自由电子激光中宽带相互作用的模型与模拟
Model and simulation of wide-band interaction in free-electron lasers
摘要：
提出了一种用于模拟自由电子激光（FEL）相互作用的三维空间频率模型。该模型利用的总电磁场（辐射和空间电荷波）的横向本征模的波导，在该字段被激发和传播方面的扩展。电子束和电磁场之间的相互作用完全描述的耦合方程，表达模式振幅和电子束动力学的演变。在此基础上，开发了颗粒模拟程序。一组耦合模激励方程，表示在频域中，求解自洽与粒子运动方程。采用变分数值方法模拟了后向模的激发。目前，该代码可以模拟自由电子激光在各种模式下的操作：自发（散粒噪声）和自放大自发发射（SASE），超辐射和受激发射，所有在非线性康普顿或拉曼制度。
英文摘要：
A three-dimensional, space-frequency model for simulation of interaction in free-electron lasers (FELs) is presented. The model utilizes an expansion of the total electromagnetic field (radiation and space-charge waves) in terms of transverse eigenmodes of the waveguide, in which the field is excited and propagates. The mutual interaction between the electron beam and the electromagnetic field is fully described by coupled equations, expressing the evolution of mode amplitudes and electron beam dynamics. Based on the three-dimensional model, a numerical particle simulation code was developed. A set of coupled-mode excitation equations, expressed in the frequency domain, are solved self-consistently with the equations of particles motion. Variational numerical methods were used to simulate excitation of backward modes. At present, the code can simulate free-electron lasers operation in various modes: spontaneous (shot-noise) and self-amplified spontaneous emission (SASE), super-radiance and stimulated emission, all in the non-linear Compton or Raman regimes.
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