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波荡器是基于自由电子激光的小型THz源关键器件,其可调节的周期性磁场结构与两端的光腔配合,使得穿越的电子束产生带增益的相干辐射,最终达到THz源所需要的功率.同纯永磁结构相比,混合型波荡器通过软铁材料调节由永磁块磁化方向性差异导致的磁场分布误差,同时可提供更高的场强.本文针对小型THz源需求,对混合型波荡器进行了相关物理设计.在解析方法分析的基础上,采用OPERA3D/TOSCA有限元分析软件,对波荡器进行了三维磁场数值模拟和积分场优化.通过对波荡器端部结构的调整,优化后模型的一次场积分(导向误差)小于0.01Gs·m,电子轨迹偏移小于0.02mm.
Oscillators are small, THz-source devices based on free-electron lasers whose tunable periodic magnetic field structures mate with the optical cavities at both ends so that the traversing electron beam produces coherent radiation with gain that eventually reaches the power required by the THz source. Compared with the pure permanent magnet structure, the hybrid undulator adjusts the magnetic field distribution errors caused by the difference of the magnetization direction of the permanent magnet blocks by the soft iron material, and at the same time can provide higher field strength.This paper aims at the demand of small THz source, Based on the analytical method, the Oscillator was simulated by three-dimensional magnetic field and the integral field was optimized by OPERA3D / TOSCA finite element analysis software. By adjusting the end structure of the undulator, The time integral (guidance error) of the last model is less than 0.01Gs · m and the electron trajectory deviation is less than 0.02mm.