椭圆偏振自由电子激光的模型
Modelling elliptically polarised Free Electron Lasers
摘要：
本文提出了一种椭圆偏振波荡器工作的自由电子激光模型。方程描述的自由电子激光相互作用，包括谐振谐波辐射场，平均超过波荡器周期，并产生一个广义贝塞尔函数的比例因子，类似于平面波荡器自由电子激光理论。平均模型与非平均模型的模拟之间的比较显示出非常好的协议在线性政权。发现了两个意想不到的结果：第一，椭圆偏振波荡器比平面偏振波荡器对谐波的耦合增加。其次，被认为是无关的波荡器偏振，一个显着不同的演化之间的平均和非平均模拟的谐波辐射演化接近自由电子激光饱和。
英文摘要：
A model of a Free Electron Laser operating with an elliptically polarised undulator is presented. The equations describing the FEL interaction, including resonant harmonic radiation fields, are averaged over an undulator period and generate a generalised Bessel function scaling factor, similar to that of planar undulator FEL theory. Comparison between simulations of the averaged model with those of an unaveraged model show very good agreement in the linear regime. Two unexpected results were found. Firstly, an increased coupling to harmonics for elliptical rather than planar polarisarised undulators. Secondly, and thought to be unrelated to the undulator polarisation, a signficantly different evolution between the averaged and unaveraged simulations of the harmonic radiation evolution approaching FEL saturation.
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