拟结果进行了比较,二者吻合很好。利用近似解析式对小信号增益进行了初步探讨,得到了电子入射能量可低于初始谐振能,能散度允许范围受波振器设计影响以及降低锥度改变率可提高小信号增益等新结论。
Two approximate analytical expressions for small signal gain (S. S.G.) of variable parameter undulator Free Electron Laser (FEL) are obtained by disturbance method. The calculated results of them are in good agreement with those by numerical simulations. Based on those expressions, S.S.G. scalling laws of FEL with tapered undulator are derived and it is concluded that the injected energy of electron beam should be lower than that for the initial resonance .
出处
《强激光与粒子束》
EI
CAS
CSCD
1991年第1期12-22,共11页
High Power Laser and Particle Beams
关键词
变参数波振器
增益
自由电子激光
small signal gain, free electron laser , tappered undulator.
