電磁波泵浦的自由電子激光器
A FREE ELECTRON LASER WITH ELECTROMAGNETIC PUMPING WAVE
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摘要: 本文研究了電磁波泵浦的自由電子激光器。從躍變磁場結構出來的大半徑迴旋環(huán)形電子束通過圓柱形波導與圓柱形波導的TE11模入射電磁波相作用。利用電子束的弗拉索夫分布函數(shù)理論和三維波導模的波動方程求得在康普頓區(qū)域中的散射波色散關系。通過數(shù)值分析,討論了軸向引導磁場,電子束能量,電子迴旋比和電子束環(huán)的徑向位置等與散射波頻率和增長率的關系。Abstract: A free electron laser with electromagnetic pumping wave is studied. A drifting and rotating electron ring with large radius comes from a magnetic cusp, goes through a cylindrical waveguide and interacts with TEn modes of the waveguide. By making use of the Vlasov distribution theory and the three dimensional wave equation of waveguide modes, the dispersion relation of scattered waves in Compton region is deduced. According to the numerical analysis, the growth rate and frequency of scattered wave as a function of guide mag netic field, electron beam energy. electron cvclotron ratio and radial position of electron ring have been discussed.
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