大连相干光源的FEL偏振控制研究
FEL Polarization Control Studies on Dalian Coherent Light Source
摘要：
自由电子激光（FEL）的偏振开关对用户科学界具有重要意义。本文研究了大连相干光源中两种常用的可控偏振自由电子激光的产生方法，交叉平面波荡器和椭圆形永久波荡器。为了进行公平的比较研究，一维时间相关的自由电子激光程序已经开发，其中考虑了椭圆形永久波荡器的缺陷效应。综合模拟结果表明，剩余光束能量啁啾和本征自由电子激光增益可能是导致交叉平面波荡器偏振性能下降的原因。椭圆形永久波荡器对波荡器误差和光束缺陷不太敏感。同时，通过适当的主平面波荡器和附加的椭圆永久波荡器结构，在大连相干光源上实现了脉冲能量超过100 $μ$ J的圆偏振自由电子激光。
英文摘要：
The polarization switch of a free-electron laser (FEL) is of great importance to the user scientific community. In this paper, we investigate the generation of controllable polarization FEL from two well-known approaches for Dalian coherent light source, i.e., crossed planar undulator and elliptical permanent undulator. In order to perform a fair comparative study, a one-dimensional time-dependent FEL code has been developed, in which the imperfection effects of an elliptical permanent undulator are taken into account. Comprehensive simulation results indicate that the residual beam energy chirp and the intrinsic FEL gain may contribute to the degradation of the polarization performance for the crossed planar undulator. And the elliptical permanent undulator is not very sensitive to the undulator errors and beam imperfections. Meanwhile, with proper configurations of the main planar undulators and additional elliptical permanent undulator section, circular polarized FEL with pulse energy exceeds 100 $μ$J could be achieved at Dalian coherent light source.
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