同轴腔电子回旋微波激射器电子效率的研究  

Research of the Electron Efficiency for the Coaxial-Cavity Free-Electron Masers

作　　者：张辉波[1] 张世昌[1] 

机构地区：[1]西南交通大学光电子学研究所,四川成都610031

出　　处：《真空电子技术》2004年第1期12-14,共3页Vacuum Electronics

基　　金：国家自然科学基金(60071011);教育部科技研究重点项目(01150)

摘　　要：通过非线性模拟计算同轴腔电子回旋微波激射器的电子效率,结果与德国卡尔斯鲁研究中心研制的同轴腔电子回旋微波激射振荡器的实验效率比较吻合,进而通过提高初始横纵向速率比和引入坡度磁场,使器件的电子效率从26.7％提高到34.6％。这种效率放大的物理机制是:坡度磁场改变了相对论电子的运动条件,有效地改善了波束互作用过程中电子的群聚状态,从而提高了电子束的换能效率。The electronics efficiency of a coaxial-cavity free-electron maser is calculated through the nonlinear simulation. The result is in good agreement with experiments conducted by FZK. Furthermore, by increasing the initial transverse velocity to axial velocity ratio and employing a tapered magnetic field, the efficiency of the device might be enhanced from 26.7% to 34.6% . The mechanism of the efficiency enhancement is that the tapered magnetic field changes the condition of the electrons' motion, improves the bunching of the electrons in the interaction between the electron beam and the wave, so the efficiency of energy exchange is increased.

关 键 词：自由电子脉塞 回旋管 同轴腔 坡度磁场 效率 

分 类 号：TN128[电子电信—物理电子学]